Gurty

[cuti3moto]

 

The urban dictionary defines Gurty as “something that looks so wrong it's right.”

I need a bike to go back for TT23.

 

This is my how-to guide.

Let me know if you can prove this is your bike.

I have a gift for you.

 

 

This is Gurty.

Or, should I say, this is the early stages of Gurty being re-born.

 

 

I’ve just contacted the seller about a shipping rate for this turbo.

 

I’ve just ordered these throttle bodies.

I’ve also just ordered a thirty-litre sonic cleaner.

Safe to say that Gurty will be ugly, but interesting.

C3M.

 

[cuti3moto]

Recent progress on Gurty has been incremental.

After finally getting the shipping sorted out, my whee-bang! showed up.

I’ve eyeballed it in relation to the frame – packaging will be tight, but do-able.

 

My throttle bodies and secondary injectors showed up – packaging for them in the available space will also be tight, but do-able.

 

The shippers didn’t put the foil tape on either of these items.

I did that to keep cosmic debris out of the delicate bits.

Once bitten, twice shy.

 

The main frame down-tube is finished to my satisfaction – it looks simple, but took a little bit of getting right.

 

The main swingarm is… well, it’s not exactly done, but I’m satisfied that the design in my head can actually exist in the so-called real world.

It’s not a hundred percent perfect, but it meets my original use-case requirements of 300 millimetres of wheel travel with minimal variation on chain tension.

 

It also has adjustability, because it’s still required.

I could probably get it better, but I’ve tried literally hundreds of different configurations on my test mule, and this is about the best I’ve been able to achieve.

Why 300 mil?

Reasons.

 

Now it’s just a case of making it in steel, and running it past my tame engineer for his critique and blessing.

Once he’s happy, I’ll re-make it in black steel tube using a jig.

Now I know most of the dimensions, I just have to make sure the orientation is right and hold it steady while I tack and weld it together.

 

This will be my hold-point – if I think I have enough time, I’ll re-make the final version in a much lighter and stronger material.

If not, I’ll happily run the tube frame for the TT trip – it will be a great way to get some field testing under my belt.

Either way, the engineer can then inspect and certify the final version so I can get a unique frame number issued and get Gurty registered.

 

The next tricky part is to get the rear suspension design right – I’ve just ordered two cheap shocks to use in the mock-up.

I’m striving for a progressive action based on a structure which is as light and strong as it can be, while still being useable.

Design is one component of that strategy, material is the other.

Once I get the design right, we can play with materials.

 

While I’m still fascinated by carbon fiber, I’ve gone away from using it.

It strikes me as something that takes a lot of practice to get right – time which I don’t really have for this job.

It also strikes me as something that you really need to be set up for – I don’t have the space or the tooling just now.

So, I’ll be sticking with metals I can cut, shape, and weld – which pretty much means aluminium or titanium for this application.

 

Aluminium makes more sense from a cost perspective, but money is a great measure of scarcity and a shitty measure of value.

While every project is subject to budgetary constraints, I’m striving to make a statement beyond the decrepit reach of capital.

So, I’m leaning more towards titanium for the final construction, but am well aware that this means more complexity in terms of fabrication.

 

I’ve been schooling myself in this regard, and, as far as I can tell, it comes down to three things: precise joint fitment, extremely hygienic preparation of the pieces to be welded, and thorough shielding of the weld pool and heat affected zone.

 

The process I’m describing here is intended to address the first point.

The other two I will tool up for, and address through practice.

C3M.

[Gerontious]

Fascinating.  while reading this I was torn. should I make a coffee, or just grab some filtered water.

luckily this was decided when I remembered I had a brand spanking new pack of chocolate coated oat biscuits. so that helped make my day complete. I had two as my diet is ongoing and im in no rush to change trouser sizes, it is only Monday after all.. and there's a whole week to get through and although its payday on Thursday I have to choose between trousers or a new winter coat.

 

its not easy.

[bud]

Very interesting build you have going on.

[Turbodave]

The most Gurty motorcycle in history,in my opinion, is the Britten V1000 ,looked wrong but was so right.

Wasn't able to attach a photo so y'all will have to Google it.

Best of luck with the build Cuti!

[Bender]

2 hours ago, Turbodave said:

The most Gurty motorcycle in history,in my opinion, is the Britten V1000 ,looked wrong but was so right.

Wasn't able to attach a photo so y'all will have to Google it.

Best of luck with the build Cuti!

Like this one 

 

[cuti3moto]

"Fascinating."  Thanks mate - good to know you're keeping an interest.

"while reading this I was torn. should I make a coffee, or just grab some filtered water." I don't normally provide spiritual advice, but you asked. Coffee.

"luckily this was decided when I remembered I had a brand spanking new pack of chocolate coated oat biscuits. so that helped make my day complete." You'll have to excuse me - I'm thicker than a whale milk omlette. Do the choccy biccies mean you went for coffee, or water?

"I had two as my diet is ongoing and im in no rush to change trouser sizes, it is only Monday after all.." My doctor, a tiny little sparrow-woman, is also yelling at me for having bad cholesterol, so I have been forced to divorce chocolate, alcohol, most red meat, and fun from my life. The good news is I'm not likely to die young from a stroke now, and I have visible abs again.

"and there's a whole week to get through and although its payday on Thursday I have to choose between trousers or a new winter coat." No contest - new coat every time. You can always go without pants. In other news, do not try this in public, or you will end up on a list.

"its not easy." Nothing good is.

 

"Very interesting build you have going on." Thanks mate - it's good to know people are interested. 

 

"The most Gurty motorcycle in history,in my opinion, is the Britten V1000 ,looked wrong but was so right." Pretty hard to argue with that. I have vague project ambitions of doing a Britten copyplica based on an Aprilia engine. If I had the budget, I'd have a go at my own engine too. After all, how hard can it be? (Don't answer that - it's a rhetorical question).

"Wasn't able to attach a photo so y'all will have to Google it." There are a few on my website - here, here, and here.

"Best of luck with the build Cuti!" Thanks very much mate. I have included a brief update below.

 

Time for a quick update.

Thanks to help from various agencies and individuals, we were able to organise mum’s funeral before Christmas. I also managed to get through the eulogy mostly intact. Mostly. It’s funny – the amount of stuff you don’t know about someone you’ve known all your life is quite astounding. The realisation that none of us are perfect, and that we all have inherent flaws and fundamental shortcomings also hits hard.

The good news is that dad is doing okay, all things considered. He’s making plans for the future, and is taking action to bring them to fruition. He has a sale contract on his current place, and has been getting rid of excess clutter in preparation for living a more streamlined lifestyle. This evolution is not without challenges. I spent an hour on the phone yesterday day trying to convince him of the importance of being able to do basic personal admin (e.g. email and banking etc.) online. That conversation somehow ended up focused on how cheque banking is kind-of, but not-really still a thing, which should provide some indication of how long its been since he’s had to do this for himself. Still, we all face little hurdles in life, and none of ours are insurmountable.

Next, the TT23 trip and the land-speed record attempts have both successfully been deferred until next year. So Violatrix is back on the road, and Gurty is back on the bench in preparation for a Simpson Desert crossing in August-September this year (i.e. SD23). I also have a firm plan and budget for the big-wheelie ‘busa, which will be talked about more in forthcoming content. I’ve recently changed my employment circumstances to give me greater freedom and budget to complete these projects, but I will have less time to do the work. It’s a compromise I’m willing to live with in the short-term, as I am serving a revised long-term plan. It’s all about having more time, money, and inclination to do big bike projects and trips.

With regards to Gurty, it’s taken me a while to get my head back in the game, but I have been doing bits and pieces where I can. This has included rechecking all my design assumptions and calculations to make sure I’m happy with them. I went to the extent of making a 1:1 scale mock-up of the frame and swingarm, and testing it to make sure I can get the suspension travel combined with 100% anti-squat through the full range of movement (i.e. 300mm), all with minimal variation in chain tension. I was able to achieve the first two, and an acceptable compromise on the third. All engineering is compromise, so I can live with that. The frame design has evolved to accommodate the swingarm pivot configuration necessary to achieve the desired suspension performance, but that has actually made my life simpler in lots of ways. The front-end design is a lot simpler, and achieves the required suspension performance with minimal fuss. It definitely looks weird though, which highlights the variable importance of form versus function.

As of today, I’m about 75% complete on a 1:1 scale cardboard model of the whole thing that I can video in order to explain what the hell I’m talking about. Me no wordy so good. I’m also planning to get the materials necessary to make a frame jig so I can mock the whole thing up in plastic/PVC, including the bearings and fixings etc. I’m intending to use. This will be used to get feedback from my tame engineer – once he’s happy, I’ll move on to making the first frame out of Chromoly tube, round bar, and plate. I’ve found a local supplier who can deliver at reasonable prices. Moreover, I can bronze weld the frame to minimise heat distortion while maximising durability in both design and function. The titanium frame is still on the agenda, but it will be the second, or possible third iteration. I really want to get some field testing under my belt before I commit to the expense and complexity of building a titanium frame. Hence the SD23 trip.

Taking the turbo requirement into account, I’ve completed the build budget and schedule. In light of my work changes, the timeline is tight, but do-able. Isn’t it always? At this stage, the plan is to have the frame and engine ready for dyno testing late June, or early July this year. That’s four to five months away. For me, that’s 4-5 weeks of actual work time. Hardly a challenge.

I’m also in the process of revising and simplifying my website in particular, and my social media presence in general.

Cheers,

C3M.

[cuti3moto]

I did a thing.
Gurty suspension movement mock-up - designed with 300mm front and rear, minimal change in chain tension, and anti-squat characteristics through the full range of motion.
https://youtu.be/_IzES1fKpWI

[cuti3moto]

Time for a quick update.

 

I spent some of my available time this week building a frame jig. As mentioned previously, the intention is to use it to make a PVC tube mock-up of the cardboard frame design. From there, the plan is to show it to my tame engineer to see what he reckons. Then I can listen to his recommendations and certification requirements, and build any required changes into the design before starting to make things in ChroMo.

 

Well, that was the plan. Things went wrong when I downloaded the free jig blueprints – the designer’s brief specified 50 x 50 mm box for the main frame, but didn’t mention a thickness. Keen to get started, I raced out and brought the closest suitable steel could find, which turned out to be 50 x 50 x 1.6 mm galvanised tube. I had some old welding rods in stock at home, so elected to stick weld the thing together instead of TIGing it – stick being much quicker in this application.

 

Anyway, problems were immediately obvious. Gal steel is a pain in the spadgebox to weld, not to mention that the fumes contain lead oxide, which can cause brain cancer and nervous system disorders. I took this into account, and set up a suitable ventilation system prior to starting (check your material safety data sheets kids!). Didn’t matter – it turns out that this steel is far too thin for this application. Despite being clamped and gradually tacked, it moved about a lot during welding. The end result was not as square as I would have liked, and flexed a lot once I’d finished – too much for what I want it for. Also, the combination of old rods, gal coating, and my muppet welding skills meant that the final result ended up looking like arse. I consider the time and money spent on this to be dickhead tax, and will incorporate the lessons learnt into the next version. I’ll make it using heavier material (which I’ve sourced), and will add triangulation to the original design to get rid of any potential for flex.

 

I’ve also spent some time developing a project budget. In my experience, failing to plan is planning to fail. Also, plans are redundant, but planning is essential – meaning that no plan survives first contact with reality, but considering the what-ifs before starting is a healthy survival strategy. As of today, I reckon that I know where to get about 80% of the parts and material I need for Gurty, and am in a position to start buying bits as my cash flow permits. Two thoughts here – it’s advantageous to base projects on popular/raced engines, as the OEM and after-market parts supply options are much better. For example, the engine in Gurty is thirty years old this year, and I don’t have any real problem buying the OEM parts I need. I do have to shop around, but they are there. There are also many after-market options available for parts and tuning that make my life just a little bit easier in terms of building and tuning for bigly power.

 

Of course, only time will tell whether the things I can see online can actually be brought and delivered in time. I was torpedoed by this recently when buying tools. I found an online supplier with the things I wanted showing as being in stock, and placed my order. Then waited for delivery. And waited. And waited some more. After reaching out, I was informed that supply was not currently available for all the things I ordered. To which I responded that those things were still showing as stock items on the vendor’s website, and that I’d like a refund. I got my coin back nearly two months later, but what a ball-ache. This brings me to my second point – things almost never, ever go strictly according to plan. Keeping an eye on my project time/cost/quality constraints, and having a plan to mitigate any risk, gives me the best chance of success.

 

Concurrently, I’ve also done up my budgets for the big wheelie bike, and the two land-speed record (LSR) bikes. Speed Week 2023 starts today at Lake Gairdner, but I obviously won’t be making it given that I’m, typing this from my home office 2,200 km away. However, I have a cunning plan – I’m about 75% on the budgets for these bikes (the remaining 25% is comprised by the unknowns inherent to building a frame from the ground up, and from boosting the engines), and I’m still working on building them. Moreover, I’ve found a place where I can test to my heart’s content without breaking the law or upsetting anyone. The use case for Gurty is pretty simple, and relatively easy to both test and verify. I won’t spoil the story by getting into specifics of that mission just yet, but it simply involves getting from A to B. The mission for the big wheelie bike and the LSR bikes is more complex, and is much harder to both test and verify. Given their intended purpose, the LSR bikes, in particular, are quite difficult to test in anything other than real-world conditions. There are two wind tunnels within 200 km of me – as far as I can tell, neither of them are available for anything other than research and teaching purposes, so my chances of getting access to them are slim. More to the point, it’s debatable as to whether or not such testing would be of any value. So, real-world testing is the only way forward. And I’ve found the place to do it. More on that later.

 

You may recall that TT24 is back on the agenda. Two updates need to be discussed here. First, my shipper is offering to send my bike to Barcelona in early May-2024, as opposed to sending it straight to the UK. Considering that we originally intended to travel in such a way as to meet up as a family at certain places (i.e. Mrs Wife and kidlets would fly, and I’d ride and meet them), this raises obvious questions around the overall trip plan. I’m still in discussion with Mrs Wife on this one – no doubt she’ll tell me what I think in due course. Right now, my thinking is to take a longer trip, see more of Europe, and take in some of the Irish road racing before heading over to the Isle of Man for the TT. I’ve done this before, and can highly recommend it. It’ll probably cost me some family bribery, but I reckon I can get this approved. The second update is that the accommodation I had for this year was rolled over to 2024. Unfortunately, the owners of the venue had had some family strife, and it is no longer available. I’ve rolled my deposit over to secure whatever digs become available, and don’t anticipate not having a place to stay. Still, even this far out, I’m slightly nervous about not having my TT24 accommodation locked in. Also, Steam Packet ferry tickets for 2024 went on sale on 6^th of Mar-2023, so if you want to go, you better get in quick. This is relevant because, based on previous experience, coming to the Isle of Man from the mainland UK via Ireland can be easier than coming direct from the UK mainland. Something to think about.

 

I had some reader questions from the last update which I’d like to address. First one – why do I need so much suspension travel? Well, I’ll be taking Gurty places where more suspension will be better than less. I chose 300 mm as the arbitrary target for two reasons – it’s more than any stock motorbike I could find/buy, and I wanted to see if I could do it. Second question – why stuff around so much to get the anti-squat and zero chain slack? Well, as per Foale’s comments, the bigger the suspension movement, the bigger the effect that suspension movement has on anti-squat performance and chain slack. So, I had to take this into consideration in my design from the outset. Just copying an existing design would not achieve the benefits I’m looking for, and would likely incur more problems if I just tried forcing more suspension movement into it.

 

Third question – what will performance of the leading link front suspension be like? Well, in this design, function has determined form. I need the chassis to be light, strong, simple, and able to accommodate the required engine package and suspension movement. Reading Foale’s book led me to the decision that the leading link would be the way to go for the front suspension. I did consider a trailing link setup for some time, but it ended up looking too hard to package it neatly and still be able to maintain the OEM wheel base and engine/radiator position. All design is compromise. The cardboard mock-up video shows that it is at least feasible – I have lingering concerns regarding the strength and rigidity of the leading link, but, so far at least, the idea is do-able.

 

Further explanation probably requires that you read Foale’s book, as he explains it much better than I can. However, he does note that having the forks attached to the steering stem (as I do) means that braking and suspension forces still go through it. This means that it has to be strong, and likely heavier than alternative designs as a result (as my design probably is). I can live with over-engineering, but I can’t live with a premature failure of a flawed or weak design. It’s also the simplest design combination that I could see, but I’m happy to be proven wrong on that. Foale also talks about the potential benefits of leading links, including much better rigidity, stability, and control than standard forks. Anti-dive can (and will) be built in, and stiction performance is generally better than forks in his estimation. Foale does mention that leading links are generally not ideal where large suspension movements are required due to the larder range of motion of the axle with respect to the link pivot (i.e. the axle moves in a semi-circular arc, not a straight line), but I suspect that this won’t be a major concern considering where I want to take this thing. Foale also talks about the effect that link length can have on angular suspension movement – the shorter the links, the greater the movement, and the less anti-dive effect which can be achieved. I did consider this, and tried to keep the link as long as possible while still keeping it packed in the required space and giving the required suspension movement. Once again, everything is a compromise, and I’m prepared to live with a bit less anti-dive.

 

Fourth question – how do I understand Foale’s calculations? Well, the short answer is that I don’t – I didn’t even try, because I’m a certified turnip. Instead, I started with the design brief (i.e. 300mm wheel travel front and rear). Next, I decided to try for anti-squat and zero effect on chain slack throughout that range – just because I could. As noted above, I looked at designs that could feasibly achieve this, then looked around for suspension units that I could buy which would let me achieve this range of movement. Once I had all this, I started drawing various designs – lots and lots of drawings. This evolved into cardboard models, and culminated with the video you saw last time. In short, I didn’t have to understand the maths – I just had to know it works. I did this via the video, and will try to validate it with a physical 3D model next. I could try modelling it in some sort of software, but that seems like an extra step – I’m unlikely to learn any more about the design my modelling the thing virtually than I would be actually cutting bits up and gluing them together. Besides, I’m not competent with any of these software packages, and don’t have the time to gain those skills. I can lean on my engineer for finite element analysis when the time comes, so this is the path of least resistance for me.

 

Apologies if I’ve forgotten any questions. Hit me up, and I’ll answer them next time.

 

C3M.

[cuti3moto]

Time for a quick update.

 

I spent some of my available time this week building a frame jig. As mentioned previously, the intention is to use it to make a PVC tube mock-up of the cardboard frame design. From there, the plan is to show it to my tame engineer to see what he reckons. Then I can listen to his recommendations and certification requirements, and build any required changes into the design before starting to make things in ChroMo.

 

Well, that was the plan. Things went wrong when I downloaded the free jig blueprints – the designer’s brief specified 50 x 50 mm box for the main frame, but didn’t mention a thickness. Keen to get started, I raced out and brought the closest suitable steel could find, which turned out to be 50 x 50 x 1.6 mm galvanised tube. I had some old welding rods in stock at home, so elected to stick weld the thing together instead of TIGing it – stick being much quicker in this application.

 

Anyway, problems were immediately obvious. Gal steel is a pain in the spadgebox to weld, not to mention that the fumes contain lead oxide, which can cause brain cancer and nervous system disorders. I took this into account, and set up a suitable ventilation system prior to starting (check your material safety data sheets kids!). Didn’t matter – it turns out that this steel is far too thin for this application. Despite being clamped and gradually tacked, it moved about a lot during welding. The end result was not as square as I would have liked, and flexed a lot once I’d finished – too much for what I want it for. Also, the combination of old rods, gal coating, and my muppet welding skills meant that the final result ended up looking like arse. I consider the time and money spent on this to be dickhead tax, and will incorporate the lessons learnt into the next version. I’ll make it using heavier material (which I’ve sourced), and will add triangulation to the original design to get rid of any potential for flex.

 

I’ve also spent some time developing a project budget. In my experience, failing to plan is planning to fail. Also, plans are redundant, but planning is essential – meaning that no plan survives first contact with reality, but considering the what-ifs before starting is a healthy survival strategy. As of today, I reckon that I know where to get about 80% of the parts and material I need for Gurty, and am in a position to start buying bits as my cash flow permits. Two thoughts here – it’s advantageous to base projects on popular/raced engines, as the OEM and after-market parts supply options are much better. For example, the engine in Gurty is thirty years old this year, and I don’t have any real problem buying the OEM parts I need. I do have to shop around, but they are there. There are also many after-market options available for parts and tuning that make my life just a little bit easier in terms of building and tuning for bigly power.

 

Of course, only time will tell whether the things I can see online can actually be brought and delivered in time. I was torpedoed by this recently when buying tools. I found an online supplier with the things I wanted showing as being in stock, and placed my order. Then waited for delivery. And waited. And waited some more. After reaching out, I was informed that supply was not currently available for all the things I ordered. To which I responded that those things were still showing as stock items on the vendor’s website, and that I’d like a refund. I got my coin back nearly two months later, but what a ball-ache. This brings me to my second point – things almost never, ever go strictly according to plan. Keeping an eye on my project time/cost/quality constraints, and having a plan to mitigate any risk, gives me the best chance of success.

 

Concurrently, I’ve also done up my budgets for the big wheelie bike, and the two land-speed record (LSR) bikes. Speed Week 2023 starts today at Lake Gairdner, but I obviously won’t be making it given that I’m, typing this from my home office 2,200 km away. However, I have a cunning plan – I’m about 75% on the budgets for these bikes (the remaining 25% is comprised by the unknowns inherent to building a frame from the ground up, and from boosting the engines), and I’m still working on building them. Moreover, I’ve found a place where I can test to my heart’s content without breaking the law or upsetting anyone. The use case for Gurty is pretty simple, and relatively easy to both test and verify. I won’t spoil the story by getting into specifics of that mission just yet, but it simply involves getting from A to B. The mission for the big wheelie bike and the LSR bikes is more complex, and is much harder to both test and verify. Given their intended purpose, the LSR bikes, in particular, are quite difficult to test in anything other than real-world conditions. There are two wind tunnels within 200 km of me – as far as I can tell, neither of them are available for anything other than research and teaching purposes, so my chances of getting access to them are slim. More to the point, it’s debatable as to whether or not such testing would be of any value. So, real-world testing is the only way forward. And I’ve found the place to do it. More on that later.

 

You may recall that TT24 is back on the agenda. Two updates need to be discussed here. First, my shipper is offering to send my bike to Barcelona in early May-2024, as opposed to sending it straight to the UK. Considering that we originally intended to travel in such a way as to meet up as a family at certain places (i.e. Mrs Wife and kidlets would fly, and I’d ride and meet them), this raises obvious questions around the overall trip plan. I’m still in discussion with Mrs Wife on this one – no doubt she’ll tell me what I think in due course. Right now, my thinking is to take a longer trip, see more of Europe, and take in some of the Irish road racing before heading over to the Isle of Man for the TT. I’ve done this before, and can highly recommend it. It’ll probably cost me some family bribery, but I reckon I can get this approved. The second update is that the accommodation I had for this year was rolled over to 2024. Unfortunately, the owners of the venue had had some family strife, and it is no longer available. I’ve rolled my deposit over to secure whatever digs become available, and don’t anticipate not having a place to stay. Still, even this far out, I’m slightly nervous about not having my TT24 accommodation locked in. Also, Steam Packet ferry tickets for 2024 went on sale on 6^th of Mar-2023, so if you want to go, you better get in quick. This is relevant because, based on previous experience, coming to the Isle of Man from the mainland UK via Ireland can be easier than coming direct from the UK mainland. Something to think about.

 

I had some reader questions from the last update which I’d like to address. First one – why do I need so much suspension travel? Well, I’ll be taking Gurty places where more suspension will be better than less. I chose 300 mm as the arbitrary target for two reasons – it’s more than any stock motorbike I could find/buy, and I wanted to see if I could do it. Second question – why stuff around so much to get the anti-squat and zero chain slack? Well, as per Foale’s comments, the bigger the suspension movement, the bigger the effect that suspension movement has on anti-squat performance and chain slack. So, I had to take this into consideration in my design from the outset. Just copying an existing design would not achieve the benefits I’m looking for, and would likely incur more problems if I just tried forcing more suspension movement into it.

 

Third question – what will performance of the leading link front suspension be like? Well, in this design, function has determined form. I need the chassis to be light, strong, simple, and able to accommodate the required engine package and suspension movement. Reading Foale’s book led me to the decision that the leading link would be the way to go for the front suspension. I did consider a trailing link setup for some time, but it ended up looking too hard to package it neatly and still be able to maintain the OEM wheel base and engine/radiator position. All design is compromise. The cardboard mock-up video shows that it is at least feasible – I have lingering concerns regarding the strength and rigidity of the leading link, but, so far at least, the idea is do-able.

 

Further explanation probably requires that you read Foale’s book, as he explains it much better than I can. However, he does note that having the forks attached to the steering stem (as I do) means that braking and suspension forces still go through it. This means that it has to be strong, and likely heavier than alternative designs as a result (as my design probably is). I can live with over-engineering, but I can’t live with a premature failure of a flawed or weak design. It’s also the simplest design combination that I could see, but I’m happy to be proven wrong on that. Foale also talks about the potential benefits of leading links, including much better rigidity, stability, and control than standard forks. Anti-dive can (and will) be built in, and stiction performance is generally better than forks in his estimation. Foale does mention that leading links are generally not ideal where large suspension movements are required due to the larder range of motion of the axle with respect to the link pivot (i.e. the axle moves in a semi-circular arc, not a straight line), but I suspect that this won’t be a major concern considering where I want to take this thing. Foale also talks about the effect that link length can have on angular suspension movement – the shorter the links, the greater the movement, and the less anti-dive effect which can be achieved. I did consider this, and tried to keep the link as long as possible while still keeping it packed in the required space and giving the required suspension movement. Once again, everything is a compromise, and I’m prepared to live with a bit less anti-dive.

 

Fourth question – how do I understand Foale’s calculations? Well, the short answer is that I don’t – I didn’t even try, because I’m a certified turnip. Instead, I started with the design brief (i.e. 300mm wheel travel front and rear). Next, I decided to try for anti-squat and zero effect on chain slack throughout that range – just because I could. As noted above, I looked at designs that could feasibly achieve this, then looked around for suspension units that I could buy which would let me achieve this range of movement. Once I had all this, I started drawing various designs – lots and lots of drawings. This evolved into cardboard models, and culminated with the video you saw last time. In short, I didn’t have to understand the maths – I just had to know it works. I did this via the video, and will try to validate it with a physical 3D model next. I could try modelling it in some sort of software, but that seems like an extra step – I’m unlikely to learn any more about the design my modelling the thing virtually than I would be actually cutting bits up and gluing them together. Besides, I’m not competent with any of these software packages, and don’t have the time to gain those skills. I can lean on my engineer for finite element analysis when the time comes, so this is the path of least resistance for me.

 

Apologies if I’ve forgotten any questions. Hit me up, and I’ll answer them next time.

 

C3M.

[cuti3moto]

Update time.

Apologies for skipping my last update. Just before my last break, I somehow slept wrong, and pinched a nerve in my neck. This is my life now – debilitating injuries from wonky nighty-nights. Hurt like a… well, it hurt a lot – too much to even think about mowing the lawn, let alone getting busy in the shed. Wouldn’t have made any difference anyway – I was busy doing family stuff that week, and didn’t have a lot of tool-time.

I got back to town this break to the shocking news that Quicky from the Quick Bikes channel on YouTube had passed away. I found out first from Matt on Dirty Garage Guy, and Craig over at Doghouse Customs confirmed it when I caught up with his videos later on. I didn’t know the bloke, but I learnt a lot from watching him work – his fabrication and machining skills were far better than mine, and I was really looking forward to seeing Gixit finished. He seemed like a good egg, and I’m sure the world is poorer for his passing. Commiserations must go out to his friends and family – he was obviously a solid family man.

This has motivated me to start recording and posting more of my work online – you never know who it might help out.

In the meantime, the two shocks I ordered have shown up – they’re a bit ratty, but good enough to validate suitability for the task. Refurbishing them for final use shouldn’t be a huge challenge – I’ve verified that all the required parts are available, and as previously mentioned, I intend to build a blast cabinet to allow me to clean everything up prior to final prep/assembly. It’s on my list of things to do – honest.

I also ordered, and received the heavier steel for the frame jig (the old steel got repurposed into a new cover for our pool filter), and have started measuring bits up. I also showed our eldest how to TIG weld, so that’s something. Credit where its due – I’m using a set of free plans (https://renewablesystemstechnology.com/project-blog/building-a-rotating-motorcycle-chassis-jig) made available by a bloke called James Biggar on his very interesting YouTube channel (https://www.youtube.com/watch?v=GpONBdvucc8). The plan now is to order some trapezoidal threaded rod for the head stock, and get the whole thing ready to go – including some modifications to suite my circumstances and requirements.

From there, I already have a supply of PVC tube on hand ready to start the next mock-up of the frame. I’ve also been thinking about how to approach the engine rebuild – I know what parts I want, and where to get them. Putting it all together will be as easy or as hard as I make it. First order of business is to get a manual, and read through it to understand the order of operations. I already have a Clymer book of words, and a PDF copy of the OEM manual to compare it against. Then I need to make a frame to allow me to actually work on the thing – from both top and bottom. I have already had a go at building an engine stand – it didn’t work as well as intended, and I need to do better, especially when I consider that I have a few different styles of engine to rebuild. When ordering the steel for the frame jig, it occurred to me that I could, and probably should, use the rotary head of the jig to help spin the engine to allow access to both the crank and head/top end without having to lift the engine by hand every time.

I have a frame that allows me to lift complete engines and bikes if required, but it’s still a mission to shuffle things around in my limited space without doing some manual handling. I’d much rather spend my time on productive things than lugging big heavy things around – this includes Gurty’s engine. I’ll have to put some more thought into that over the next couple of weeks.

In other news, I received a newsletter from the Dry Lake Racers Association around ten days ago. The 2023 event started on the 10^th of March, and was scheduled to run for five days. Unfortunately, bad weather meant that they only got 2.5 days of actual racing in – the rest was either washed out, or waiting around to see what the weather would do. There’s always next year, I guess, but I’m glad I didn’t drive two days straight to not even qualify, or get a run in. Credit to the organisers who make that event happen every year – they’re mostly volunteers, and without their love of, and dedication to the sport, it just wouldn’t happen here.

Outside of that, I only have two breaks left before the mid-year school holidays. I’m taking two weeks off with the fam to go on a 6,000 kilometer walkabout, including a trip to my friendly dyno shop. Problem is that I won’t have Gurty ready for that trip, and work-related stuff (not to mention the unseasonally wet weather) is putting the September desert trip in some jeopardy as well. In light of the fact that I need Gurty ready for the TT trip next year, I may be forced to reschedule some of these minor trips.

Sorry – no photos or video for this one, as I’m in a rush getting this out before I have to leave again.

C3M.

[cuti3moto]

Time for a quick update.

I’ve been a bit quiet recently due to having to take the time to deal with unforeseen issues.

To explain that comment, some background is required.

 

I finished my trade last century, and have worked a succession of more senior roles over the years, eventually ending up in corporate project management.

Mid-2022 found me growing increasingly disillusioned with corporate hyperbole (a twenty-dollar word for bullshite).

The bigger the organisation, the more time spent telling you not only how to think, but also what to think.

Challenging the corporate narrative is verboten.

Critical thought is killed by group-think.

Innovation is starved by desperation.

It seemed that way to me anyway.

So, in my late forties, I went back on the spanners.

Pretty good decision, hey?

 

On the up-side, it was quite refreshing to not be responsible for others for the first time in a long time.

It was also gratifying to prove to myself that I could still cut it on the tools.

Getting paid big bucks for working less than six months of the year also helped.

 

But, I’m not gonna lie – there were challenges.

Physically, the first couple of weeks really hurt.

I had to resort to dropping Advil (Ibuprofen, or Ranger Candy for you ‘merkins) a couple of times.

It took my shiny-arse (office worker) body a little while to catch up.

It turns out that although trade skills are perishable, it is like riding a bike – practice (and learning from mistakes) makes perfect.

Since I’m in a position to critique by way of experience and education, in my estimation, trade skills are generally declining, and leadership is generally poor.

I can illustrate this point by way of an example.

 

One day, a was working with a young fella (a relative newb) on a job.

He was using an air tool, and was holding it up in front of his face to access the work area.

He was right beside me when the air line blew off the fitting on the tool.

I saw it whip past his face – luckily it didn’t hit him, or me.

I told him straight away that he needed to report the incident to the supervisor, which he did.

About five minutes later he came back out saying the supervisor told him not to worry about it.

I saw red over this, and went to confront the supervisor.

He made a comment to the effect that no-one was hurt, so it didn’t need to be reported.

I made a comment to the effect that if he didn’t understand the difference between an incident (something unforeseen happens, but nothing goes wrong), an accident (something unforeseen happens and something goes wrong), and the obligation to report both, then he shouldn’t be a supervisor.

Yes, I know, I know – way to make friends and influence people.

But, I was right – the example of this supervisor is symptomatic of generally weak leadership.

 

After about eight months I had an epiphany in the middle of one night-shift – the fact that this problem exists means one (or more) of three things.

1)     Industry is unaware of the problem

2)     Industry is aware of the problem, but unable to do anything about it

3)     Industry is aware of the problem, but unwilling to do anything about it

My pragmatic money is on a combination of the three, but I know for a fact that training a good tradie, supervisor, craftsman, or leader even takes time, and is quite expensive.

Based on recent experience, I also know that general blue and white collar skill levels are fundamentally compromised, at least in the industries I’m familiar with.

Regardless, the existence of this problem means there is opportunity in solving it.

 

So, I’ve started taking steps towards exploiting that opportunity.

The first of which was to start trading as a sub-contractor on a short-term gig.

This lasted from February to May this year, and was both the best and worst of times.

On the plus side, my crew were great blokes who were all really good at their jobs.

It was a small site, so we had minimal management bullshite to deal with, and a reasonably stable workload.

It’s also refreshing to be able to do the job without having to worry about the PC police.

On the down-side, small operations can sometimes be sinks for incompetence and nepotism.

So it proved here.

We had a sub-contractor (with some of his own employees on site) supervising other sub-contractors, and blatantly blaming others for the failings of his own people.

One of his blokes had an incident on another part of the site – it was bad enough that he was medevaced.

Afterward, in a pre-start meeting, this clown threatened to “bury” anyone who reported safety issues.

An immature twunt in my opinion, but you get that.

Myself, and others, had also seen holes in the cheese lining up.

 

To explain that comment further, the swiss cheese theory (https://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=&cad=rja&uact=8&ved=2ahUKEwiYwePUl6j_AhU1cmwGHQWfAJ0QFnoECAgQAw&url=https%3A%2F%2Fwww.ncbi.nlm.nih.gov%2Fpmc%2Farticles%2FPMC1298298%2F&usg=AOvVaw2R591f7PUHNriBbq_ocXup) basically means that every major incident or accident is the culmination of lots of little things going wrong.

If enough of these small failures (known as holes in the cheese) line up, someone can get hurt or killed.

Extreme examples include the Piper Alpha disaster (https://en.wikipedia.org/wiki/Piper_Alpha), the three Moura disasters (http://www.mineaccidents.com.au/mine-accident/26/kianga-no-1-mine-explosion-1975, http://www.mineaccidents.com.au/mine-event/48/moura-4-mine-1986, http://www.mineaccidents.com.au/mine-event/49/moura-2-mine-1994), the Mt Mulligan disaster (http://www.mineaccidents.com.au/mine-event/42/mt-mulligan-mine-1921), and so on.

I’ve never worked off-shore, but I can imagine the terror of those blokes on the Piper Alpha when the holes in the cheese lined up and an incident became a high-order accident very quickly.

I have worked at Moura – the monument to the eleven blokes killed underground in 1994 is quite sobering.

Twenty-one blokes went to work that night expecting to come out safely twelve hours later.

They had no idea that the holes in the cheese had already lined up, and some of them would be entombed there forever as a result.

I never want to experience that directly, or for anyone else to experience it.

But, fact is that it’s coming, and it will happen by lots of little things going wrong.

Most of which will be preventable, but overlooked, or ignored.
You see enough shite go wrong, and you get better at seeing the holes in the cheese line up.

Hence I get a bit of a bug up my arse when I see it happening.

 

So, on top of old mate hurting himself, we had one mini-bus full of people leave the road at speed, and get damaged bad enough that the chassis was bent.

No-one hurt, but the incident wasn’t reported.

The damage was only found after the vehicle went in for service.

Another time, a bus I was a passenger on drove straight through a stop sign in an industrial area.

Not cool.

Yet another time, a so-called expert got a lifting procedure really wrong, causing an uncontrolled energy release, and badly damaging some equipment.

On the face of it, none of these are major incidents.

But they could have been.

When you have supervisors (who have a statutory responsibility for these sort of things) bullying people to not report them, well, you have another hole in the cheese – a big one.

A few photos to sum my feeling up on that point.

https://static.wixstatic.com/media/70197a_60196b73aa7549eaa220388624b8f92d~mv2.jpg/v1/fill/w_820,h_1094,al_c,q_85,usm_0.66_1.00_0.01,enc_auto/70197a_60196b73aa7549eaa220388624b8f92d~mv2.jpg

https://static.wixstatic.com/media/70197a_3fdb6bb16f2f4649a6b6fbd000f7b9b9~mv2.jpg/v1/fill/w_820,h_1094,al_c,q_85,usm_0.66_1.00_0.01,enc_auto/70197a_3fdb6bb16f2f4649a6b6fbd000f7b9b9~mv2.jpg

https://static.wixstatic.com/media/70197a_e071d5ba8723494980e04f69fd4aa14d~mv2.jpg/v1/fill/w_820,h_1094,al_c,q_85,usm_0.66_1.00_0.01,enc_auto/70197a_e071d5ba8723494980e04f69fd4aa14d~mv2.jpg

https://static.wixstatic.com/media/70197a_c9aadc5f7cf84638b02726183dd691b8~mv2.jpg/v1/fill/w_820,h_1094,al_c,q_85,usm_0.66_1.00_0.01,enc_auto/70197a_c9aadc5f7cf84638b02726183dd691b8~mv2.jpg

https://static.wixstatic.com/media/70197a_609480cbc7104ba4834a84c37d329d56~mv2.jpg/v1/fill/w_820,h_1094,al_c,q_85,usm_0.66_1.00_0.01,enc_auto/70197a_609480cbc7104ba4834a84c37d329d56~mv2.jpg

https://static.wixstatic.com/media/70197a_58a1445e75ed4cb6ac84913f823911db~mv2.jpg/v1/fill/w_820,h_1094,al_c,q_85,usm_0.66_1.00_0.01,enc_auto/70197a_58a1445e75ed4cb6ac84913f823911db~mv2.jpg

https://static.wixstatic.com/media/70197a_36f28d36517044bdb65e49603208ee1f~mv2.jpg/v1/fill/w_820,h_1094,al_c,q_85,usm_0.66_1.00_0.01,enc_auto/70197a_36f28d36517044bdb65e49603208ee1f~mv2.jpg

https://static.wixstatic.com/media/70197a_631a2ee82aee4457a9d37c82f77d9e37~mv2.jpg/v1/fill/w_820,h_1094,al_c,q_85,usm_0.66_1.00_0.01,enc_auto/70197a_631a2ee82aee4457a9d37c82f77d9e37~mv2.jpg

 

Anyway, this gig was set to finish in August, so I was already looking around for the next thing.

Luckily, I secured another gig three weeks ago, and was agonising over how much notice to give the old job.

As it happens, I was finished up at the end of that swing, so I didn’t have to give any.

No big deal – it happens as a subby, and I was expecting it anyway.

So, I was looking forward to having a couple of weeks off, then starting the new gig.

 

Well, to address my opening remarks, I had a couple of weeks off alright.

I spent them trying to recover my last invoice, which, despite having signed timesheets, the client was disputing.

Then my tools went missing while in the care of the client.

Neither of these things made me a happy bunny.

Assuming the worst, I tapped into all the outside help I could – happily, there are plenty of government legal resources available here for just such situations.

When I had all my ducks and drakes in order, I had one last shot at reaching out to a senior client manager on site to plead my case.

Within twenty-four hours, he had found my tools.

Within forty-eight hours, the client had agreed to honour my last invoice.

I hate having to go all Karen, but it’s funny how things can change when you go to the organ grinder, rather than the monkey.

 

This change of employment is relevant for a couple of reasons.

First and foremost, my new gig is a staff (shiny-arse) role – I’ll be home for a three-day weekend every weekend, and, after a month or so of on-boarding, will be working from home every second week.

I’ll also be earning more, so my project time and cash budget has grown.

Second, it’s a twelve-month contract, so my options to take leave in the next year are limited.

I’m already committed to a family trip in June/July this year, which the new client has agreed to honour.

I’m already committed to TT24, and have already forewarned the client that I’ll be having time off for that.

However, taking two weeks off in August/September to do the Simpson Desert trip is not likely to happen.

Nor is taking a week off in March next year to drive down to speed week.

I can live with these delays – they are sideways detours to get me closer to the big-picture goal.

 

On the project front, I did spend some time last week videoing work with the intent of writing less, and filming more.

However, getting paid and tracking my tools down occupied most of my bandwidth, and I didn’t get as far along with this as I would have liked.

On the up-side, with the prospect of not getting paid in full, I did spend some time revising my project budget.

Happily, I now have a pretty good idea of the projects I want to do, and at least a rough idea of how much they’re going to cost.

This has allowed me to expand my project scope – more about that in due course.

 

For now, I have linked my tame engineer to the video I posted earlier of Gurty’s 2D suspension model (https://youtu.be/_IzES1fKpWI).

I have also indicated which materials I intend to use (e.g. tube, round bar, and flat bar etc.), and how I intend to join it (e.g. brazing, bearing, and bolts etc.).

He already knows that I intend to boost the engine, and from the video he’ll have some idea of what I need the whole package to do.

What I need from him is some guidance as to whether my design is, in his eyes, feasible.

If it’s not feasible, I need guidance on how I make it so.

For no other reason than I can, I have also been researching compound turbos, and doing the calculations to identify a suitable smaller companion turbo to partner with my current TD04.

I have also found a supplier of spoked tubeless rims – they’re not cheap, but they are strong.

No, I’m not going to modify a set of spoked rims with spackle, or anything else for that matter.

That’s just an accident waiting to happen.

I have sourced the material for my frame jig, and have started making it.

No photos or video yet, as I needed to get another household welding project (a new gate for the side of the house – one big enough to get bikes and stuff through) out of the way first.

I have also decided to delay making my blast-box – Gurty’s frame won’t need it, and I can out-source this as required until I have the necessary time and space.

I’ve managed to track down just about all the parts I’ll need to rebuild and boost the engine – I’ll start ordering this week.

I’d ideally like to dyno the rebuilt engine before turbo-ing, and after – after all, as old mate says here @15:20 (https://www.youtube.com/watch?v=790IVZBIoqI) without data, all I have is opinions.

And I’d really like to know how much I’m gaining.

Time will tell on that one.

 

In other news, dad has found himself a new place, and will be moving in August.

In the meantime, he’s staying with his sister, and is making plans to do all kinds of trips to go and see old mates.

Funny thing is that mum always said they didn’t travel much because dad wouldn’t or couldn’t leave home.

Based on how much he’s getting about now leads me to understand it might have been the other way around.

It’s also been a wake-up call for me.

Time gets away quick – if I don’t take concrete action to bring my projects to fruition, then they might not happen.

No-one else is going to make this happen.

It’s on me.

Hence the motivation for the career diversion I spoke about earlier, as well as my choice of projects going forward.

On a similar line of thought, further to my last update, Quicky’s mate did a quite touching eulogy on his channel (https://www.youtube.com/watch?v=j5HHgwjpxy4).

I don’t know why, but got all emotional watching it.

It has also motivated me a lot.

As has watching the NW200 and TT23 footage over the last couple of weeks.

Watching it online is one thing – seeing it in person is entirely another.

I may have said this before, but seeing my first TT changed my life.

For the better, too.

 

Finally, I had my quarterly blood-work four weeks ago.

I’m due to see my Urologist in about four weeks’ time – he’ll update me on my cancer status then.

In fact, after nearly a year back doing hard physical work, I’m fitter and stronger than I’ve been for a long time.

Other than occasional shooting pains right up my core, I feel fine.

However, this happens intermittently, and is bad enough that it brings tears to my eyes.

I usually have to stop what I’m doing to see what’s going to happen next.

Options include vomiting, shiteing myself, or passing out.

Hasn’t happened yet, but always feels like it could.

The first couple of times it happened, I thought I had bowel cancer.

Tests for that returned negative results.

For now, until told otherwise, I’m relatively cancer-free.

 

My GP is still yelling at me for having high cholesterol.

Despite using a combination of diet and exercise to drop from 108kg to 92kg, my bad cholesterol is still up.

Given how much weight I’ve dropped, I’m not sure that diet alone will be enough to lower it, but my GP has convinced me to see a dietician next.

I’m sceptical, but I really don’t want to medicate unless I really have to, so I’m prepared to give it a go.

I plan on updating more frequently going forward, and being more active on the socials.

Time will tell as to whether or not I can make that stick.

C3M.