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Messages - StefanN

Pages: [1] 2 3 ... 26
Events / Re: Garat GP 2020
« on: 05 August 2020, 09:25:48 am »
Hey Fabrice,  That looks like it was fun.    Nice collection of Amilcars too.

Off Topic / Re: Inspiration pics
« on: 30 July 2020, 03:25:54 pm »
I did get in contact to see if they might invite cyclekarts to the Festival of Slowth but they declined.  Its an invitation only affair and it needs to be slow, old and ideally unusual/rare.

Off Topic / Inspiration pics
« on: 30 July 2020, 08:22:14 am »
Whilst I’ve seen lots of Stefan Marjoram’s images online, I’ve only just found his Flickr account.   If you want to while away an hour or two then it’s worth a browse:


Great cars beautifully captured.

Tech Forum / Re: Limited slip freewheel
« on: 29 July 2020, 01:41:17 am »
In case it’s helpful, Gemini have the steel adapter plates with the same hole pattern as the pit bike wheel - already cut and pennies to buy.  These were designed to allow kart hubs to be used on pit bike wheels but might be helpful if mild steel will suffice for the LSF “limited slip freewheel”.

Tech Forum / Re: Limited slip freewheel
« on: 28 July 2020, 09:03:58 am »
That's interesting Rhys.   How was the hub supported on the axle in your original design?   What was the fibre washer pushing against in the hub?   I notice the new design that Adrian has posted has changed a little and wonder why given the original worked so well across such a large power range.   Do you have any photos of ones you built on vehicles?

Tech Forum / Re: Limited slip freewheel
« on: 27 July 2020, 07:58:32 am »
Fabrice has been using a similar concept with a different friction material.   He’s shared his details on the French CK site:  http://www.cyclekart-fr.com/forum/index.php?page=post&ids=5480

[We] used a plastic disc (POM or Polyacetal but not Nylon or Teflon)
This disc is placed between the axle plate and the wheel hub, then tightened enough so that the wheel cannot turn "by hand" but only with the weight of the Ck, the centrifugal force and the difference in radius between the INT and EXT wheel....
In fact we say "freewheel" but it is wrong !! it has to be as little as possible otherwise there are a lot of effects in the steering wheel (imbalance) during acceleration and when braking.

You will probably have to put a bolt at the end of the axle to constrain the wheel and prevent it from being "too loose" or if you use a circlip you can add spring washers like on my wife's Ck ( view the photos)

Build journals / Re: Bugatti Type 37 Build
« on: 27 July 2020, 07:49:23 am »
Because it’s relevant to all cyclekarts and is likely to have quite a lot of discussion, I’ve moved the posts about the limited slip freewheel design to its own “topic” in the technical forum:

Tech Forum / Re: Louvres
« on: 24 July 2020, 08:29:36 am »
Yet another approach

Tech Forum / Re: Limited slip freewheel
« on: 23 July 2020, 11:34:50 pm »
Sounds interesting.  Looking forward to seeing the design.

Build journals / Re: Bugatti Type 37 Build
« on: 22 July 2020, 11:24:46 am »
I’m only surprised in as much as I suspect that 90% still follows simple engineering principles and you only need to get into the details and nuances to extract the last 10% in more extreme performance than we hope for from cyclekarts.

I’ll mix in some experimental evidence and see what I conclude.

Members / Re: New member GerardG
« on: 22 July 2020, 11:17:43 am »
Welcome Gerard

Try the “Where to get stuff” area on this forum.


You might also want to contact the French Cyclekart Group.

Build journals / Re: Bugatti Type 37 Build - tyres
« on: 22 July 2020, 09:13:51 am »
Ok, the whole tyre thing is getting more complicated... in theory
Will be glad to try it out on the track.

Yes please for Marek and me.

Build journals / Re: Bugatti Type 37 Build
« on: 19 July 2020, 03:54:44 pm »
What's your weight distribution like?  Mine is 70kg rear, 35kg front, so exactly 2:1.
89kg rear 42kg front, so overall a bit more portly but only slightly more rear biased than yours.

Also, from pictures it looks like I sit further back than you (and add more weight!)

Build journals / Re: Bugatti Type 37 Build
« on: 19 July 2020, 11:04:58 am »
Yes did lots with tyre pressure and it helped, but not enough.   I have a suspicion that pushing the rear tyre pressure up might have contributed to my spokes loosening at the end of last year.   

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