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Re: Limited slip freewheel by StefanN
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Author Topic: Bugatti Type 37 Build  (Read 27847 times)

ChrisS

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Re: Bugatti Type 37 Build
« Reply #135 on: 19 July 2020, 11:11:53 am »
What's your weight distribution like?  Mine is 70kg rear, 35kg front, so exactly 2:1.

RhysN

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Re: Bugatti Type 37 Build
« Reply #136 on: 19 July 2020, 02:43:10 pm »
At some point increasing tyre pressure = more grip, (somewhat counter intuitive) so may have added to the spoke issue, but also more rear grip would make the understeer issue worse.

StefanN

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Re: Bugatti Type 37 Build
« Reply #137 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!)

StefanN

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Re: Bugatti Type 37 Build - tyres
« Reply #138 on: 22 July 2020, 09:13:51 am »
Ok, the whole tyre thing is getting more complicated... in theory
https://www.f1technical.net/forum/viewtopic.php?t=12762
Will be glad to try it out on the track.

RhysN

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Re: Bugatti Type 37 Build
« Reply #139 on: 22 July 2020, 11:00:23 am »
Interesting links, but are you really surprised? I could recite a lengthy story where the same size tyre from different manufacturers could make a difference of places in a race of several tens out of 50 odd competitors. Side wall flex, type of rubber, pressures are only some of the factors.
If it were simple then there would not be millions spent on tyre technology.
Once upon a time, not long ago it was considered that cornering or braking forces in excess of 1g were impossible. Now even non-aero cars are way above that.

StefanN

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Re: Bugatti Type 37 Build
« Reply #140 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.

StefanN

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Re: Bugatti Type 37 Build
« Reply #141 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:
http://www.cyclekartsgb.com/tech-forum/limited-slip-freewheel/

StefanN

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Re: Bugatti Type 37 Build - Brakes
« Reply #142 on: 23 September 2020, 01:48:57 pm »
I realised that I didn't share my new brake set-up.  I went through a design process with the aim of having enough braking force to lock the rear wheels with a target foot travel and pressure.  So far I'm very pleased with the result.

0.7" Wildwood master cylinder from Rallydesign.co.uk http://www.rallydesign.co.uk/product_info.php?products_id=4052 £32
Front calliper from a 2007-2012 Suzuki GSF 650 Bandit £20 from a breaker on eBay.  The one I got was in good condition but you might need to replace seals on 2nd hand units.
Standard Gemini brake disc

The brake calliper has 2x 27mm pots and 2x 33m pots (CSA = 28.6 sq cm)

On no account should anyone be foolhardy enough to take any notice of what I've used.