Sooty
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Registered: 9th Mar 03
Location: FLAP CENTRAL
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oh 40 profile.... 45 here
Lightweight? Try some raceline 15's on 45 if you ever come down
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Patrick
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Registered: 25th Apr 02
Location: SE London
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The other way it looks is as if you can get faster 1/4 mile times with smaller wheels but faster 0-100mph times with bigger wheels. Don't make much sense to me!
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3CorsaMeal
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Registered: 11th Apr 02
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what is mph? = miles travelled for each hour of moving.
Imagine a wheel with a 1 mile rolling radius, it would need to turn once. say it took 1 hour to move that wheel round = 1 mph.
Could u make a wheel with a 1/2 mile rolling radius, do two turns, in less time than the big wheel, but with the same power?
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Hillzlo
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Registered: 9th Nov 02
Location: Noitacol
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3CorsaMeal
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Registered: 11th Apr 02
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good head!
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Patrick
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Registered: 25th Apr 02
Location: SE London
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quote:
Originally posted by 3CorsaMeal
what is mph? = miles travelled for each hour of moving.
Imagine a wheel with a 1 mile rolling radius, it would need to turn once. say it took 1 hour to move that wheel round = 1 mph.
Could u make a wheel with a 1/2 mile rolling radius, do two turns, in less time than the big wheel, but with the same power?
Didn't get any of that!
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Cybermonkey
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Registered: 22nd Sep 02
Location: Sydney, Australia
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in theory yes it would cover the same distance, only quicker.
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3CorsaMeal
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Registered: 11th Apr 02
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think about it more then! 
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Patrick
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Registered: 25th Apr 02
Location: SE London
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I'm hungry and I don't want to think! 
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3CorsaMeal
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Registered: 11th Apr 02
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yeah it would do the same distance = 1 mile.
Would it need to spin faster to do it?
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Patrick
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Registered: 25th Apr 02
Location: SE London
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It would need to spin twice as fast.
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3CorsaMeal
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Registered: 11th Apr 02
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So, which wheels is travelling faster at its circumference?
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Patrick
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Registered: 25th Apr 02
Location: SE London
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Can I just stop you there. If the bigger wheel has one turn and the smaller wheel has two turns both to cover the same distance then the smaller wheel is travelling faster. Which would mean that the smaller wheel would have a faster terminal speed not the bigger wheel! 
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3CorsaMeal
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Registered: 11th Apr 02
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that comes from how fast the circumference is moving along the ground, things further away from the centre of revolution travel at higher speeds, but take more power to get it going!
Ie, the big wheel is slower to accelerate to its max speed, but when its get there it moves faster....
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Gower
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Registered: 18th Mar 01
Location: So close.....yet so far
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I feel that i cannot help you with this problem.
Do you have any other problems?
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Super_si
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Registered: 4th Mar 01
Location: lurkin' somewhere........................
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Its an option  hehehe
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Patrick
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Registered: 25th Apr 02
Location: SE London
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Erm... well I'm hungry! But that will be sorted cos I'm going to lunch in 20 minutes. No other problems at the moment.
3cm - I'm still trying to work this out. Bare with me!
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3CorsaMeal
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Registered: 11th Apr 02
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i might be talking complete shite
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Adam
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Registered: 1st May 01
Location: Hurstbourne Tarrant
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quote:
Originally posted by Gambit
quote:
Originally posted by Patrick
But surely the quicker you are going the faster you are getting?
thats my thinking also
No
the gear have different ratio's, so you will get more torque in 1st gear (more acceleration) because the ratio is (for example) 4:1 so if the engine produces 100lb/ft then in 1st the wheels see 400lb/ft.
4th gear is 1:1 so the wheels only see 100lb/ft
Hope that makes sence
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Andy
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Registered: 28th Dec 99
Location: Cumbria, UK
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Here's an idea - smaller wheels give you an effective lower gearing than larger wheel - hence initial acceleration is snappier. But this also means that at high speeds in any one gear, you have more transmission losses, so energy losses are greater - giving a lower terminal speed. However, there's no way it would make 10mph difference, so I reckon most of it is just inconsistent/poor timing...
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beav
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Registered: 20th Aug 01
Location: Home-Ayrshire (Troon), Uni-St Andrews
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Yeah, i think this is similar to when Gogs in a modified GSi raced Kindness in the bucket. Kindness got lik a 15.1 (or omsehitng like that) at 90mph and Gogs got a 15.7 odd at 100mph. So kindness won but with a much lower TV. strange!
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Patrick
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Registered: 25th Apr 02
Location: SE London
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quote:
Originally posted by Andy
so I reckon most of it is just inconsistent/poor timing...
It's not down to inconsistances though cos I had 5 runs on 16's and all those had terminals of either 93 or 94mph and then I had 5 runs with 14's and all those had terminals of either 84 or 85mph. Really odd I know hence the post to try and get a solution to it all!
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m4tt_c
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Registered: 24th Mar 02
Location: essex
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i wouldnt of said the timing equipment was shit either as it was santa pod? which is whatever (i cant remember the name) approved,
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3CorsaMeal
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Registered: 11th Apr 02
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is just physic's!
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Patrick
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Registered: 25th Apr 02
Location: SE London
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Well bring on the physics genius! 
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