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Re: [Spridgets] Bentley-RR Trivia: was calculating speed

To: Kitterer Bob <bkitterer@mac.com>
Subject: Re: [Spridgets] Bentley-RR Trivia: was calculating speed
From: Lester <oldsaabguy@comcast.net>
Date: Tue, 21 Oct 2008 21:37:33 -0500
which is why I specified circumference not diameter..  ahem..

Lester

;-0


On Oct 21, 2008, at 6:45 PM, Kitterer Bob wrote:

> Going from 10 to 20 inch wheels at the same rpm will be three times
> as fast  not twice - C= pi D  :-0
>
> Bob Kitterer
>
> 1960 Austin Healey Sprite (Mk IV in disguise)
> 1966 Austin Healey Sprite Mk III (Trevor) - still in boxes
> 2000 Miata Special Edition
>
>
>
>
> On Oct 21, 2008, at 11:58 AM, Lester wrote:
>
>> For example a 20 hp bike motor that will turn 6000 revs (and
>> pretending that the tranny is direct drive) will turn the tires
>> 6000 revs.  If those are 10 inch circumference tires then the bike
>> will go speed x,(no, I'm not going to calculate it out.) but if you
>> have 20 inch circumference tires then the bike will go twice as
>> fast *** IF *** it is not limited by drag and that the engine can
>> turn the 20 inch circumference tires at 6000 revs.
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