[Spridgets] Bentley-RR Trivia: was calculating speed

Kitterer Bob bkitterer at mac.com
Wed Oct 22 01:06:43 MDT 2008


Brain fart - - sorry

Bob Kitterer

On Oct 21, 2008, at 5:19 PM, Hal Faulkner wrote:

> Bob,
> Circumference of 10" wheel is 31.4159.... inches (10 pi)
> Circumference of a 20 inch wheel is     62.82318 (20 pi = 2(10 pi))
> Hal
>
> -----Original Message-----
> From: spridgets-bounces at autox.team.net
> [mailto:spridgets-bounces at autox.team.net]On Behalf Of Kitterer Bob
> Sent: Tuesday, October 21, 2008 4:46 PM
> To: Spridget List
> Subject: Re: [Spridgets] Bentley-RR Trivia: was calculating speed
>
>
> 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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