Rick,
I'm not sure where the 482 came from in the equation? That should be
420, as you said was given by the Michelin site, which results in 12.57 feet
per revolution. This puts you at *52* mph using the rest of the numbers
given below. That seems much more reasonable to me...
--Neil
----- Original Message -----
From: "Richard Lathrop" <lathrrs@snip.net>
To: "Military Vehicles Mailing List" <mil-veh@mil-veh.org>
Sent: Friday, December 28, 2001 4:42 AM
Subject: Re: [MV] M35A3 data needed
> According to the Michelin website the 14.5R20 XL goes a mile in 420
revolutions.
>
> So 5280 feet (1 mile)/482 =10.95 feet per revolution. In 4th gear and the
transfer in high gear you get a overall reduction ratio of
1.1*1*6.722=7.3942. With the engine optimum rpm at 2700 rpm the wheel would
be turning at 2700/7.3942=365.15 rpm. 365.15*10.95=3999.98 feet per minute.
3999.98*60 minutes=239,999.00 feet per hour 239,999/5280=45.45 mph
>
> The Michelin XL 14.5R20 has a max speed rating of 56 mph.
>
> Hope this helps,
> Rick
>
>
>
>
>
>
>
>
> ---------- Original Message ----------------------------------
> From: DDoyle9570@aol.com
> Date: Thu, 27 Dec 2001 22:20:14 EST
>
> >In a message dated 12/27/01 9:58:08 PM Central Daylight Time,
> >jemery@execpc.com writes:
> >
> ><< Isn't there an overdrive? Else you'd have to have a 5000 rpm engine
to get
> > anywhere with a top gear of 1.1:1
> > >>
> >Well, this is an interesting question. No, there is no overdrive.
> >Interestingly, the 1.1 to 1 ratio is exactly the same gear ratio the
original
> >gas powered 5 speed manual has in high gear. The old gasser would do 62
MPH,
> >but of course the Reo OA-331 gas engine would turn up to 3400 rpm.
> >The Cat in the A3 only turns to 2700 rpm, however, the outside diameter
of
> >the Michelin 14.5R20XL tires is likely to be greater than the old 1100x20
or
> >900x20 tires, which will affect the final drive ratio.
> >As an aside, the Multifuel engine of the A2 turns to 2600 RPM, with the
fifth
> >gear (overdrive) ratio of .79 to one.
> >If not helpful, hope you at least find this entertaining!
> >David
> >
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> >
>
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>
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