Good catch. According to the Michelin site the the 14.5R20 has 482 revs per mile the 14.00R20 422 revs per mile. My original calculations were for the 14.00R20, I realized my error and revised the numbers.
Rick
---------- Original Message ----------------------------------
From: "Neil E. Amrhein" <neil@compu-powr.com>
Date: Fri, 28 Dec 2001 07:02:38 -0500
>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
>> >
>> >===Mil-Veh is a member-supported mailing list===
>> >To unsubscribe, send e-mail to: <mil-veh-off@mil-veh.org>
>> >To switch to the DIGEST mode, send e-mail to <mil-veh-digest@mil-veh.org>
>> >To reach a human, contact <ack@mil-veh.org>
>> >
>>
>> ===Mil-Veh is a member-supported mailing list===
>> To unsubscribe, send e-mail to: <mil-veh-off@mil-veh.org>
>> To switch to the DIGEST mode, send e-mail to <mil-veh-digest@mil-veh.org>
>> To reach a human, contact <ack@mil-veh.org>
>>
>
>
>===Mil-Veh is a member-supported mailing list===
>To unsubscribe, send e-mail to: <mil-veh-off@mil-veh.org>
>To switch to the DIGEST mode, send e-mail to <mil-veh-digest@mil-veh.org>
>To reach a human, contact <ack@mil-veh.org>
>
This archive was generated by hypermail 2b29 : Sun Jan 06 2002 - 22:26:53 PST