I have a question about vehicle gradeability. I own an 1953 XM211 and
according to the manual, the maximum grade is 60%. A friend of my that
happens to be an electrical engineer says that the 60% grade is based on a
45 degree incline. Example, 90 degrees would make a right triangle because
you wouldn't be driving straight up, you would actually be driving up the
hypotenuse which is actually 45 degrees. Are you still with me? O.K. now
that your driving up the hypotenuse, which is 45 degrees, you would take 60%
of 45 and get 27 degrees. Am I correct to say this? However, this sounds
like a low figure to me. I once took a trip to the Talladega Speedway in
Alabama. The tour included several laps around the oval. The tour guide said
that the turns were banked at 33 degrees. He also stated that it required a
speed of 85 MPH to stay on the turn, otherwise you'd slide off. We drove on
the very bottom of the turn, on the flat part. We were in a ford van and I
looked out the window and could not see the top of the turn. I looked so
steep, as if you couldn't even walk on it.
Now, that I'm thinking. If the legs are of different lengths then wouldn't
the slope of the hypotenuse change, thus making the hypotenuse shallower or
steeper? Therefore, you could get an infinite number of slopes. Maybe some
one out there can answer these question.
Ken
53' XM211
54' XM105E3
Lone Star M.V.P.A.
-----Original Message-----
From: Dr Deuce 264-0909 <keith@apache.ENET.dec.com>
To: @[keith]sky
<mail11:;;;;@us2rmc.zko.dec.com@us2rmc.zko.dec.com;;;@server6.wans.net>
Cc: keith@apache.ENET.dec.com <keith@apache.ENET.dec.com>
Date: Tuesday, March 17, 1998 06:25
Subject: RE [MV] Vehicle gradability
>At Aberdeen Proving Grounds MD (APG) there is a test facility with an
artifical
>concrete hill with various grades built into it. The max grade is 65
degrees I
>believe and cannot be walked up. You kinda have to crawl up it.
>
>When they have their open house in May, they usually give tours. To see an
M1A1
>tank climb up the max grade is something else!
>
>All the vehicles have to climb 1/2 way up the grade and be shut off with
the
>parking brake holding the vehicle. The vehicle is then checked for leaks.
Then
>it is restarted and a 'hill start' is performed. This must be quite a trick
in
>a Jeep to not go over backwards!
>
>There is a large steel plate at the top of the hill over which a cable is
>placed. The cable is tied to the vehicle under test and to another vehicle
of
>equal weight on the other side of the hill in case something goes wrong
during
>the test...
>
>
>Steve
>
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