[Shotimes] (OT) Marauder

[David P]

I'm thinking about my days running around the counties as a youth in my '70
Coupe deVille. I did triple digit speeds quite often, and that car had one
very long and very heavy driveshaft. I don't remember the final drive
gearing, though. Broke the CV's a few times.



David P

95MTX



~
----- Original Message -----
From: "John Miller" <jem@milleredp.com>
To: "'shotimes'" <shotimes@autox.team.net>
Sent: Monday, February 10, 2003 02:00
Subject: Re: [Shotimes] (OT) Marauder


> > Can't that be resolved with a balancing? Or a pre-balanced aluminum
> > replacement?
>
> What it really comes down to is that even the best-balanced one piece
> shaft, if it's long enough, is going to tend to whip, particularly if it's
> slung between a typical pair of single-Cardan U-joints.  In that
> configuration, the shaft acts like the center-cage of a CV joint - its
> rotational speed fluctuates during rotation, and the extra
> accelerations/decelerations and higher peak speeds helps promote whip.
> There's a  specific calculation that you can feed in the bending stiffness
> and length of the shaft and it'll spit out the critical rotational speed
at
> which the shaft tries to make itself look like a sine wave.
>
> You can use a lighter shaft, or a stiffer shaft, or both (either very
large
> diameter aluminum, or carbon-fiber, or carbon-fiber-wrapped aluminum) or
> you can shorten the shaft segments and use a two-piece shaft design (as
> Ford Australia did in the Pursuit Ute.)
>
> John.
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