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Re: cheaper dyno?

To: shop-talk@autox.team.net
Subject: Re: cheaper dyno?
From: dave.williams@chaos.lrk.ar.us (Dave Williams)
Date: Wed, 15 Dec 1999 10:53:00 -0500

-> easily, too, but I might be off on that.  anyway, check a local
-> railyard, or another suggestion was a 35-gallon drum filled with
-> cement.  have to get it balanced pretty good, though to use it as a
-> roller.  good luck either way.

 I proposed both on the mc.chassis list some years ago.  Any automotive
engine shop with a Stewart-Warner balancing machine can balance the
rotors with no problem; mine will take a rotor up to 6 feet long, 7 feet
around, and 2000 lbs.

 The proposal for a concrete rotor involved dropping a roll of rabbit
wire or chain link fence into the drum first, to provide tensile
strength.  There are various grades of concrete as well, some with much
greater tensile strength than others, but acquiring quantities less than
truckloads can be difficult.

 When I was seriously considering building an inertia dyno along that
line I also investigated possibilities for an explosion shield should
the rotor disintegrate.  I found the corrugated steel culvert used under
roadways can be had in appropriate lengths and diameters for under $100.
It's fairly heavy steel, and the corrogations would provide extra energy
absorption as they were deformed by flak.  An explosion shield would
also keep dorks from trying to touch the spinning rotor.

==dave.williams@chaos.lrk.ar.us======================================
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