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I've always considered that I've got a pretty high risk tolerance (bullriding, etc.), but this is one that I wouldn't touch. Too high of risk with too little payback. I believe the timber would be plenty strong enough if you could ensure balance, but this is not likely. Odd's are that it would be out of balance which would contribute to it's demise. Even if it did hold together, I hate to thing about the loads it would be imposing on bearings in your PSRU & engine. It's a sh***y job as it is to stand next to a 4000 rpm spinning prop while setting your static timing. I wouldn't want the engine being shaken apart while I was doing it. Sure you could get your fence post balanced, but why? It's probably less effort to find a prop, even if it's not the one you'd want to fly with.
Just my $0.02
Todd Bartrim
On 9/12/06, Ernest Christley <echristley@nc.rr.com> wrote:
Ed Anderson wrote:
>
>
> If you find the equation, I'd like to see it. A 4" square piece of
> timber is more than I would care to have swinging at 2400 rpm in front
> of me {:>).
>
> Ed
>
For a test stand, the timber has safety advantages. It will produce
lots of vortex energy in the air, but no directional vectors. There
won't be 180 horses trying to pull the engine off the stand, pulling the
stand over, or picking up debris and blowing it directly in your face.
Any piece of wood that hits you spinning that fast will sever a body
part. A piece of timber that large can easily handle the tensile loads
as long as the grain is straight and is knot free.
--
,|"|"|, Ernest Christley |
----===<{{(oQo)}}>===---- Dyke Delta Builder |
o| d |o http://ernest.isa-geek.org |
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