Bob, I don't want to rain on your parade, but the height you would end up with would be a perfect neck severing height if a blade separated! Prop axis horizontal is really the safest as you can stand out of the "line of fire" so to speak. It is actually safer even if it doesn't look like it. Also the prop blowing toward you is also safer should the prop shaft separate as the prop will fly AWAY from you.
Bob Tilley wrote:
> Folks,
>
> Here's a picture of Tracy running the muffler.
Tracy's expression is almost funny in that picture, and there was a brainstorming session on Saturday evening about how build a 'dyno' that isn't quite as dangerous or tortuous as a prop. Lot's of ideas, with the best one being Tracy's suggestion that the best dyno is a flying airplane.
Well, not having a flying airplane yet, I spent a lot of time considering it on the 10hr drive home. The best I could come up with would be to use a prop with reverse pitch so that it blows away from you. That one would be easy.
The second best would be to tie the engine output to rear wheel drive vehicle's drive shaft, going through the differential. Turn the axle on it's side so that the tire on the ground is locked in place, and forces the wheel on top to spin. An adapter on the top hub would attach a propeller that blows up (applying a down pressure to stabilize the stand). Remove the prop and put the wheel back on to transport it.
(I know. I shouldn't be allowed to drive long distances by myself.)
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