Test stand

Share your thoughts, photos and general help to all builders

Postby artman12us » Wed Oct 26, 2005 3:25 pm

Anyone have a picture of a simple test stand? Thanks Art
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Postby Shannon » Wed Oct 26, 2005 4:08 pm

Scroll to the bottom of the P-tip segment.

http://lazairforce.central5.com/
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Postby Chappy » Thu Oct 27, 2005 7:30 pm

Art,

Here is the one I've used for 26 years. Made it out of junk that was sitting around. Wheels let it move, spring scale lets you compare static thrust of engines, tuning and mods. I use two lines - the spring scale line, and a backup safety line that's a little longer in case the first line/scale fails. The second (back up) line also pulls the kill switch to shut down the engine if it gets pulled tight.

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Postby artman12us » Thu Oct 27, 2005 8:11 pm

Thanks Chappy, How many pounds do measure when tuned up.
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Postby Chappy » Thu Oct 27, 2005 10:13 pm

OK, these are numbers for PIONEERS with my own homemade pine props and 2.75:1 redrives:

Absolute Max static thrust, straight 4" pipes = 65 pounds each

Using homemade exhaust (twin Briggs and Stratton 8 hp mufflers on a splitter manifold, pointed up) = 55 pounds each (Detuned, running nice and rich, closer to 50 pounds each.)

I forget what my 185's with bi-blades run.

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