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Todd Bartrim wrote:
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.
Todd, you can put together the balancing apparatus with stuff from your junk-bin. A foot of drill rod and two feet of steel angle. A post-it note will serve nicely to help you dial in a perfect balance. It would take an hour or two in the garage to get the balance perfected, and then the static test would be a little less sh***y once you remove the 30mph wind from your face.
People who don't build airplanes think I'm crazy for building an airplane.
People who build airplanes think I'm crazy for building a plans built, delta wing.
Everyone else thinks I'm crazy for carving a propeller.
Don't worry, guys. I won't be using a fence post for a test club. I'll use the blank that will become my prop. A fence post would make a horrible propeller blank. It's very hard to control the warp when carving thick wood sections, a major reason for building props from laminated blanks.
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,|"|"|, Ernest Christley |
----===<{{(oQo)}}>===---- Dyke Delta Builder |
o| d |o http://ernest.isa-geek.org |
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