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04-26-2009 03:58 PM  9 years agoPost 1
PBusch

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Minnesota

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Still building my HR Stratus and am at the part where you line up the crown and tail pinion gear. My concern is the amount of noise these gears make when spinning by hand on the bench. No matter how tight or loose I have them set it makes a grinding noise and I can feel a vibration in the frame just from spinning it by hand.

Is that normal, do I put some grease on the crown gear, or do I just not worry about it and let it wear in?

Right now I have the gears lined up and as close as I can get them at the high spot.

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04-26-2009 07:45 PM  9 years agoPost 2
jphilli

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Atlanta, Ga.

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I would always pull up on the head block and push down on the bottom main shaft collar then tighten the bottom collar's grub screw. Then I would push down on the head block and pull up on the top collar while tightening its setscrew. The mesh in the crown gear and tail pinion gear will be a bit tight but wears in perfect after a flight.

IIRC this is also what Bobby does.

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04-27-2009 12:17 AM  9 years agoPost 3
PBusch

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Minnesota

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Does yours make a lot of noise when you spin the head by hand?

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04-27-2009 01:01 AM  9 years agoPost 4
jphilli

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Atlanta, Ga.

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I wish I remembered well enough to be able to tell you as I sold that particular heli about 2 months ago. It may have made a little noise, but I know I'd remember if there was a lot of noise. Honestly though, I'd go ahead with the assembly and just make sure the mesh is a bit on the tight side and then get a few hover flights in. If something went wrong with the crown gear (which I doubt would happen) it'd be easy enough to auto the heli in. And after a flight or two, it is pretty easy to tell if the gear is still noisy. Wouldn't hurt to grease the gear for the first flight as well. I've always done this with new crown, main and tail gear on my MA machines although I've noticed not many other MA pilots do.

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04-27-2009 02:08 AM  9 years agoPost 5
PBusch

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Minnesota

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Thanks, I think the way I have it set is pretty much perfect. I didn't put any grease on the gear though, I'll put Tri Flow on.

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