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HelicopterThunder TigerOther › R60--stripped main gear-need help
09-12-2007 12:30 PM  10 years agoPost 1
robb

rrApprentice

Vienna, MO

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Was trying to break-in my new OS70 on my new Raptor 60 last night, and my main gear stripped about 30 feet in the air. I managed to save it by auto'ing it in, but it just makes me mad. I had an awful time getting the gear mesh just right, but apparently it wasn't good enough.

Any idea why it did this? Too loose? Too tight? I just ordered 2 extra main gears and one pinion gear but would like to know what I need to do to get this to work right. Again, I thought I had it figured out, even sought help at the Columbia, MO funfly several weeks back, and they helped me set the gear mesh (paper method). I never had a problem with my Titan main gear, so why am I having a dicken's of a time with this beast?

Any help would be appreciated. I would like to see this fly as good, if not better, than my Titan.

Thanks,
Rob

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09-12-2007 12:44 PM  10 years agoPost 2
S Bell

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Nova Scotia Canada

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I'd have a look at the pinion incase it's distorted. That's the only reason it will strip in flight if the mesh is correct. With minimal lash it should run freely and smoothly. I have seen the results of guys using pliers (and not suggesting this is your case)on the pinion teeth when they screw it into the bell cause problems, best to use the nut flats on top of the pinion bearing. I like to run them with the minimal gear lash. If there is one tight spot on the gear rotation (or the tightest point) it will get zero lash but also not be loaded excessively. That high spot will wear in. The engine needs to be parallel to the clutch bell and the pinion parallel to the main gear. If you satisfy these conditions the gear will last hundreds of flights. I tend to check the lash by holding the main gear and rocking the clutch bell, it gives a more sensitive indication.

Stephen

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09-13-2007 02:02 AM  10 years agoPost 3
robb

rrApprentice

Vienna, MO

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Figured out my problem while tearing down the main mast and gear area so I can replace them: the nut that sits ontop of the bearing on the pinion gear was VERY loose, thus causing the clutch bell to move back and forth after I removed the stripped main gear. DOH! So now, I just have to wait til Heliproz delivers my new main gear and pinion gear...should be here on Friday!

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09-13-2007 11:27 AM  10 years agoPost 4
S Bell

rrApprentice

Nova Scotia Canada

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Use loctite sleeve retainer or similar between the bearing inner race and the pinion plus thread locker on the nut. That way you won't need to worry about anything shifting when you begin pounding the extreme snot out of the helicopter

Stephen

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09-13-2007 10:05 PM  10 years agoPost 5
bmw

rrApprentice

Lake Zurich U.S.A.

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Glad to hear to figured out the problem with the gear I've got two 60's and when I read your post I could not think what would have caused that
Like S Bell said if your gears were lined up that should not of happened. That O.S. 70 is a good motor and I know your going to like it just hope it lives up to your expectation of doing better then your Titan, remember the 60 is bigger and heavier.

Runway? what runway??

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09-13-2007 11:00 PM  10 years agoPost 6
robb

rrApprentice

Vienna, MO

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BMW,

Thanks for the reply. I gotta say, I really love that Titan. I have it dialed in so good it is just like riding on rails! Since this is my first 'big' heli (over a 50 size), I hope it flies as well as my Titan. My parts should be in tomorrow, and I'll put it back together then. I think the hardest part will be to try to get that pinion/clutch bell/bearing block assembly back in. I didn't tear the frames apart, just loosened up the collective assembly and moved it out of the way.

Thanks for everyone's help. I'll post back when it is put back together.

Cheerios,
Rob

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