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Home✈️Aircraft🚁HelicopterAlignOther › 3 sets of new tail drive gears - all bad?
08-04-2007 10:31 PM  13 years ago
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creightoncarr

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Missouri City, Texas - USA

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3 sets of new tail drive gears - all bad?
I just received 3 sets of the nitro (gray) tail drive gears from readyheli. I installed a set and when I spun the main blades by hand a noticed resistance. It would get tight, then loose, then tight again as I spun it. Turns out the round tail drive gear (the lower gear on the shaft) was not turning true. When I pulled it out to inspect it, it appeared that the problem was caused by the hole for the shaft not being directly in the center of the gear. Since the gear was not spinning on its center axis, the mesh with the autorotation gear was either way too tight or way too loose as the gear spun. I pulled out one of the other sets I received to use instead and it was affected by the same problem. So was the third set. Bad batch? Anyone else have this problem with the new gears? The gears that came with my kit were fine. Just curious. I plan on exchanging them, but if there is a bad batch of the gray gears I will just get the white ones.
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08-05-2007 12:50 AM  13 years ago
Nashville

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Formerly Music City now back home in Sunny Florida

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now that you mention it, I've noticed a little bit of that with the new gears I put in. There is definetely a high and low spot on the rear gears. It's not too bad, but not as smooth as the gears that came with my set.I was Spektrum when Spektrum wasn't cool
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08-05-2007 01:17 AM  13 years ago
3D WASP

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I've got 7 sets of front tail gears. Every last one of them is bent. All of the flat gears (that run up against the big autorotation gear) are not on the shaft straight. They all orbit around the shaft and cause a vibration, not to mention a nasty noise say around 100rpm. The bevel gear that the torque tube goes into is not centered either. This causes a terrible vibration as you could imagine when the tail is spinning at 10,000 rpm. I've got the best combo I could come up with in the heli right now and it still vibrates like a motha F#$%er. This all after I made a custom torque tube out of a synergy torque tube. Why the custom torque tube? You guessed it, two brand new ones bent, right out of the packaging. I think they had too tight of press with tt ends, so when they pressed them in it bent. These 7 sets of gears came from 2 different hobby shops, I think I've got 5 sets of gray and 2 in white. The torque tube I could fix myself, but these gears you can't really do anything with. I've got the gyro mounted in the back, and at 29% the tail wags due to all the vibration. I'm going to move it to the front on top of the servos to see if that gets rid of the wag. Which is only a disguise, I really wish I could just go buy a straight set of gears and a TT that was too straight. But I'll have to wait til my LHS' get some more in stock, who knows maybe those parts will be from a different batch and they'll be straight? I can only hope.
Also, not to go off topic, but my main bearings dont fit the main shaft to well either. With everything tight I can rock the main shaft front to back. Two new main shafts and new bearings and I get the same thing. The tolerances are just off a hair, but thats all it takes. And I'm sure its not helping my tail wag. Other than that this heli kicks A$$, awesome practice helicopter.
Timing is everything
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08-05-2007 02:02 AM  13 years ago
drdot

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So. California, Orange County.

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Easy fix....Loosen the main bearing blocks...Loosen the tail box mounting screws...Find the High spot, then inset a strip of one of the plastic packing bags between the two gears in question at that spot...Then tighten the main bearing blocks a little at a time making sure the main shaft will fall into all three bearings of its' own weight...then tighten the tail box screws...frame will now be straight where it counts, and the gear mesh will be ok...

John.
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08-05-2007 02:58 AM  13 years ago
FlaHeli

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Jacksonville. Fl-USA

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Just more bad parts being put out on the market. I am questioning everything after finding my parts being labeled as the new part but just more of the same old bad ones.
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08-05-2007 03:42 AM  13 years ago
Ken Filloon

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Highland, Michigan

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My gray tail drive gear also was not spinning true. I replaced it with the white one.
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08-05-2007 03:52 AM  13 years ago
3D WASP

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So I just went and put 4 tanks through it with the gyro mounted up front. I was able to increase the gain to 33% with no wag in high speed hurricanes. Good disguise puting the gyro up front.Timing is everything
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08-05-2007 12:38 PM  13 years ago
creightoncarr

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Missouri City, Texas - USA

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Easy fix....Loosen the main bearing blocks...Loosen the tail box mounting screws...Find the High spot, then inset a strip of one of the plastic packing bags between the two gears in question at that spot...Then tighten the main bearing blocks a little at a time making sure the main shaft will fall into all three bearings of its' own weight...then tighten the tail box screws...frame will now be straight where it counts, and the gear mesh will be ok...
Problem is, mine are so out of true that if I did adjust the mesh for the high spot, the mesh on the other side would be so loose I would worry about it slipping or gnawing the teether apart at the speeds they spin.
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08-05-2007 03:51 PM  13 years ago
drdot

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So. California, Orange County.

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fwiw..

That is a judgement call,,,I'd look a different auto drive gear, but the mesh on the t/r drive can be pretty sloppy and still not cause problems...It's a feel thing...If you have any freeplay at the high spot, you should be good to go...

John.
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