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HomeAircraftHelicopterThunder TigerRAPTOR X50 › X50 Tail spindle failed
10-12-2012 04:01 PM  5 years agoPost 1
halburn

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Powell, Ohio

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I have a question. I have a X50 torque tube FBL. I love it by the way. I bought e Heli used, I did not completely disassemble it as I should have. I noticed that the tail drive gear transmission in the frame was notchy as it rotated. Like the gear mesh is too tight. I did not see anyway to adjust the mesh. I did try and adjust the tail boom, no change, it is clearly the mesh of the gears that feel slightly notchy, not terrible, just not smooth. That being said, I was fly and the tail let go, I found the Heli with no tail blades. The spindle had sheared at the hub root on both blades. Is this an issue others have had? We're the grips over tightened? Should I go to KBDD light weight blades? I had rails on. Do I need to fix the mesh? As I spin the blades by hand, the roughness is not as noticeable as the rpm's increase.
Thanks for any suggestions.
Mark

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10-12-2012 04:12 PM  5 years agoPost 2
Skaluf

rrVeteran

Champaign, IL

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More than likely whoever built the heli put too many shim washers in the tail drive. You'll need to dissemble it to check on this.

On your other issue, are you saying that the bolts holding the grips on sheared? If so, no that is not an issue with the X50. They could have hit the ground or something else caused a failure. Rail blades are fine on the X50. Just mount them so they can move easily in the grips.

Steve

Steve Kaluf
Hobbico

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10-12-2012 04:28 PM  5 years agoPost 3
Adam Landefeld

rrApprentice

Lehi, UT, USA

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As was mentioned above, there could be too much shim behind the torque tube end gear in the tail gearbox (easy to check with the gear box off in your hand and just test for a tiny amount of backlash in the gear mesh, if none... reduce shimming).

Another thing to check for is simply correct torque tube positioning in the boom. It is possible to have it positioned too far to the rear and it will push that rear gear out slightly and make the mesh not feel "as good". Whenever working on this torque tube system, once it is all assembled on the machine, I "seat" both front and rear end gears into their bearing seats with a small bar to make sure the tube is "floating" in between them correctly.

On your output hub, it almost sounds like it was over-tightened and was pre-stressed. You can easily have one side shear and fly off that way and the resulting imbalance and vibration cause the other to shear as well, especially if they are both pre-stressed. (I've actually seen this exact thing happen on an x50)

Condolences on the ground overlap... good luck, great machine.

-Adam

Futaba Factory Team
Team FlightPower
Thunder Tiger

https://www.facebook.com/UtahHeli

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10-12-2012 04:29 PM  5 years agoPost 4
halburn

rrNovice

Powell, Ohio

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Good call on the spacers, the tail side is good, I will take the frame side apart and check. The tail spindle sheared at the hub. Not at the end where the nut is, I know! Crazy! They definitely broke in flight, not the crash. The crash only broke the gear, and one main blade. I got lucky. But the tail blades were gone, the tail shaft is not bent, and the gears are fine, no teeth missing. Thanks for the fast response.

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10-12-2012 04:32 PM  5 years agoPost 5
halburn

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Powell, Ohio

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Thanks Jedi and skaluf. I love this Heli.

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10-12-2012 04:42 PM  5 years agoPost 6
PJRono

rrKey Veteran

Minnesota, Ya!

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Make sure to shine a bright light on those tail gears and look for hairline fractures at the bottom of the teeth valley.

If you skip me I can't play!

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10-12-2012 04:50 PM  5 years agoPost 7
halburn

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Powell, Ohio

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Thanks pjrono, I needed that. I have not had a torque tube Heli before. Learning what to look for.

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