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Home✈️Aircraft🚁HelicopterThunder TigerOther › Tail belt tension affecting one way bearing?
09-10-2006 04:26 AM  14 years ago
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HotsHabit

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Idaho

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Tail belt tension affecting one way bearing?
I have been having problems with my one way bearing locking up, it is about 5 gallons of fuel old. I took it out and soaked it in ATF for 2 days, and installed it back in the Raptor 50. Before I put the tail belt on the drive pulley I was spinning the head admiring how smooth it was now after the oil soak.

I hooked up the tail belt and tensioned it up by holding onto the tail and letting the weight of the heli set the tension. After everything was back together I spun the head again and noticed the main (gray)gear would grab and spin for about 180 degrees then would let loose for another 180 degrees. I noted that the belt tension had a direct effect on this as I loosened the belt a little bit and everything works as it is supposed to now.

Is this common on the Raptors or is my one way bearing taking a crap?
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09-10-2006 04:53 AM  14 years ago
skyad

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possiblity when u tightened the lower jesus bolt u warped the one way by making it to tight now the little bit of tension from the belt makes it grab ??
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09-10-2006 04:56 AM  14 years ago
HotsHabit

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I am very careful when tightening the jesus bolt so I wouldn't think that could be an issue. That also crossed my mind when I noticed what was happening and loosened the jesus bolt just for $hits and giggles, it made no difference at all.
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09-10-2006 04:58 AM  14 years ago
HotsHabit

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Just to clarify, I backed off the tension maybe 2mm from were it was when I suspended the heli from the tail boom when setting the tension.
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09-10-2006 05:04 AM  14 years ago
skyad

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sudbury,on,ca

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check the roundness of the collar on the one way ,once its warped back off the bolt now won't make a difference.
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09-10-2006 05:14 AM  14 years ago
Arctic

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Flying Field

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Hi HotsHabit

I would say it's common. I had the same problem as you, but after lubing the one-way with ATF and using less belt tension, the gear would not grab and I have not had the bearing lock up again. I have now flown it for over a year without any problems.

Be the change you wish to see in the world. (Gandhi)
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09-10-2006 01:53 PM  14 years ago
SC Raptorman

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South Carolina

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I chased the same problem and found out loseing the belt tension alittle my one way lock ups were gone .There is a fine line on the one way locking up with pressure on it , if you have made sure the one way is lubed and the Jesus bolt is not too tight first.
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09-10-2006 06:20 PM  14 years ago
Slowpoke

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Dublin, OH

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HotsHabit,

very interesting post. I've been chasing a problems with breaking tailcases on one of my 50s - 5 in the last month or two, and I'm wondering if this could be a problem on mine, that something is causing the belt to grab or snag. What are the symptoms when the one-way is acting up? Does it make any strange noises? Sometimes I'm getting a clattering noise when spooling down or at the very start of spoolup. There's not much left on this heli I haven't replaced.

Doug Roberts
Dublin, Ohio
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09-10-2006 06:42 PM  14 years ago
HotsHabit

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Idaho

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I just kept noticing that the one-way was locking up quite frequently, I would break it loose and it would be fine for a few flights, then lock up again. It really didn't make any noise being locked up except when it was spooling down you could hear that the main gear was meshing with the pinion gear.

After I got thinking about it, there is a lot of pressure pulling the bottom of the main shaft (and the one-way clutch) towards the tail boom. By design this can easily cause problems in the one-way even with everything being perfect. Throwing a little too much tension on the tail belt will make this problem accelerate in my opinion. A bearing on the bottom of the main shaft might have helped with some problems we are having with these machines.

As far as you blowing out tailcases, belt tension may be somthing to reconsider.

I know that from now on I won't be running my belts as tight as I have in the past.
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09-10-2006 09:29 PM  14 years ago
Slowpoke

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Dublin, OH

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Thanks for the reply, I'm waiting for another batch of cases to come in, and I'll watch the belt tension closer.
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