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HomeAircraftHelicopterThunder TigerRAPTOR 90 › Drive shaft question
03-03-2008 04:59 PM  10 years agoPost 1
PAHelinut

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PA USA

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I'm about finished with my Raptor 903D build and I noticed when I spin the head by hand the boom seems a little noisy. The install of the shaft went fine. I glued the bearing to the shaft and pushed it down the boom. This is my second build up of a Raptor 90 as my other R90 went into a scale fuse. I also have built 2 R60's and have never had any issues. Funny thing is I didn't notice the noise until I installed the new open tail case from heli proz but maybe it was there. Is there anything I can do to try and quiet it up?

I did notice if I make the gear mesh in the tail a little looser by taking out 1 of the 2 shims it gets louder. With the 2 shims installed the gear mesh is perfect and it is quieter but still louder than I like. Maybe I'm beign too anal.

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03-03-2008 05:18 PM  10 years agoPost 2
Kinger

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Granville, OH

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Gears in an open case I would think will be louder than gears in a closed case.

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03-03-2008 05:24 PM  10 years agoPost 3
PAHelinut

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PA USA

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It's not comming from the case though it's comming from inside the tube. When I hold the boom in that spot I can feel it also. The only thing I can think of is I didn't oil the bearing before I installed it.

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03-03-2008 05:28 PM  10 years agoPost 4
Drunk Monk

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Preston, UK

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I think this might be why some people put an extra bearing on the shaft, to even it out a little more. I've always had an extra one on mine and it sounds fine. Was the bearing a tight fit in the boom? did you make sure you didn't get glue in the bearing and the whole thing is rotating in the boom? just a thought


Stephen

I only open my mouth to change feet.....

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03-03-2008 05:35 PM  10 years agoPost 5
Billebob

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Tim-buck-2

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Take the gear case off and listen and feel with the boom removed from the helicopter, look down the boom to make sure the bearing hangars are positioned correctly in the boom. Make sure equal length of splined adaptors prodrude out each end of the boom. Then set the rear tail gearbox mesh correctly and if all's well don't worry about it any further. There is absolutely no need for a third bearing.

BB

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03-03-2008 05:52 PM  10 years agoPost 6
Drunk Monk

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Preston, UK

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Oops, my fault I forgot mine was upgraded from a 60 which only had 1 bearing I still suspect you may have a little glue in the bearing and the whole lot is rotating in the boom.


Stephen

I only open my mouth to change feet.....

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03-03-2008 05:57 PM  10 years agoPost 7
PAHelinut

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PA USA

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The bearings were a very very tight fit no way at all the whole assembly is rotating in the boom. I did rotate the head with the tail removed and it seemed quiet. I'm going to remove the boom and make sure I have equal lengths and maybe shoot some tri flow oil down to the brearings.

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HomeAircraftHelicopterThunder TigerRAPTOR 90 › Drive shaft question
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