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T-REX 450 › What is this noise?
09-03-2013 02:50 PM  4 years agoPost 1
DavidLD

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Radcliff, KY

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Gear mesh or maybe gears/bearings?

Watch at YouTube


Dave
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09-03-2013 06:36 PM  4 years agoPost 2
DavidLD

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Radcliff, KY

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Youtube settings updated for anyone that was having problems accessing video. Thx.


Dave
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09-03-2013 06:44 PM  4 years agoPost 3
DemetriusUSN

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Virginia Beach, Va USA

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What noise, it seems normal for me. Is it a trex 450 or what?

Minicopter Diabolo 800, Minicopter Triabolo 700, Minicopter Diabolo 700, Minicopter 550,Compass 6hvu, Devil 380

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09-03-2013 06:48 PM  4 years agoPost 4
DavidLD

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Radcliff, KY

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Not sure the video is doing it justice. You can hear the actual sound closer to the end as it winds down, but in person, it's much louder and abrasive - sounds like the gears are about to grind out of the heli. Should I just throw some blades on and fly?

I'm completely new to electrics, so not sure if the gear mesh is set correctly etc.


Dave
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09-03-2013 06:57 PM  4 years agoPost 5
DemetriusUSN

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Virginia Beach, Va USA

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If the gear mess is correct with main gear and pinion, fly it. Sometimes the noise will quite down some after a few flights. Are the gears new?

Minicopter Diabolo 800, Minicopter Triabolo 700, Minicopter Diabolo 700, Minicopter 550,Compass 6hvu, Devil 380

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09-03-2013 07:17 PM  4 years agoPost 6
DavidLD

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Radcliff, KY

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I bought it used from RR classifieds. Gears are used. All of the electronics are new.


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09-03-2013 07:47 PM  4 years agoPost 7
DemetriusUSN

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Virginia Beach, Va USA

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Also a couple of guys on here use this dive grease for the gears, if you search you can find it, 1to lub the gears and 2 quites them down some.

Minicopter Diabolo 800, Minicopter Triabolo 700, Minicopter Diabolo 700, Minicopter 550,Compass 6hvu, Devil 380

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09-05-2013 01:00 PM  4 years agoPost 8
DavidLD

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Radcliff, KY

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Ok, now I need to ask a really dumb question about pinion placement. If you set the motor on a table with the shaft pointed upwards, I currently have the pinion mounted flush with the end of the shaft.

Should I drive the pinion all the way down the shaft, flush with the motor/bearing, leaving some of the shaft sticking out above the pinion?


Dave
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09-05-2013 01:29 PM  4 years agoPost 9
DemetriusUSN

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Virginia Beach, Va USA

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I make sure the main gear is in the middle of the pinion on the helicopter, not on the bench. After you get the pinion set, locktite the screw on the pinion and set gear mesh.

Minicopter Diabolo 800, Minicopter Triabolo 700, Minicopter Diabolo 700, Minicopter 550,Compass 6hvu, Devil 380

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09-05-2013 02:00 PM  4 years agoPost 10
knightofcarnage

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chicago

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Sounds like notchy bearings or motor going bad.

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09-05-2013 02:06 PM  4 years agoPost 11
wrongler

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Brewerton, New York

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If you think its a bearing making the noise, just put a little on one at a time and see if the noise goes away. Process of elimination.
If you can't find the noise, there may not be a problem, If there is a problem It will get worse as time goes on.

Bill Whittaker

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09-05-2013 03:01 PM  4 years agoPost 12
knightofcarnage

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chicago

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Grease you one one just in case.

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09-05-2013 06:51 PM  4 years agoPost 13
Waco

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Bernalillo, New Mexico USA

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If it's a used machine then I would take the time to remove the head assembly (Not that hard). Use a tapered tool (lead pencil will work) and check that each bearing turns smoothly. Lube each one after cleaning the bearing shield area. TriFlow oil works very well and give it time to wick through to the other side onto a bit of paper towel. Do this until the towel shows clean oil.
Pinion to main gear alignment both vertically and mesh-wise should be adjusted correctly. The noise sounds like it might be gear related.
Cheers, Waco

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09-05-2013 10:30 PM  4 years agoPost 14
DavidLD

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Radcliff, KY

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Thanks everybody, much appreciated! I'll give your suggestions a try.

dave


Dave
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09-06-2013 06:29 PM  4 years agoPost 15
DavidLD

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Radcliff, KY

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Just ordered a 'crash-kit' bearing set from rcbearings, new feathering shafts, main shafts, and dampers. This should put me in pretty good shape. /sigh, now the wait for parts.


Dave
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09-06-2013 11:44 PM  4 years agoPost 16
DavidLD

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Radcliff, KY

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Sounds like notchy bearings or motor going bad.
Excellent point. Since the motor is brand new, and with the sound happening on spin-up/down, would I be correct in assuming it would most likely either be the main shaft bearings or a torque tube bearing?


Dave
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