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T-REX 500 › Main Gear Question
10-25-2012 03:39 PM  6 years agoPost 1
aland25

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US

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I was doing to basic hovering last night and noticed that my heli had very little lift and started to fall back to the ground. Regardless of power input, I received little lift. Finally the motor was at full power, however the rotor blades were not turning.

I realized that the motor pinion was not meshing with the main gear at all. The main gear looked to be chewed up pretty good. I was wondering how this could have happened. Perhaps the pinion was not as close to the main gear as needed?

Thanks for any guidance.

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10-25-2012 04:00 PM  6 years agoPost 2
Helishelter

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Midwest, USA

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Main gear
Take a look at the gear mesh on any part of the main gear that still has teeth left on it. That will give you some insight as to what the gear lash was before it stripped. Check the motor mount bolts and make sure they are tight. If all looks good, then maybe, there were some stripped teeth on the main gear from a previous crash. Had it been crashed before?

Team Mikado USA

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10-25-2012 04:33 PM  6 years agoPost 3
aland25

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ok, i'll check. There was no crash (yet)

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10-25-2012 07:20 PM  6 years agoPost 4
jschenck

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La Vista, NE.

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you have the helical cut gears in there - true?

The way I set mine was to get the pinion as close to the gear I could, pressing the pinion/motor against the main gear while tightening down the motor in the mount with a piece of paper between the pinion and motor. paper came out tightly accordion'd up. The pinion to main gear was very tight, don't think I could measure the backlash/play but there was just a very small amount of movement I could see on the pinion before it'd start moving the main gear as viewed from above when twisting the motor back and forth. point is there is as little gap as possible but still have some gap. Mine has been through 2 crashes now, gear is holding up well.

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10-29-2012 09:31 PM  6 years agoPost 5
aland25

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US

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I do have the helical gears and set up the replaced part as you described below. Everything works great. Thanks for the tips.

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