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HomeAircraftHelicopterMain Discussion › Trex 500 ESP Shakes itself into a crash. Help
12-04-2012 03:54 AM  5 years agoPost 1
helihogz

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wa

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Just installed an msh brain on this heli. Was test hovering. After about 3 seconds with training gear on. The heli started shaking so violently i lost all control and it crashed. It was shaking BAD and i mean BAD.

The bird has a tracx head. All shafts are straight bearings are tight. I bought this used and this is the first flight. Im running the stock pitch and throttle curves suggested in the manual.

pitch in normal
-2,0,5,8,12

Throtle curve
40,70,85,100

Now ive read that the trex 500 likes headspeed. But would this cause it to crash? Could low headspeed with training gear caused the problem. Or maybe an msh brain issue.

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12-04-2012 05:07 AM  5 years agoPost 2
AWittleWabbit

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O.C., CA

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I don't know the MSH brain at all but it sounds like you had the gain(s) too high. Is there someone nearby that can help you?

Heli-itis sufferer.

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12-04-2012 05:18 AM  5 years agoPost 3
Solmanbandit

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Tucson , AZ

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Do you know what head speed you are running? That could definitely be a problem. If you don't, list the pinion gear, main gear, battery cells, motor KV.

Trex 700E / Trex 500 ESP - Ikon/ HD 500 - Ikon 2/ Goblin 500 Ikon 2

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12-04-2012 11:33 AM  5 years agoPost 4
helihogz

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wa

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Im using 2- 2250 3s turnigy packs in series. Main gear 162 tooth. Pinion is 13. Stock align motor 1600kv (RCM-BL500MX).The tail is belt driven.

The shaking is like a resonance. Rocking from left to right getting more severe till it throws itself into ground.

Im on my own here. No one around here into rc.

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12-04-2012 05:29 PM  5 years agoPost 5
BeltFedBrowning

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Kansas City

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The training gear itself has been known to cause it too.

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12-04-2012 05:31 PM  5 years agoPost 6
Solmanbandit

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Tucson , AZ

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I think I know what your problem is. The belt drive. Static electricity can be a problem on heli's with FBL systems. Logo's are known for this problem and I had the same exact problem recently when I temporarily switched my Trex 600E to belt(financial reasons). It would do the same thing every time and then I switched it back to torque tube and the problem went away. I never had a problem with belts when I had a FB head, but definitely did with FBL. If this is your problem, there are a few fixes.

1. Make a ground for your belt drive.
2. Spray static guard on your belt
3. Convert to torque tube.

BTW, I believe most people use either 2600 or 2800 mah(6S)batteries on a 500 size heli.

Trex 700E / Trex 500 ESP - Ikon/ HD 500 - Ikon 2/ Goblin 500 Ikon 2

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12-04-2012 05:47 PM  5 years agoPost 7
JuanRodriguez

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The Villages, Florida

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I would agree that the training gear and induced oscillations as a result caused your issues.....

Years ago I was helping a newbie trim out a Nexus with training gear attached and the oscillations were so great that I could not hover it. Took the gear off and the heli was smooth as silk.....

Been there, done that and old enough to know better.....

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12-04-2012 06:11 PM  5 years agoPost 8
helihogz

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wa

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Thanks everyone. The mod has already been done to the tail with the ground wire. Im getting good continuity from tail to motor mount.And the belt was lubed with silicone before first hover.So im sure its not that.

I was thinking maybe the training gear also. I can hover,do circuits and fff. I just had it on there for the brain setup. I guess i can give it a try without. I will post back with the results.

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12-04-2012 06:13 PM  5 years agoPost 9
Solmanbandit

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Tucson , AZ

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It is possible that the training gear is posing an undo vibration. I haven't heard or seen anyone use training gear on a FBL heli.

Trex 700E / Trex 500 ESP - Ikon/ HD 500 - Ikon 2/ Goblin 500 Ikon 2

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12-04-2012 06:49 PM  5 years agoPost 10
John in Atlanta

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Atlanta, GA, USA

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How is the tracking?

Could be a bent feathering shaft.

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12-04-2012 06:55 PM  5 years agoPost 11
lsnover

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Lehigh Valley, PA

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Training gear can definitely cause issues, especially at certain frequencies.

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12-04-2012 07:54 PM  5 years agoPost 12
helihogz

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wa

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Im happy to say. WOOHOO. It WORKS....Removed the training gear and this thing lifts off and hovers stable as could possibly hope for.

No shakes no drift. Just smooth sailing. Thanks guys for your help.

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12-04-2012 09:16 PM  5 years agoPost 13
jschenck

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La Vista, NE.

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I've run two 3S 2200 packs on my Trex-500 several times, it works for me. I'm sharing some packs between my 500 and my 450. I'd suggest taking at least 30 seconds off your flight time compared to a 2600 6S pack.

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