Trex 150 Swash plate + shaft bind issue - HeliFreak
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150 Class Electric Helicopters 150 Class Electric Helicopters manufactured by Align, Tarot, SYMA, Airhog, Chaos, HK and similar.


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Old 06-21-2015, 12:58 PM   #1 (permalink)
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Default Trex 150 Swash plate + shaft bind issue

Does anyone have any issues with the swashplate tilting into and actually "contacting/rubbing" against the shaft?

Test:
1.) Remove blade.
2.) Turn on and hold in hands.
3.) Move cyclic to any extreme position.
4.) Also, move left stick to either extreme up/down.
5.) Do you see the swash rubbing against shaft?

If you have plastic shaft this "binding" will force the inner and outer to seperate. Hmmm..sounds familiar? If you have aluminum shaft? This bind will literally cut it's own head!!! Look for a scoring or notching on the shaft.

I see absolutely no info on line about this. I suspect align's dirty little secret. I've played with limiting the dual rate, but no good.

Last edited by slamdance; 06-21-2015 at 02:36 PM..
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Old 06-22-2015, 01:49 PM   #2 (permalink)
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Your test are inaccurate.

You are telling the heli (which thinks it's flying) to roll at a certain rate. It can't roll with you holding it. The MSR unit sees this and applys full deflection trying to get the heli to roll.
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Old 06-22-2015, 09:58 PM   #3 (permalink)
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Simply checking maximum servo throw. Flight or stationary. There is a problem with my unit. I'm curious if others have the same problem.
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Old 06-23-2015, 06:55 AM   #4 (permalink)
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Your testing servo throw with the gyros activated.
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Old 06-27-2015, 12:13 AM   #5 (permalink)
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That is correct.
So you are telling me there is NO HARD STOP for servo travel?
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Old 06-27-2015, 07:44 AM   #6 (permalink)
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There is a tab on the final gear that is a key to align the output spline to the potentiometer pin.
If the pin in the potentiometer fails, the servo will spin constantly.No stop.
The potentiometer provides an electronic stop point.
Refer to this video on gear replacement.

LX1026-LX1027: T 150 SERVO - ULTRA METAL GEAR - USER MANUAL (3 min 37 sec)


In flight the servos never go to full deflection, very little movement is required to perform even extreme 3D flights. No matter the size of helicopter.

If you watch a cockpit video of full size heli pilots, the controls are hardly moving. Same thing with rc.

If the servos were to go full tilt, you will not be able to control the heli.
The max position would result in a crash.
HW.
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others just gargle.-Robert Anthony.
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