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HomeScaleAircraftScale HeliScale Helicopter Main Discussion › Extreme mechanics grounding?
12-05-2012 05:09 PM  6 years agoPost 1


Truro, MA

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I've having some issues with the HC3x in my Extreme mechanic electric powered Vario EC145. I've had some good flights and am
still dialing in the helicommand. The last few flights I'm starting to get some mostly fast tail "hits" and occasional head
"hits". They result in some jerky swings of the tail and head.
I wouldn't label them as oscillations, just momentary movements.
There is alot of belts producing static in the extreme mechanics,
anyone had issues with them?? I'm still ruling out other causes,
but that is one I want to address also. If you've had to ground the mechanics, how did you do it??
I've mostly ruled out a slipping shaft coupling etc. and have increased the resolution of the tail servo by moving the ball link in a hole on the arm.
Any thoughts?
Thanks, Adam

12-05-2012 05:15 PM  6 years agoPost 2
Adam Tashjian


Boylston, MA (the pay state)

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in the instructions there is a picture of a ground wire they want you to make that goes on the frame and one of the bearing blocks i believe. They even give you the material to make it.

12-06-2012 04:09 PM  6 years agoPost 3


Truro, MA

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Adam, thanks, Adam

no but really...I went thru 2 versions of assembly instructions and
no ground wire in diagrams. I'm just going to ground from bearing block to block and then to motor mount? Should that work?

12-06-2012 07:11 PM  6 years agoPost 4


Muncie , Indiana , USA

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I had a grounding problem with my 700 , I did the same grounded the tail rotor shaft through the bearings to the boom than the boom to the frame , main shaft through bearing , the motor mount , and finally to the negative side of the battery.

This fixed my problems I were having which were very similar to yours , where the tail and head had more of a jerk at times.

12-11-2012 05:12 AM  6 years agoPost 5
Joel Rosenzweig


Marlborough, MA - USA

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My Extreme mechanics for my EC-135 did not have a grounding strap. Maybe that was added to a later revision of the mechanics. That said, I never had any problem with static build up, or more importantly, any glitching due to static build up.

The MAXI-JOKER uses a grounding strap, and it really is necessary there. It has a belt going from front to rear, and the carbon fiber tail boom is isolated electrically from the main frames. So a piece of wire is used to connect the boom to the mechanics frames, so continuity is ensured.

Sooo.. there's really no equivalent problem with the Extreme mechanics though. Yes it uses belts, but, nothing that goes back to the tail boom.

Of course, if you want to ground the tail boom to the frames, no harm done. I'm just not sure that's really going to change anything for you.

I think I'd "try" the grounding strap, then if that doesn't work, be prepared to look for frayed wires. Also, make sure your receiver is not too close to your HC3x, and also is not too close to your ESC. All three devices emit noise, and as much as I'd like to believe the 2.4GHz radio is not affected by these sources, well, they are. The RF front ends can be overloaded by the noise from other devices when they are too close. Glitches can happen from this, and it has happened to me when my SK-360 was too close to my XPS receiver.

What's too close mean? Right next to each other is bad. Isolate them by 3-4 inches at least.

I hope you figure it out. And if it's just a grounding strap, well, at least it was an easy fix!


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