RunRyder - Grounding the Tail Boom

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e-Minicopter Joker > Grounding the Tail Boom

pyaresquared
Senior Heliman
Location: Central Arizona

I have to replace the tail boom on my MJ2. (Don't ask

). You know, I really like the design of everything on the MJ2 except for that bloody grounding screw. I have eliminated it on my J2 by clamping a brass ring on the boom at an area where I removed the anodizing.

I am trying to come up with a similar approach for the MJ2. Any ideas? I am thinking of taking a punch to a brass clamp to make a couple of sharp points on the brass and then carefully scratching a couple of holes through the resin coat on the CF under the points to allow the brass to make electrical contact.

Not coincidentally, I have a piece of tubular CF that has the exact dimensions of the MJ2 boom on which I can practice.

Regards,
Steve S.

Surfin' the gravity waves

01-24-2008 06:11 PM

fergus
Veteran
Location: Ireland

Sounds like it would work to me.

Regards

Fergus

Regards

Fergus

01-24-2008 06:31 PM

Thuvanduc
Senior Heliman
Location: Salt Lake City, Utah

Get you a Spectrum Radio, then you do not have to worry about this any more.

01-24-2008 07:23 PM

fergus
Veteran
Location: Ireland

I have heard people say that a few times about 2.4gHz but I have a problem understanding it. Would a large static discharge not effect electrical components irrespective of the radio band being used?

I can't see how 2.4gig helps if the interference is not through the receiver aerial. Can't the servo wires or ESC wires act as an aerial as well? Why else do we use ferite rings on ESC wires even on 2.4gHz.

Someone with knowledge of this set me straight please!

Regards

Fergus

Regards

Fergus

01-24-2008 08:02 PM

Thuvanduc
Senior Heliman
Location: Salt Lake City, Utah

72mHz vs. 2.4gHz, that the different. Mechanical vibration or electrical static vibration will never get high enough frequency to cause interferences. You can eliminate the ferite ring on the ESC as well when using spectrum.

01-24-2008 10:17 PM

tabbytabb
Elite Veteran
Location: seattle

I just put a small bolt right through the boom rather then trying to go through the boom block also. THis makes adjustment and removal of the tailboom much easier IMO

Tabb

01-25-2008 02:01 AM

HOMEPAGE

rroback
Key Veteran
Location: Irvine (UCI), Ca

just sand the anodizing, and tape some wire, and take it to the bottom, and around a bolt on the frame. I do that, and has the stupid screw there, just in case.

Rhett... There's no power like E Power!

01-25-2008 04:42 AM

ehx
Senior Heliman
Location: Northern Minnesota

You can use any method mentioned here to ground the tail. As long as you get a zero (or close to it) ohm reading between the tail rotor housing and a bolt on the frames you will be fine.

The stock grounding bolt is a bit of a pain to get at. I finally bent a ball-end driver and if you tape the bolt to the ball-end it fits under the belt nicely and can be put through the hole without much trouble.

Do ground the tail though. No receiver is immune to the type of spark the tail can generate. Think of the worst static electricity shock you've ever experienced. That will scramble any receiver's brains. You may not get a real powerful spark every flight and/or it may not enter the heli's electronics, but without a ground you are playing Russian Roulette. Be it flight 5 or flight 75 a bad spark could, and probably eventually will, shutdown your receiver. The frequency the receiver works on is irrelevent.

01-25-2008 07:16 AM

fergus
Veteran
Location: Ireland

Thats where my logic was leading me Ehx thanks for confirming it. I could not see how radio frequency mattered where a large static discharge was concerned.

Regards

Fergus

Regards

Fergus

01-25-2008 08:11 AM

pyaresquared
Senior Heliman
Location: Central Arizona

Quote
just sand the anodizing, and tape some wire, and take it to the bottom, and around a bolt on the frame. I do that, and has the stupid screw there, just in case.

My MJ2 tail boom is CF. Is an anodized aluminum boom available for the MJ2?

Regards,
Steve S.

Surfin' the gravity waves

01-25-2008 06:05 PM

tabbytabb
Elite Veteran
Location: seattle

Yes, and it works better then the Carbon one.

Tabb

01-25-2008 06:06 PM

HOMEPAGE

QueeQueg
Senior Heliman
Location: West Texas

When I had a problem with a boom glitch is was actually affecting the ESC and not the RX. The motor would momentarily stop and start every 20 or 30 seconds. It was definately the boom doing becaus I could see the arc after dark. The connection was no good enough in my case. I improved it and it went away.

I lost no control or had any indication of a glitch on any of the other servos only the throttle.

So even 2.4 is gonna get it. I saw a TRex that had a boom glitch with both 72 Mghz and 2.4 Ghz. The Spektrum RX did nothing for it!!

I use them and love em but they're not impervious.

01-26-2008 12:28 AM

pyaresquared
Senior Heliman
Location: Central Arizona

Here's what I came up with. I soldered an 8-32 brass nut on a brass strip and shaped an 8-32 bolt so that it has a pointed tip. There is a hole in the brass strip under the bolt. The bolt punches through the CF (drill a tiny pilot hole first) and grounds the clamp to the CF. Resistance between the clamp and the boom is less than one ohm. The clamp can be taken on an off without removing the boom.

Regards,
Steve S.

Surfin' the gravity waves

01-26-2008 12:43 AM

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e-Minicopter Joker > Grounding the Tail Boom

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