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HelicopterMiniature Aircraft Whiplash & Fury 55 › New Furioun and Surge Made in US or somwhere else???
09-04-2009 04:42 AM  8 years agoPost 21
jphilli

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Atlanta, Ga.

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I'm uncomfortable with the way MA is now using PEM nuts to make the graphite bellcranks. The force of the servo/swash is applied at right angles to the PEM nut which is incorrect. One only has put a bolt into a PEM nut and wiggle it a little bit back and forth to remove the PEM nut. This is not an arrangement I want on a mission critical application like a bellcrank.

PEM nuts are fine when the force is applied 180 degrees to the PEM nut (i.e. trying to pull the PEM nut into the CF), but placing a force at 90 degrees to the PEM nut is how to make the PEM nut come out. The PEM nuts are only press fitted into the CF.
You do realize that the normal forces to the ball link are high enough that they don't allow for the transmission of perpendicular movement?

I assume when you wiggle the bolt to release a PEM nut, you don't actually tighten the head of the bolt against the CF?

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09-04-2009 04:51 AM  8 years agoPost 22
Justin Stuart (RIP)

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Plano, Texas

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I assume when you wiggle the bolt to release a PEM nut, you don't actually tighten the head of the bolt against the CF?
The diameter of the ball is only slightly greater that the hole of the PEM nut. I just don't feel it is a good design. I prefer the aluminum.

Avant RC
Scorpion Power Systems
Thunder Power RC
Kontronik Drives

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09-04-2009 05:40 AM  8 years agoPost 23
jphilli

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Atlanta, Ga.

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I assume when you wiggle the bolt to release a PEM nut, you don't actually tighten the head of the bolt against the CF?
The diameter of the ball is only slightly greater that the hole of the PEM nut. I just don't feel it is a good design. I prefer the aluminum.
What I was trying to convey is that as long as the ball is tightened against the pem nut, then there's no way for the PEM nut to wiggle free. It's really not a bad design.

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09-04-2009 03:07 PM  8 years agoPost 24
Carey Shurley

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Orlando, FL - USA

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Otherwise, I'm confident there are aftermarket manufacturers who will be more than happy to take over the production of CNC replacement parts for MA helis starting first with the introduction of some high quality aftermarket CNC metal tail rotor blade grips. In fact, I know someone who is working on that problem as we speak
well the good news is that FlyCo has their own machine shop, so they can manufacture anything they want in any quantities they want. The other good thing is that they now have a full complement of corporate resources behind them to help protect their product lines and investments.

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09-04-2009 03:14 PM  8 years agoPost 25
CNCjunkie

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Kauai (The Garden Isle), Hawaii - USA

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Does someone have any images of the graphite bellcranks they could post?

Just another crappy day in Paradise....Aloha!

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09-04-2009 04:05 PM  8 years agoPost 26
Knud Pedersen

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Denmark - Europe

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Here is a picture of the MA Cf bell Crank on my Stratus High Ratio.

I'm uncomfortable with the way MA is now using PEM nuts to make the graphite bellcranks. The force of the servo/swash is applied at right angles to the PEM nut which is incorrect. One only has put a bolt into a PEM nut and wiggle it a little bit back and forth to remove the PEM nut. This is not an arrangement I want on a mission critical application like a bellcrank.
I have flown with these CF Bell Cranks for over a year, on both my Stratusses, and they are still perfect.
I do ALOT of pitch pumping, stops and Crack stuff, and i have 8717 (6v and 8V) in my stratusses.
No issues/problems with the PEM in the crank...

ChopperKnud
Team Miniature Aircraft
ThePitchbrothers

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09-04-2009 05:44 PM  8 years agoPost 27
lfalsetto

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COLORADO

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From what I understand Carbon fiber doesn't suffer stress like metal would. Plus it is lighter.

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09-04-2009 05:59 PM  8 years agoPost 28
CNCjunkie

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Kauai (The Garden Isle), Hawaii - USA

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Thanks for the pic Knud Pedersen

I wouldn't have a problem installing them on my Spectra-G if I hadn't already purchased the CNC bellcranks a while back.

A metal washer under the ball would ease my mind about the ball pulling through.

Just another crappy day in Paradise....Aloha!

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