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HomeAircraftHelicopterMain Discussion › Carbon Tail Rotor Pushrod Blues
01-19-2003 10:58 PM  15 years agoPost 1
DMShanks

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Salt Lake City, UT

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In attempting to set up my brother's heli with a carbon tail rotor pushrod, it became apparent the stock wire push rod would take less servo energy to actuate. The problem is with the rod guide. Carbon is very stiff, and resists bending, which becomes a problem when using a pushrod guide midway on the boom. Are there any carbon or graphite pushrods that will function adequately without any guides? The whole idea here is to minimize slop and friction. Is the guide/guides only to keep the carbon pushrod from vibrating excessively? What is a typical setup? I wasted 20 bucks on my Century brand carbon pushrod. Thanks, Dave

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01-19-2003 11:21 PM  15 years agoPost 2
greg8705

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Orlando Fla

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carbon push rod
I have a carbon push rod on my hirobo shuttle 30 with no guides on it at all and it works fine. The tail has carbon fiber boom supports for a 60 that have been cut to fit as far back on the boom as possible and their is no vibations at all. The push rod made a big differnce it the way the tail held in the wind to, no more wagging from the rod flexing.

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01-19-2003 11:26 PM  15 years agoPost 3
FUBAR

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Sugar Hill ,GA

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On my Sceadu 50 I went to my local hobby shop and bought a carbon rod and some 4/40 rod ends. I beleive the carbon rod is made by Easton the same company that makes arrows. Cut the rod the desired length then epoxy the 4/40's on the ends. The whole setup cost me less than 5 bucks.


FUBAR

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01-19-2003 11:35 PM  15 years agoPost 4
3DGOnnabe

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UK

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I discovered an interesting problem with Carbon rods recently on a friend's Vigor CS. The rodhad bacomen thinned where it passed through the guides. This may have been due to friction/vibration but he quickly went back to metal...

I guess the lesson here is that everything needs to be checked regularly and lubricated correctly.

[color=blue]John[/color]

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01-20-2003 12:39 AM  15 years agoPost 5
fritzthecat

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Virginia Beach, VA

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The trick with the guide is to leave it loose enough to easily pass the cf rod but tight enough to prevent vibrations. I have mine set loose and slip some heatshrink tubing over the rod where is goes through the guide. About once every year the heatshrink gets replaced at which point it's just about worn through.

Fritz


'Send Money, Women and Guns!'

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01-20-2003 12:47 AM  15 years agoPost 6
z11355

rrMaster

New England

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MinAir sells pieces of heatshrink Teflon
to prevent wear and promote easy running of the rod where it
passes thru the guide(s).

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01-20-2003 12:50 AM  15 years agoPost 7
irq

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San Diego, CA

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I have the same concern that DMShanks has, about my Freya.

Would it be bad to have no guides at all, with a carbon pushrod?

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01-20-2003 01:07 AM  15 years agoPost 8
Gbouten

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Alamogordo, New Mexico

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Are you using a boom mounted TR servo? I understand you correct it sounds like you are talking about the push rod going from theTR servo to the tail. I never use guides for my TR push rods and there is no slop.

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01-20-2003 02:57 AM  15 years agoPost 9
DMShanks

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Salt Lake City, UT

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Thanks for the input. I'll go with the "no guide" scenario and see how I fare. If I get a "tuning fork", I'll rig some sort of guide. Have a great week! Dave

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01-20-2003 09:12 AM  15 years agoPost 10
davej

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Tiptree Essex England

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Long Pushrods
I was worried about using a very long (34") c/f pushrod on my Millenium, ATS supplied me with a 6mm solid rod and metal ends, no problems whatsoever but a tip from a good friend, thanks Denis, was to super glue a small piece of dense foam rubber to the boom at mid point sized to just clear the rod this acts as a bounce damper and doesnt wear the rod at all.

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