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Old Nov 06, 2012, 05:44 AM
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Carbon Fiber Pushrod Mounting????

Need some advise from the pro's. I purchased these sweet Carbon Fiber in telflon tube pushrods from Kenneny. What is the best connector to mount on the ends for Servo hookup and control horn. Also how does one attached the said connector to the rod? Epoxy, JB weld?

They are going into a 3.5m sailplane.

thanks
Steve in Maine
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Old Nov 07, 2012, 05:46 AM
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Guess it would help to insert a Pic!!
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Old Nov 08, 2012, 12:04 AM
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RWCLOUD's Avatar
Fresno CA
Joined Jul 2006
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I use Du Bro threaded couplers. Lightly sand the carbon rod,wearing a dust mask, with 220 sandpaper. Sand the outside of the non threaded part of the coupler. Test fit the coupler on the push rod. with a small piece of masking tape mark the distance the coupler slides on the push rod. I use medium CA, but you can use JB Weld also. If using CA make sure you push the coupler on in one smooth action, you only get one chance! Then run another bead of CA 1 inch long ( 1/2 inch on coupler then 1/2 inch on carbon push rod. slip a piece of 3M heat shrink tubing over and shrink with heat gun. Slip a heat shield under the push rod if doing this in place so as not to heat up something that you didn't want to.

Maybe this picture will help, if not I'll try to get a better one tomorrow with my camera instead of phone

Blue Skies.....................Tim
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Old Nov 08, 2012, 05:56 AM
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tim,
Thanks for the reply. I'll check my hobby shop for dubro threaded couplers
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Old Nov 08, 2012, 09:18 AM
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You can also crimp the threaded coupler a little with wire cutters. So between that (mechanical) and some CA, they stay on.
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Old Nov 08, 2012, 09:54 PM
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Australia, WA, Perth
Joined Oct 2003
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FYI I did a test years ago on these types of coupler/carbon rod joints. One end was done with CA and the other 5min epoxy. No crimping. The epoxy end failed at around 35kg (75lb) of pull, way overkill.
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Old Nov 09, 2012, 09:30 AM
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After sanding, be sure to clean the rod and connector with alcohol to remove any residue before glueing.
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Old Nov 10, 2012, 09:38 AM
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United States, OK, Moore
Joined Jan 2006
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Quote:
Originally Posted by John Walter View Post
After sanding, be sure to clean the rod and connector with alcohol to remove any residue before glueing.
Ditto to that, and I'd like to add that I take a small dia sewing pin with the sharp point bent over, and run it up and down and all around inside the coupler. This roughens the inside surface to help the adhesive get a better grip.

Edit.... obviously this is for slide-on couplers like would be soldered to metal pushrods. I never tried threaded ones, I thought they would weaken the CF rod....
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Old Nov 11, 2012, 10:30 AM
Mark LSF # 3792
United States, TX, Garland
Joined Nov 2008
671 Posts
Take a close look at the "rod". Are they actually tubes? Mine are on my Supra Pro. If so I recommend you CA a small length of .030 piano wire inside of the "rod" at the coupler junction. This will prevent crushing of the carbon if you decide to crimp the coupler as Mike suggests.
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