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-   -   carbon rods (http://www.Wattflyer.com/forums/showthread.php?t=72836)

egrave1 12-20-2013 06:41 PM

carbon rods
I need to install carbon rods on my foam ailerons how should I install it glue it on the surface or cut a grove in the ailerons to glue the rods in

Rockin Robbins 12-20-2013 07:34 PM

I'd cut a groove. An aileron needs to be aerodynamically clean as much as possible.

egrave1 12-20-2013 08:01 PM

thank you I will cut the grove

fhhuber 12-20-2013 08:12 PM

Cut a groove....
paint (very thin coat) the inside of the groove with gorilla glue "Dries White" quick set polyurethane glue.
insert the rod.
Tape cover with clear packing tape (peeling the tape will remove paint)
Weight the aileron onto a flat surface supporting the rest of the wing as needed.
Let set for a couple of hours
Peel the tape if desired.

You'll have a very rigid and flat aileron.

If you skip weighting it to a flat surface while the glue sets (regardless of type glue) you can end up with a warped control surface which means the airplane will change trim with airspeed.

Rockin Robbins 12-21-2013 03:12 PM

And watch out. My experiences with Gorilla Glue White fixing a Slow Stick wing have been VERY discouraging. The stuff HATES sunlight, becoming a quite yellow, brittle, friable rotten waste of effort in a very short time. I've rethought my whole repair process as a result.

The best repair method for a Slow Stick wing has been careful use of hot glue. That's not ideal because of hot glue's weight, but the repair has to work first and be light second. So I'm not happy with any method I've found really.

I'd be tempted to go with a very sparing use of epoxy for the ailerons. I would avoid CA except for use as clamps to hold everything in position until your other glue cures. CA is just too brittle.

It's possible that the newly cured Gorilla Glue White has some resiliency (must be proven by testing. There's good chance it is useless from the start with no flexibility and no cohesiveness). If it is initially good, it could be protected by low temp, UV screening Doculam (3 mil) ironed on the control surface over the repair. Doculam is MUCH cheaper than Monocote, sticks better, the matte version can be painted--it's just a miracle substance for building planes and I never would have figured it out without building my Crashtesthobby.com Grim Reaper and C4H10's posts about using the stuff.

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