Hip Pocket Builders' Forum

Indoor Free Flight Forum => F1D, F1M, F1L => Topic started by: Rossclements on January 18, 2018, 12:25:34 PM



Title: Carbon wingpost attachment?
Post by: Rossclements on January 18, 2018, 12:25:34 PM
Hello all,

After seeing Joshua Finn's F1D at kibble, I figure I should try carbon wing posts. I hate boron/balsa wing posts, it always seems to pop up. But I'm not too sure how to attach them to the motor stick, it seems that under the torque of a fully wound motor, that they would cut into the balsa? Is this a problem, and if so, what should I do to fix it? For the tissue tube attachment for the wing, I figure I can drill out a piece of 16th to slide over the .028" wing post.

Thanks!
Ross Clements


Title: Re: Carbon wingpost attachment?
Post by: jakepF1D on January 18, 2018, 05:05:35 PM
Mine are simply glued in precisely located holes in my motor tubes.  I use larger carbon tubing, and have no concerns about damaging my motor tubes.  Details of how I make my wing posts are at the link.  I personally wouldn't recommend .028 carbon.  It's much too flexible in my opinion.

http://www.hippocketaeronautics.com/hpa_forum/index.php?topic=20872.0


Title: Re: Carbon wingpost attachment?
Post by: mkirda on January 18, 2018, 05:10:38 PM
I use a jig to hold my rolled fuse in place, then drill out holes using a mill.

Those holes can be hardened with a bit of CA. I typically add about 1/8" squares of tissue glued on with thinned Ambroid though.

For the carbon tubes, a bit of CA on the surface where they will hit the wood, then some Ambroid to really cement them in place.

I haven't had issues with the carbon tubes being too flexible, however my design has fairly short wing posts.

Regards.
Mike Kirda