jander14indoor wrote:If you want larger pitch changes on Ikara props, careful, very localized application of heat can avoid the stress damage others have mentioned. Also very permanent. If you do it in a jig, easy to control accuracy.
You risk melting, but you'll now that right away.
At one point there was a video, but I wasn't able to find it with a short search. Been a lot of years since I last saw it.
We used to do it the way that Jeff mentions, by heating the spar. I have the video he mentions; pm me with your email address and I'll send you a copy.
Recently we have been making a hub from a 2 cm piece of 5/32" polystyrene tubing (Evergreen #225). Round off the ends of the spars a bit and you get a snug fit that can be easily repitched, then held in place with a bit of Ambroid or Duco cement.