RE: Which is lighter CA or Titebond?
strength to weight the wood glue is way better. i use all wood glue for everything. I use CA for quick repairs. The only time i use epoxy is when fiberglassing and that isnt really required either as i have used fiberglass soaked in wood glue on wing joints and firewalls very effectivly (sp).
I use wood glue for wing joining when its wood to wood. carbon spars i will use a 24 hour cure epoxy. the 5-30 minute stuff to me isnt any better than wood glue.
I feel the wood glue is lighter than CA as people over use the CA.
The real thing is CA or wood glue doesnt matter to much as a lighter servo or engine will far make up the difference in glue weight. I wouldnt worry either way on the weight of which glue you use unless you build with epoxy. one other thing if you mix up to much epoxy and have left over DO NOT PUT ON THE PLANE this just adds weight and no strength.