The wing joiner of my Elita broke few months ago. After a lenghty repairing of the ship, its about time to make the joiner.
The joiner is 25mm in width, 15mm height and 160mm long each side. Two degrees of dihedal each side.
The mode is made from alu tubes :
Four pieces of brass bar as spacers and put in place. PVA (mould release agent) already applied on all surface:
Carbon tow (used 60 meters) cut to suitable lenght and wripping the spacers. The mould is ready to close:
Mould closed with excessive force applied in order to squeese out the epoxy. Thereafter, put into vacumum bag. No air bubbles is allowed in the joiner:
The mould was kept in warm box (at 50 C) overnight. After opened the mould, the joiner seems OK. The next thing is to pull out the spacers. The hole at the end is for easily access to a vice / clamp. Final step is to cut into suitable size :
The finishing is good. Looks like a commercial produced. Total weight is 77 grams (well done) as I have used UHM carbon which is quite expensive :
勁，不愧為滑翔機會技術主管！