We build our own wing joiners, from carbon rovings. The main wing joiner was built last year (I did a whole bunch in series over a couple of months). As we will have exchangeable outer wing sections we also needed smaller wing joiners for that part of the wing. The 15m (4.28m) version will have one with a 5 degree angle, the 18m (5.14m) version with a 2 degree angle. The moulds for the wing joiners were made by hand, and are precise enough for our purposes.

We form a kevlar sleeve around the main wing joiner. This sleeve will be built into the main wing.