I used the Sam-Rai wingtip as the pattern.

Trace the pattern onto contest grade (very lightweight) balsa.

They were cut out using the jig saw and were glued on using Gorilla glue.
Wet the surface with water prior to applying the glue.

Tape the wing tips in place.

I applied a little too much glue and it foamed outside the joint.

It is easier to remove the extra before it dries