This kit has two optional features.
- Plywood F3 for use with a nylon engine mount
- Ribs cut for use with 3/32 leading and trailing edge sheeting and cap strips
Choose the alternate version or the standard version for each item. On the alternate wing, the leading edge is 1/2″ balsa. In either case, the spars are 1/2″ wide rather than the unusual 9/16 called for on the plan.
My laser cutter doesn’t like 3/8″ balsa, so you cut out the tail yourself. Or better yet, build it from sticks. Wing saddles are notched for a 1″ x 3/8″ bolt block.