A few comments that I have read about the Stinger 120 wing being subject to failing in flight have interested me since I have started building mine and don't want to re-kit it during flight.

Some issues that I would appreciate comments on:

1. No one has indicated just where on the wing the failure(s) ocurred. Was it at the centerline?
Was it at the area where the plywood spar doubler ends? To the best of my knowledge,
These are the only areas that could fail due to an over-stress situation.
2. Assuming that the foregoing is correct, it would seem that if the failure was at the centerline,
strengthening the area with fiberglass should solve this condition. If the failure was at the
end of the plywood spar doubler, then adding a series of lightening holes with the largest
at the outer ends of the spar doubler and progressively making the adjacent holes smaller
would reduce the stress riser and allow the wing loads to transistion from the outer wing to
fuselage structure.
3. Rather then replace the balsa spars with hardwood and add weight, would running carbon
tape on top of the spar area be a lighter and much stronger way of strengthening the wing?

4. In addition to reinforcing the wing saddle area with plywood doublers, would running carbon
tape fore and aft along the bottom and sides of the fuselage be a good idea?

Thanks

Dave Kovensky
[email protected]