Well, I got to witness one shortfall...or in this cas long fall...

A member at one of my clubs was flying a mach II this weekend with an OS 46 FX on it. He initiated a high speed snap roll. Just as several of us made comments like "we don't need wings on our airplanes", he initiated another high speed snap...and you guessed it, the wing snapped in two. Half of it fluttered down on its own, while the rest stayed attached to the fuse in the lawn dart impersantion which followed.

Examination of the parts afterwards revealed that the joiner passes through the root rib into a short pocket which ends at the end of the joiner. Essentially, the joiner/spar does not even make it to the next rib which is about half a bay away, and the only spar is the joiner. The failure was in the wood that the joiner mounts into, as the joiner was not broken.

To be fair, he had done a number of snaps since owning this plane, but I don't know if the rest were high speed like these two.

Still, a fun plane for the bucks though