I, too, built and flew a "Flying Fool" back in the late 50's,
powered by a McCoy .29. I made wheel pants for it and fairings
for the struts. First flight the top wing blew off, and she really
got *fast*!

Fast-forward to the 80's, adn I bought a "Fool" kit with the
intention of building another one (and do it right this time!)
The kit was such a *disaster* (wood quality and die-cutting) that
I sent it back to Sterling with a letter of complaint. I couldn't
even use the rib sheets as patterns, they were so bad.
That's when I met the late Joe Perovitch, who at the time was the
"guy in charge" at Sterling in Philadelphia, PA.
(He was a great stunt flyer at the time).
He described a Flying Fool that he'd built, using ribs from the top
wing to build the bottom wing at the same *chord* as the top wing.
Powered by K&B Tornado "green head" .35, he said it would do the
pattern with no shame.
So he sent me all the necessary bits to do the same, and personally
selected all the wood in the kit. Naturally, I never built it, and
sold the kit when I moved to Arizona last year.
I *did* have the pleasure of meeting his son (Joe also) and flying
with him at our Philly Fliers field at Neshaminy State Park. He's an accomplished stunter in his own right, but has been doing other things.
DAT
I hope he gets back to it.