The Aircore, Sturdy Birdy, and Duraplane are well known to have wings that are just too small, and wingloadings that are just way too high.

There's nothing inherent in coro, PVC, or foam that requires a high wingloading and poor performance. The air neigher knows nor cares what an airplane is made out of. All that matters is the wingloading, get the wingloading down, and anything will float.

It's funny how history repeats itself. Back in the late 20's and early 30's, people were starting to experiemnt with the radical idea of making airplanes out of METAL! *Gasp* IT was too heavy they said, it would never fly they said. And don't even think of only having 1 wing with no bracing wires or struts, it will just never work, it can't be done. Oh, and enclosed cockpits are just too dangerious, the pilot just can't feel the air to know what the plane is doing.

Same story, different scale and differnet era. But good for a laugh for those of us who know better