David Megginson wrote in message ...

Either Piper spin-tested the other models and found them
unsatisfactory, or else the test pilots wouldn't even try spinning
them in the first place (because of engineering predictions). Neither
thought makes me too comfortable.


Piper spin tested the "stretched" models. They had to as part of
the certification testing. That's a whole different ballgame than
approval for intentional spins. Oddly enough, the original stretched
models were not restricted from intentional spins when they 1st came
out. Spin approval was rescinded for those models a few years later
by AD.

John Galban=====N4BQ (PA28-180)