The earlier 151s have frise ailerons as opposed to the cheaper piano
hinges on the later ones. Give much smoother handling. with the piano
hinged ailerons the aileron it self has ridges to try and retain the
airflow over the ailerons.

No offense, and maybe I'm just an insensitive clod at the controls, but I've
got over 800 hours in Cherokees of all flavors, my '75 had the Frise
ailerons -- and to say that the piano hinge versions provide "much smoother
handling" just ain't true.

In fact, the handling differences are so slight as to be inconsequential.
(Which, of course, is why Piper switched back to the easier-to-build piano
hinged versions...) If I were blindfolded and told to fly either version,
there is no way I would be able to tell you which is which in flight. (On
the ground they DO feel different, IMO -- but who cares on the ground?)
--
Jay Honeck
Iowa City, IA
Pathfinder N56993
www.AlexisParkInn.com
"Your Aviation Destination"