TIO-360C - 210 hp - 379 lbs
TIO-540W1A5 - 235 hp - 400 lbs

The Arrow is heavy enough without adding more weight to the nose.

Interestingly, I found out today that Piper built several O-540
powered Arrow prototypes, back in 1980 -- with 300 horsepower! (It
was supposed to be a trainer for some Banana Republic's air force.)

One is still in the registry -- registered to Piper under the
Experimental category.

Damn, I'll bet that thing moves right along!

Look at how/where the fillets join the wing and fuselage.
While a fillet at the leading edge might pose a problem with removing
the cowl, the trailing edge fillet would interfere with the flap
operation.

I've got the wing fillet mod on Atlas. It poses no problems with
either the cowling or the flaps.
--
Jay Honeck
Iowa City, IA
Pathfinder N56993
www.AlexisParkInn.com
"Your Aviation Destination"