On Sep 14, 6:46*pm, 150flivver wrote:
Has anyone seen a 150hp Pawnee (PA-25) get upgraded with a bigger
engine? *Our soaring club has the opportunity of acquiring a 150hp
Pawnee (donated by a member) but we would only do so if it were
possible to upgrade the engine so it could be used as a towplane. *I
did a cursory search on the FAA website and could find no STCs to
install a larger engine. *With only 150hp, the Pawnee apparently is a
very anemic towplane.

There is a PA-25-180 in South Carolina that was owned bt Jeff Cloud.
Not sure who got it after he died. There was one at the Houston club
in Waller TX when I visited there last year.
Our club in SE new York uses the same combination. We think it works
well for us. The question will be whether you can get anyone these
days to sign off on a field approval which is how these ships were
converted.
If you are serious, I have copies of the associated 337's for Jeff's
airplane and ours.
Good Luck
UH