Originally Posted by
ryan1234
I'll throw this in the mix even though it's not contra-rotating - I've heard the prop was taken from the A-1D with a heavily modified P-51D airframe and an Avco-Lycoming YT-55-L-9 turboprop of 2,445 hp. The Piper PA-48 Enforcer:

The Enforcer actually was almost a completely different airframe. I went down to Eglin AFB when it was doing testing and everyone knew it was a dead-end deal. The USAF was NOT going to go back to props and it was NOT going back to tailwheels even though the Enforcer did show long loiter times, good lifting power for ord.
Joe Baugher weighs in here on the Enforcer.
Piper Enforcer