Checked item #14 off the "to do this life" list Monday. "Visit USAF museum at Wright-Patterson AFB, Dayton OH." We arrived around noon local (having had lunch) and they kicked us out at 5pm. We barely covered it. Here's a couple pics (click on pics for zoomation).
Piper PA-48 Enforcer ground attack prototype. The sign notes it's a 1980's take on the P-51 with gas turbine power.
BockScar - The B-29 that dropped the second atomic bomb on Nagasaki.
P-82 Twin Mustang
Allison V-3420 engine. 24 cylinders, 3420 CID, 3000HP. It's effectively a pair of Allison V-1710's in a single engine block. Each side has it's own crankshaft. The power is merged through a gearbox at the prop hub.