Hi Silas...
This video is pretty amazing!
Video of very nice, and very skillfully controlled, B-29 and X-1 models. The B-29 is powered by 4 chainsaw engines. But it would seem to be unprototypically over-powered - how many B-29's could do Immlemann's and outside loops?
formatting link
Be sure to watch the whole thing - it actually drops an X-1 jet fighter whose engine starts in midair...plus both pilots parachute out...
Pretty darn impressive!