Here is a 1/5th scale B-29 with four 160cc engines and a weight of over 450 pounds. The wingspan is 30 feet:
Amazingly, there is another model of the B-29 that looks to be nearly as big, plus it carries a separate X-1 model under one wing that flies on its own (jump to the 2-minute point):
It can eject its pilots and flies upside down. But the wingspan is only 20 feet on this plane. Here’s a detailed description:






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