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I'm liking the looks of this P-40Q right now.
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That's a neat looking four-engine aircraft right there, it resembles in a way the beautiful B-29 Superfortress as well.
Can't see how the Rainbow resembles a B-29 in any way, nor would I ever say that the B-29 is a beautiful aircraft. Not many 4 engine aircraft could be called that, IMO, but the Rainbow is one.
Honorable mention to the Beechcraft A-38 Grizzly.