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okay I know all (forward and backwards alike) swept wings are useless on propeller aircraft but I can't help it because I'm addicted to reducing parasitic drag so here's a double cylindrical wing. the propellers are inside the loop as are the control surfaces that also hold up the engine (does this count as wing-mounted empennage? or maybe it can be an X tail who knows)
anyways, this is a joke. I just had the idea for the weird inverted aircraft fuselage and needed a justification for it.