Originally Posted by sledghammer
It seems like they'd have a lot of induced drag; is there a pronounced ground effect?
Ground effect would only happen about 3 feet from the ground. Unless you are trying to land without pulling your chute there is no ground effect.
Ground effect is an increase of lift and a decrease of drag... Or an increase of lift without an increase of power. This happens about a wingspan away from the ground in a fixed-wing airframe or about 1.5x the blade length of a rotor airframe.