That style of RC biplane is actually happy to have the extra drag of the extra wing. Pattern flying judges judge on constant speed of the aircraft. They don’t want to perceive the plane speeding up or slowing down. Those planes have double the power to weight so up lines there is plenty of power to accelerate upward. Downwards the drag keeps the plane from accelerating due to gravity. Fuselage is fat because of that too. Very fun to fly. Very stable; not fast. Very agile.
I am not after crazy fast...but sustainable fast.
The E-Racer Model is the first ever example of an electric race plane, built by Team Condor in their Yorkshire-based workshop in the North of England using a highly-modified Cassutt aircraft.