B-29 Superfortress is the correct answer.
The Vought Corsairs only had a prop of 13 feet (dia.)(P-47 used the same prop I believe) while the B-29 was 16 ft, 5 in. (dia.).
The F2G Corsair had the biggest Engine with 3,000hp as the B-29 only had 4x 2,200 hp models. No F2G saw no combat but spent most of their time as racing planes.
The F5U Flapjack had some good ones but I was refering to combat planes not test planes - my bad - I will be more specific next time.
The Kolbrai is an autogyro not an aircraft. You are thinking of rotors like a helicopter. Totally different varment.

Good thinking though.

B-36 was WAY post-war, remember we are talking WW2 in all these questions. The first XB-36 did not fly till Aug. 8, 1946.