The P-38 Swordfish
One prototype P-38 was modified for dive testing. An older P-38 E was the aircraft used for this experimentation. The forward gondola section was moved forward by thirty inches, and the cockpit was move forward by thirty-six inches. The cockpit flight controls were the same, but there was room behind the pilot for a co-pilot/observer/test engineer. This modified P-38 E Swordfish first too flight on June 2, 1943 and was immediately put into extensive dive tests. The tests would have limited results, but this design led into another use for this type of P-38.