[38] Some P-forty seven pilots claimed to have broken the seem barrier in steep dives, but afterwards research exposed that as a result of force buildup In the pitot tube at significant speeds, airspeed readings grew to become unpredictably exaggerated. As P-47s have been capable of out-dive enemy fighter planes http://www.drugoffice.gov.hk/gb/unigb/kowear.com/american-fighter/