There are, however, several claims that the sound barrier was - TopicsExpress

There are, however, several claims that the sound barrier was broken during World War II by manned aircraft. In 1942, Republic Aviation issued a press release stating that Lts. Harold E. Comstock and Roger Dyar had exceeded the speed of sound during test dives in the P-47 Thunderbolt. Hans Guido Mutke claimed to have broken the sound barrier on 9 April 1945 in an early German jet aircraft, the Messerschmitt Me 262. Mutke reported not just transonic buffeting but the resumption of normal control once a certain speed was exceeded, then a resumption of severe buffeting once the Me 262 slowed again. He also reported engine flame out... The Luftwaffe test pilot Lothar Sieber (April 7, 1922 - March 1, 1945) may have inadvertently became the first man to break the sound barrier on 1 March 1945. This occurred while he was piloting a Bachem Ba 349 Natter for the first manned vertical takeoff of a rocket in history. In 55 seconds, he traveled a total of 14 km (8.7 miles). Unfortunately, there was a crash and he perished violently in this endeavor. Very little of his remains were found in the 15 ft deep crater, but he did receive a funeral with full military honors.

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