Lars Reinhold: Messerschmitt Me 163: Komet ohne Strahlkraft. 4. Mai 2023, abgerufen am 20. Februar 2024: „Als Heini Dittmar am 2. Oktober 1941 ins Cockpit der Messerschmitt Me 163 A V-4 stieg, hatte er ein klares Ziel vor Augen: 1.000 km/h. Eine bis dato noch nie von einem Menschen erreichte Geschwindigkeit wollte Dittmar knacken, und er hatte dafür das vermutlich beste Flugzeug zur Verfügung. […] In der anschließenden Flugphase beschleunigte das ‚Kraftei‘ auf 1.003,67 km/h bzw. Mach 0.84. Die magische Grenze von 1000 Stundenkilometern war gefallen, die Schallmauer jedoch nicht durchbrochen.“
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Alexander Lippisch: Germany and the Delta Wing. In: Aero Digest. Band63, 1951, S.68 (eingeschränkte Vorschau in der Google-Buchsuche): „This experimental high-speed sweptback type was designated as Me 163A and was test flown in 1941. On the second of October, 1941, Dittmar flew for the first time more than 1000 km/h in 3600 m. altitude, or 540 knots at 12,000 feet, corresponding to a Mach Number of 0.85.“
Peter O. K. Krehl: History of Shock Waves, Explosions and Impact – A Chronological and Biographical Reference. Springer, Berlin, Heidelberg 2009, ISBN 978-3-540-30421-0, S.524–525 (eingeschränkte Vorschau in der Google-Buchsuche [abgerufen am 21. Februar 2024]): „According to a more recently published interview, Hans G. Mutke, a former German World War II test pilot of the Messerschmitt Me 262, reported in 2001 that during a test flight near Innsbruck (on April 9, 1945) his plane went into a steep dive of 40° at an altitude of 11,000 m, thereby passing the sound barrier for a duration of about seven seconds (his airspeed indicator was stuck against its limit of 1,100 km/h).“
Al Blackburn: Aces Wild – The Race for Mach 1. Rowman & Littlefield, Wilmington, Delaware 1999, ISBN 978-0-8420-2732-8, S.275 (eingeschränkte Vorschau in der Google-Buchsuche [abgerufen am 20. Februar 2024]): „One of Geoffrey's successors at de Havilland, the quietly talented John Derry, who favored the hydraulic-powered pitch control, nursed the Swallow through an out-of-control dive from 45,000 feet that nonetheless took him supersonic. It is doubtful he would have survived the wild gyrations without the boosted control system. That was on September 6, 1948, nearly a year after the Americans had laid down their marker in a much more repeatable and far less ostentatious manner. Still, the Swallow was the first British design to fly supersonic.“
Kenneth P. Werrell: Sabres Over MiG Alley – The F-86 and the Battle for Air Superiority in Korea. Naval Institute Press, Annapolis, Maryland 2005, ISBN 978-1-61251-344-7, S.11 (eingeschränkte Vorschau in der Google-Buchsuche): „The USAF acknowledges that the F-86 broke the sound barrier, albeit in a dive, in April 1948. (The Air Force made this disclosure after an excited British pilot, Roland Beaumont, gave details over an open microphone that appeared in the June 1948 Aviation Week.) […] Some go further, claiming Welch was the first to go supersonic. Horkey implies Welch may have done so, since he was flying the same flight patterns prior to 14 October as he did when NACA registered his supersonic dive.“
Peter Caygill: Sound Barrier – The Rocky Road to MACH 1.0+. Pen & Sword, Barnsley, South Yorkshire 2006, ISBN 978-1-84415-456-2, S.157 (eingeschränkte Vorschau in der Google-Buchsuche): „Any hope of exceeding Mach 1.0 was delayed until the arrival of the J40 with the result that this feat was only achieved in August 1953 at Edwards AFB.“
United States. National Aeronautics and Space Administration (Hrsg.): X-15 – Research at the Edge of Space (= NASA EP. Band9). Washington, D.C., S.6 (eingeschränkte Vorschau in der Google-Buchsuche): „Finally, in November 1953, the ‚Skyrocket‘ became the first airplane to fly at more than twice the speed of sound or Mach 2.005, when Scott Crossfield, flying as a research pilot for the National Advisory Committee for Aeronautics, attained a speed of 1,291 m.p.h.“
Secretary of the Air Force (Hrsg.): Aerospace Information Handbook – Releasable Data on USAF Aerospace Vehicles. Band3, Nr.190. United States. Department of the Air Force, Washington, D.C. Juni 1964, F-100 Supersabre, S.43 (eingeschränkte Vorschau in der Google-Buchsuche): „The F-100D Supersabre, originally a day-fighter, has become the workhorse of tactical air units. […] It was the first U.S. Air Force aircraft to fly at supersonic speed in level flight. […] The Supersabre once held a world's speed record of 822 m.p.h. set in August 1955 during a flight over the California desert.“
Albert C. Piccirillo: The Me 163B Komet, Development and Operational Experience. In: SAE Transactions/Journal of Aerospace. Band106, 1997, S.1839, JSTOR:44650570: „Testing with the modified aircraft began in the summer of 1942 and on one of these tests, Rudolph Opitz reached a true airspeed of 702 mph (1,130 kph) before exceeding the critical Mach number. Opitz was barely able to recover from the subsequent loss of control. He made a successful landing despite the disintegration of nearly the entire rudder caused by the aircraft exceeding its limiting flutter speed.“
luftfahrt24.de
Friedrich List: Deutsche Flieger klopfen an die Schallmauer: Heini Dittmars Rekordflüge mit 1000 km/h. In: luftfahrt24. 18. Dezember 2017, abgerufen am 20. Februar 2024 (deutsch): „Bei einem zweiten Rekordflug im Juli 1944 kam er sogar noch näher an Mach 1 heran. Er erreichte 1130 km/h, kam also in unmittelbare Nähe der einfachen Schallgeschwindigkeit von 1200 km/h.“
