Hans Guido Mutke

Hans Guido Mutke
Born	(1921-03-25) March 25, 1921 Neisse, Upper Silesia (now Nysa, Poland)
Died	April 8, 2004(2004-04-08) (aged 83) Munich, Germany
Occupation(s)	Fighter pilot, commercial aviator, medical student
Known for	Claims of supersonic flight in a Messerschmitt Me 262 during World War II

File:Messerschmitt Me 262.jpg

The Me 262A-1a 500 071 flown by Hans Guido Mutke, exhibited at the Deutsches Museum

Hans Guido Mutke (born 25 March 1921 – died 8 April 2004) served as a fighter pilot in the German Luftwaffe during World War II. His birthplace was Neisse in Upper Silesia (now known as Nysa, Poland).

On 25 April 1945, Mutke landed his Me 262A-1a jet fighter, designated 'White 3' from the 9th Staffel of Jagdgeschwader 7, at Dübendorf, Switzerland. Although he stated that this was due to becoming disoriented during a mission, there were doubts about whether he had defected. The Swiss authorities refrained from flying the aircraft and kept it in storage before eventually returning it to Germany on 30 August 1957. After the war, Mutke unsuccessfully pursued legal action against the German government to reclaim the aircraft, asserting personal ownership.Template:Fix/category

Mutke also asserted that he surpassed the sound barrier in 1945 while piloting a Messerschmitt Me 262, a claim that remains contentious as mainstream consensus credits Chuck Yeager with the first official supersonic flight in 1947 aboard a Bell X-1.

The dive

On 9 April 1945, Fähnrich Mutke, assigned to the third flight of the Ergänzungs-Jagdgeschwader 2 (EJG 2) conversion squadron, departed from Lagerlechfeld in his Messerschmitt Me 262 bearing the markings Weiße 9 for a scheduled high-altitude sortie. While climbing through an altitude of approximately 12,000 m (36,000 ft) under nearly ideal weather conditions with visibility exceeding 100 kilometres (62 mi), and monitoring radio communications, his chief instructor, Oberstleutnant Heinz Bär, identified an incoming threat—a P-51 Mustang closing in on Unteroffizier Achammer’s aircraft from behind.Template:Fix/category

In response, Mutke initiated a steep dive at a 40° angle with full throttle applied. As he passed through the altitude of 12,000 metres (39,000 ft), his Me 262 began experiencing severe vibrations and lateral oscillations. The airspeed indicator pegged beyond its maximum reading of 1,100 km/h (684 mph), despite the Me 262’s official top speed being around 870 kilometres per hour (540 mph). At this altitude, the speed of sound is approximately 1,062 km/h (660 mph), subject to atmospheric conditions. The shaking intensified to the point where control was momentarily lost. With the airspeed gauge still maxed out, Mutke attempted recovery by adjusting the main tailplane’s incidence angle—a feature unique to the Me 262 which allowed alteration of the entire tailplane angle rather than just using hinged elevators; this mechanism was later incorporated into the Bell X-1 design. This adjustment briefly halted the buffeting and restored control for several seconds. However, upon throttling back, both engines flamed out and after a short smooth interval, buffeting resumed accompanied by violent shaking. Through considerable effort, Mutke regained control and restarted the engines, eventually reducing speed below 500 kilometres per hour (310 mph). Upon landing, inspection revealed numerous missing rivets and deformed wing surfaces on his aircraft.Template:Fix/category

Claims

Initially, Mutke was unaware of the causes behind this unusual aircraft behavior. It was only after becoming informed about Chuck Yeager's supersonic flights in 1947 that he attributed these occurrences to supersonic effects and asserted that he had surpassed the sound barrier years prior to Yeager. This assertion remains controversial, with multiple pilots and nations claiming the first supersonic flight. Nevertheless, Mutke never declared himself as the pioneer in breaking the sound barrier; rather, he maintained that his flight demonstrated the Me 262’s capability to reach and exceed Mach 1, implying that other German pilots might have achieved this milestone before him.

During World War II, Messerschmitt conducted a series of rigorously controlled flight experiments which revealed that the Me 262 became uncontrollable in a dive at Mach 0.86. Attempts to exceed this speed resulted in a nose-down trim that pilots could not counteract using the control column. This led to an increasingly steep dive, accelerating to velocities that could cause structural failure due to extreme negative G forces. Postwar evaluations by British authorities confirmed Messerschmitt’s findings, although neither party recorded speeds beyond Mach 0.86.

Mutke claimed he managed to counteract the increasing dive angle by adjusting the tailplane incidence of the 262—a method later employed by Chuck Yeager in the Bell X-1 to prevent Mach tuck. Additionally, Mutke’s report of momentarily regaining control while still accelerating aligns with documented experiences of supersonic flight.

Following the war, American test pilots submitted reports on the Me 262, including its potential to reach Mach 1. However, compressibility effects in contemporary pitot tubes often caused inflated speed readings near the sound barrier, especially with German instruments that suffered from wartime supply shortages. Similarly, American aircraft such as the F-86 Sabrejet, along with other high-speed planes like the Bell X-1, encountered irregular airspeed measurements in transonic conditions (between Mach 0.8 and Mach 1). The Me 262’s fuselage design—lacking area rule optimization—would have produced significant transonic drag, compounded by its already underpowered and temperamental engines. Despite this, aircraft like the Bell X-1, F-86 Sabre, and Convair F2Y Sea Dart also lacked area-ruled fuselages yet are recognized for achieving supersonic flight—demonstrating that engine thrust combined with gravitational acceleration during dives can propel an aircraft beyond Mach 1.

Because Mutke’s flight occurred during combat conditions, accurately determining his plane’s speed is not feasible; likewise, calculating the speed of sound for that specific altitude and temperature is challenging. Consequently, his claims cannot be definitively confirmed or refuted, leading to ongoing debate among experts regarding whether the Me 262 truly reached sonic speeds. It is generally accepted that the severe vibrations Mutke experienced were caused by buffeting—shock waves and turbulent airflow over parts of the airframe—which typically occur near Mach 1 but diminish once supersonic velocity is surpassed. Other Me 262 pilots also reported similar incidents involving structural failure or midair breakups attributed to buffeting and altered aerodynamics at transonic speeds. Comparable transonic buffeting phenomena were widely documented by pilots flying propeller-driven Allied fighters such as the Supermarine Spitfire, P-38 Lightning, P-47 Thunderbolt, and P-51 Mustang. These aircraft had maximum diving speeds below Mach 0.85 (though one Spitfire was recorded at Mach 0.92), yet pilots observed supersonic shock waves and rivet failures during dives when localized airflow over wings exceeded Mach 1 despite overall aircraft speed remaining subsonic.

Supporters of Mutke’s claim often suggest that postwar Allied powers showed little interest in highlighting German technological accomplishments during WWII. Nonetheless, Mutke’s assertion lacks validation through controlled experimental evidence.

A computer simulation assessing Me 262 performance conducted in 1999 by the Technische Universität München determined that it was indeed possible for the Me 262 to surpass Mach 1.

After World War II

Following the conclusion of the war, Mutke relocated to Argentina, where he piloted Douglas DC-3 aircraft for multiple airlines. Subsequently, he made his way back to Germany and pursued medical studies. He passed away in Munich in 2004 during surgery involving a heart valve. His body was donated to the anatomist Gunther von Hagens.

References

• aerospaceweb.org Me 262 & the Sound Barrier, aerospaceweb.org
• Flypast magazine (page 31)- November 2011

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