Messerschmitt Me 163 Komet

The Me 163 began not with Messerschmitt but with the tailless gliders of Alexander Lippisch. His work at the German Research Institute for Sailplane Flight produced the rocket-powered DFS 194, whose trials convinced the Air Ministry that a compact interceptor could climb to an incoming bomber stream, attack and return as a glider. When Lippisch’s team moved to Messerschmitt, the project inherited the Me 163 designation and retained the swept, tailless planform that made the little aircraft instantly recognisable.

The concept was point defence in its purest form. A Komet base would sit near a target the bombers had to cross; warning from the ground would launch the aircraft into a near-vertical climb, and speed rather than endurance would carry it through the formation. That logic produced an aeroplane only 5.70 m long, but it also built a trap into the design: once the bomber stream passed outside the small defended circle, the Me 163 could not follow it. The interceptor was tied as firmly to its base as an anti-aircraft battery.

Powered trials of the Me 163A began at Peenemünde in 1941. On 2 October, test pilot Heini Dittmar reached 1,004.5 km/h in a prototype released from tow at altitude — the first time an aircraft had passed 1,000 km/h. The achievement remained secret, and it exposed compressibility effects that contemporary instruments and controls were only beginning to explain. The Komet had entered a speed regime several years ahead of the fighters it was intended to meet.

Speed alone did not make an operational weapon. The Me 163A was a development aircraft with little room for fuel or armament, and the combat-capable Me 163B was substantially redesigned around a more powerful Walter motor. Its first prototype was completed in April 1942, yet reliable engines did not arrive until later that year and powered testing of the B-series stretched into 1943. The gap between the record flight and combat service was almost three years — a measure of how much engineering remained after the headline number had been achieved.

The production Komet’s Walter HWK 109-509A-2 rocket produced about 16.7 kN of thrust by bringing two liquids together in its combustion chamber. T-Stoff was approximately 80 per cent concentrated hydrogen peroxide; C-Stoff contained hydrazine hydrate, methanol and water. They were hypergolic — contact started the reaction without an ignition system — and each required its own tanks, pipes, pumps, vehicles and handling crews. A leak, contamination or the wrong connection could start a fire or detonation without warning.

Pilots and ground personnel wore protective clothing, but the danger could not be engineered away. A hard landing might rupture a line or tank, leaving an injured pilot surrounded by residual propellant; refuelling had to be performed in separate stages with the aircraft washed between them. The hazards were not a colourful footnote to the Komet’s story. They killed men, slowed operations and made every sortie a chemical-handling exercise before it became a combat mission. The weapon’s extraordinary performance came from carrying an industrial accident inside a plywood-and-metal airframe.

At take-off the Me 163 rested on a detachable two-wheel dolly. Once airborne the pilot jettisoned it and climbed at up to ~4,900 m/min — about 16,000 ft/min — toward a ceiling near 12,000 m. Maximum speed was approximately 959 km/h, beyond any Allied fighter then in ordinary squadron service. But the motor could run at full power for only about 7.5 minutes. Even throttled, it offered minutes rather than the hours expected of a conventional fighter.

After the fuel was exhausted, the Komet became a fast glider. It returned without power, lowered a sprung skid and landed once: there was no engine reserve for a go-around. The discarded dolly could bounce back into the aircraft during take-off, while a skid that failed to extend or absorb the impact could injure the pilot’s spine. On soft ground the Komet might overturn; if fuel remained, the result could be fire or explosion. The same minimalist landing system that saved weight also made routine recovery one of the flight’s most dangerous phases.

The Me 163B carried two 30 mm MK 108 cannon, weapons powerful enough to destroy a heavy bomber with a few hits. Delivering those hits was the problem. The Komet approached a formation so quickly that the pilot had only seconds to identify a target, judge the lead and fire before overshooting. The MK 108’s relatively low muzzle velocity compounded the geometry: a projectile and a bomber moving through different planes of motion left little margin for error at the Komet’s closing speed.

Experimental answers included an Me 163A photographed with 24 R4M rockets, twelve beneath each wing, but that installation did not enter operational service. Another trial weapon, the upward-firing SG 500 Jagdfaust, was intended to fire automatically as the Komet passed beneath a bomber. Such schemes addressed the real contradiction at the heart of the aircraft: the rocket motor made interception possible, yet its speed made accurate interception fire extremely difficult. The standard two-cannon Komet remained dependent on a pilot mastering an attack that lasted moments.

The sole operational unit was Jagdgeschwader 400. Production Me 163Bs became ready in July 1944, and the unit was positioned to defend the synthetic-fuel complex at Leuna near Leipzig. Its first engagement with Eighth Air Force B-17s came on 16 August 1944. The Komet could climb through escorting fighters and force bomber crews to react to an aircraft they could scarcely track, but small numbers, fuel shortages, serviceability problems and the narrow radius around its bases prevented sustained pressure on the bomber offensive.

Official museum histories credit JG 400 with nine Allied aircraft destroyed while losing 14 Me 163s. Those figures are the necessary antidote to the aircraft’s reputation. The RAF Museum records approximately 364 Me 163s built in all, including 279 production machines; the US Air Force museum likewise gives 279 Me 163Bs delivered. Yet production did not translate into sorties. By April 1945 II./JG 400 had about 80 aircraft at Husum, most grounded for lack of fuel, and flew once more only after a single rail delivery of propellant.

The Komet was neither a fraud nor a war-winning weapon delayed by bad luck. It genuinely combined a controllable tailless airframe, a throttleable liquid-fuel rocket and a climb rate no piston fighter could approach. It was also the only rocket-powered interceptor ever used in combat. Allied engineers studied captured examples closely, and test pilots found that beneath the propulsion hazards lay an aerodynamically capable glider. The achievement belongs to the designers and pilots who made an unprecedented machine fly, not to the propaganda category of a miracle weapon.

As a combat system, however, the Me 163 exchanged nearly everything a fighter needs for one burst of performance. Its ~80 km combat radius covered only a point on the map; its powered endurance was measured in minutes; its landing was unpowered; its fuels endangered everyone around it; and its attack window was almost too short to use its cannon. Nine victories could not justify the industrial effort or the losses. The Komet reached the bomber stream faster than any other fighter — and then, almost immediately, had to become a glider and come home.

• Stephen Ransom & Hans-Hermann Cammann, Me 163: Rocket Interceptor (Crécy Publishing, revised combined edition, 2022).
• Mano Ziegler, Rocket Fighter: The Story of the Messerschmitt Me 163 (Arms & Armour Press, 1976) — account by a pilot of Erprobungskommando 16.
• Wolfgang Späte, Top Secret Bird: Luftwaffe’s Me-163 Komet (Pictorial Histories, 1989) — account by the commander associated with Erprobungskommando 16 and JG 400.
• Eric Brown, Wings on My Sleeve (Weidenfeld & Nicolson) — test-pilot memoir including the captured Me 163.
• William Green, Warplanes of the Third Reich (Macdonald & Jane’s).