The Lippisch P.20 was a proposed tailless, ramjet-powered interceptor aircraft design developed by Dr. Alexander Lippisch in Germany during the final stages of World War II, around 1944-1945. It represents a significant concept in the evolution of delta-wing aircraft and advanced propulsion systems.
Overview
The P.20 was a conceptual design aimed at creating a high-speed, high-altitude interceptor to counter Allied bomber formations. Following Lippisch's extensive work on tailless aircraft, including the Messerschmitt Me 163 Komet rocket fighter, the P.20 incorporated many of his signature aerodynamic principles, notably the delta-wing configuration. Its primary distinguishing feature was its reliance on ramjet propulsion for sustained high-speed flight.
Design and Development
Dr. Alexander Lippisch, a pioneer of delta-wing and tailless aircraft, developed the P.20 as a natural progression from his earlier designs. The project was conceived at a time when Germany was desperately seeking revolutionary weapons to turn the tide of the war.
Key design features included:
- Tailless Delta Wing: The aircraft featured a pure delta wing planform with a deeply swept leading edge, characteristic of Lippisch's designs. This configuration offered excellent high-speed performance and structural simplicity.
- Ramjet Propulsion: The main power source was envisioned to be a large, centrally mounted ramjet engine. Ramjets are air-breathing jet engines that require forward motion to compress incoming air, making them highly efficient at supersonic speeds but unable to produce static thrust.
- Boosted Takeoff: Due to the ramjet's inability to generate thrust at rest, the P.20 would have required an auxiliary propulsion system for takeoff. Options considered included jettisonable Walter HWK 109-509 rocket engines (similar to those used on the Me 163) or even small, temporary turbojet engines to accelerate the aircraft to a speed where the ramjet could operate effectively.
- Fuselage and Cockpit: The fuselage was relatively short and blended into the wing. The pilot would have been seated in a conventional cockpit faired into the upper surface of the fuselage.
- Armament: While specific details were not finalized for a paper project, it was likely intended to carry heavy cannon armament, such as two 30mm MK 108 or MK 103 cannons, to engage bombers.
The P.20 remained a theoretical concept and never progressed beyond the drawing board. No prototypes were built, and the war ended before any significant development could occur.
Significance
Although never built, the Lippisch P.20 is notable for several reasons:
- It showcased Lippisch's advanced aerodynamic thinking and his commitment to the delta-wing concept, which later influenced post-war aircraft designs (e.g., Convair F-102 Delta Dagger, Dassault Mirage series).
- It demonstrated early conceptual integration of ramjet propulsion into a high-performance interceptor design, highlighting Germany's pioneering efforts in advanced propulsion systems during WWII.
- It serves as an example of the radical and desperate proposals considered by the Luftwaffe in the latter stages of the war.
General Characteristics (Projected)
As a concept, exact specifications were fluid, but typical projections included:
- Crew: 1
- Length: Approximately 8-9 meters (26-30 ft)
- Wingspan: Approximately 8-9 meters (26-30 ft)
- Wing Area: Approximately 25-30 m² (270-320 sq ft)
- Powerplant:
- 1 × Ramjet engine (main propulsion)
- Auxiliary rocket or turbojet for takeoff
- Performance (Estimated):
- Maximum Speed: Potentially Mach 0.9+ (possibly supersonic at high altitude)
- Range: Limited by fuel capacity and mission profile
- Service Ceiling: High altitude interceptor, likely 12,000 m (40,000 ft) or more
- Armament (Projected):
- Guns: 2 × 30 mm MK 108 or MK 103 cannons
See Also
- Alexander Lippisch
- Messerschmitt Me 163 Komet
- Ramjet
- List of German aircraft projects, 1939–45