spiney.me.uk (in german) http The Natter (Adder) was a World War II era German experimental point-defense rocket-powered interceptor aircraft which was to be used in a very similar way as unmanned surface-to-air missiles. After vertical take-off which eliminated the need for airfields, the majority of the flight to the bombers was radio controlled from the ground. The primary mission of the (inexperienced) pilot was to aim the aircraft at its target bomber and fire its armament of rockets. The pilot and the main rocket engine should then land under separate parachutes, while the wooden fuselage was disposable. The only manned test flight, on 1 March 1945, ended with test-pilot Lothar Sieber being killed. Erich Bachem's BP20 was a development from a design he worked on at Fieseler, but considerably more radical than the other offerings. It was built using glued and screwed wooden parts with an armored cockpit, powered by a Walter HWK 509A-2 rocket, similar to the one in the Me 163. Four jettisonable Schmidding rocket boosters were used for launch, providing a combined thrust of 4800 kgf (47 kN or 10600 lbf) for 10 seconds before they were jettisoned. The plane rode up a rail for about 25 metres, by which time it was going fast enough for the aerodynamic flight controls to keep it flying straight. The plane took off and was guided almost to the bomber's altitude using radio control from the ground, with the pilot taking control right at the end to point the nose in the ...