Length 14 m. (46 ft., 1 in.) Diameter 1.6 m. (5 ft., 5 in.) Propellants Alcohol and liquid oxygen Thrust 25,400 kg. (56,000 lb.) Velocity 5633 km./hr. (3500 mi./hr.) Altitude Peak of operational trajectory, 89 km. (55 mi.) V-1 [Illustration: 63. Illustration from World War II intelligence report.] GERMAN PILOTLESS AIRCRAFT Warhead: approx. 1000 kg. Fuel filler cap Lifting lug Fuel tank. (Capacity 130 galls. petrol) Wirebound spherical compressed air bottles Grill incorporation shutters & petrol injection jets Impulse duct engine Light alloy nose fairing probably containing compass Launching rail Steel tubular main spar passing through fuel tank Pressed steel wing ribs Sheet steel wing covering Automatic pilot: 3 airdriven gyros: height & range setting controls Pneumatic servo mechanism operating rudder & elevators The German-developed V-1 was an automatically controlled pilotless aircraft for use against Allied cities during World War II. The missile was launched from ground ramps. Once in the air, automatic controls on board the craft took over. The V-1 climbed to a predetermined altitude, followed a compass course, and dove to the ground after a preset distance had been covered. This mid-wing monoplane was powered by a unique pulsejet engine above the rear portion of the fuselage. The relatively low speed of the missile made it easy prey for antiaircraft guns or fighters. The V-1 on exhibit is from the U.S. Air Force, Park Ridge Depot. German Antiaircraft Missiles [Illustration: 64. Rheintochter R-I (Rhine Maiden).] Rheintochter I The Rheintochter I (Rhine Maiden) was intended for use against Allied bomber formations late in World War II. The German ground-to-air rocket was fin-stabilized, and controlled by radio. The flight of the two-stage vehicle was controlled by the four movable vanes on the nose of the craft. The first stage carried the missile away from the launching rail, while the second stage brought the missile up to full speed and propelled it to the target. Both the booster and sustainer engines used solid fuel. After a six-tenths of a second burn, the booster dropped off and the sustainer motor ignited. The missile warhead was housed at the rear of the sustainer stage. Exhaust gases were expelled through six nozzles located between the main fins. The program was abandoned in December 1944, after 82 Rheintochter I rockets had been test fired. By then it had become apparent that the missile could not reach the operational altitude of modern bomber aircraft. Hs-298 [Illustration: 65. Hs-298.] The Hs-298 was designed to combat the Allied bomber threat to wartime Germany. This air-to-air missile could be launched from either fighter or bomber aircraft and was in quantity production early in 1945.