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Tuesday, August 21, 2012

Giant Scale DH Vampire- Two Seat NF.10

This model started out as a VAMPIRE F.1* which crashed on its maiden flight.

Rebuilt eventually in its current form as a two seat NF 10** Vampire

* The Vampire was a neat, distinctive aircraft, featuring a central fuselage pod resembling a stretched egg, a twin-boom tail attached to mid-mounted wings, with short-legged hydraulically-operated tricycle landing gear. All the gear assemblies had single wheels, with the nose wheel retracting backwards and the main gear hinged in the wings to retract outward. The air intakes were in the wing roots, with fuselage plates forward of the intakes to prevent ingestion of stagnant "boundary layer" airflow; the engine was in the rear of the fuselage and exhausted between the tail booms. The twin boom configuration minimized the length of the intake ducting and the exhaust pipe, reducing friction losses. The wings were tapered, with an aileron outboard and a flap split by the tailboom inboard on each wing; there was an airbrake just outboard of the flap, in the form of a panel that popped up into the airflow. All flight controls were unpowered, operated through cable connections. The tailfins were trapezoidal in form, with a straight tailplane between them; the tailplane did not extend outside of the tailfins in the F.1. There was a bumper under the rear of each boom. Most of the fuselage was made of a sandwich of balsa planks between spruce plywood sheets, with the fuselage built in halves over molds using glues; the halves were then kitted up, fitted together, and covered with heavy cloth for painting. De Havilland had developed this technology and put it to good use with the company's Mosquito and Hornet aircraft. The rest of the Vampire was made of metal, mostly aircraft aluminum alloy.s

**TWO-SEAT VAMPIRE NF.10 / T.11 / SEA VAMPIRE T.22 * De Havilland also developed a two-seat version of the Vampire using company funds, designated the "DH.113". The DH.113 had the wings and tail of the single-seat Vampire FB.5 with a new fuselage, stretched by 1.17 meters (46 inches) to accommodate AI.X (US SCR-720B) radar and featuring a cockpit with side-by-side seating, the pilot in the left seat and the navigator / radar operator in the right. The two seats were a tight fit and so they were staggered, with the pilot's seat forward of the navigator / radar operator's seat. The crew sat under a single canopy that hinged up in the rear; ejection seats were not fitted, but the canopy could be jettisoned in an emergency. Since the DH.113's weight was 122 kilograms (270 pounds) greater than that of a single-seat vampire, the uprated Goblin 3 engine was fitted. The DH.113 retained the quad Hispano Mark V 20 millimeter cannon of the single-seaters, and could carry a fuel tank under each wing. It could also carry a bomb under each wing as an alternative external store. Three prototypes were built, the first performing its initial flight on 28 August 1949 with test pilot Geoffrey Pike at the controls; it was appropriately named "Pike's Pig", and flew at the Farnborough air show nine days later. Test flights showed the DH.113 was actually slightly faster than an FB.5, due to the Goblin 3 engine and improved aerodynamics. It was, however, slower than a Meteor night-fighter and had a substantially poorer rate of climb.


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