Belly flaps are one of the esential control surfaces in a BWB design. This developes a separation of pressure during take off which helps the aircraft to produce a desired pitching moment. as the aircraft takes on momentum the air undert the wind, in this case the whole aircraft produces lift and produces a nose up moment ( desired) to help with this pitching moment, belly flaps are deployed, this produces a separation of the high pressure air from reaching the aft of the aircraft and this further helping this nose up pitching moment. This is an important part of a BWB design because the BWB design doesnt have a tailplane ( elevator to produce high moment for pitching).
General Engine specification Blog1. It is a turboprop engine- free turbine . This is an engine used in airplanes like DHC-6 Twin Otter 300 Harbin Y-12 Beechcraft This a Pratt and Whitney Canada Engine. One of the most famous and successful company to produce turboprop engine. Compressor It consist of 3 stage axial compressor and 1 stage centrifugal flow compressor. Combustion Annular reverse flow (right to left according to diagram above) combustion with 14 simplex burner (Glow plugs) Turbine 1 stage free power turbine and 1 sage gas generator power turbine.(Left to right according to diagram above) Other specs: Fuel type: aviation kerosine Overall pressure ratio- 6.3:1 Air mass flow: 5.3 lb/s Power to weight ration: 2.14 hp/lb
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