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Belly flaps

 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).

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