 In most aircraft designs, climb is achieved (without change in engine power) by pitching the aircraft so that the angle of attack of the wings increases, thereby increasing lift.The Poussin, however, was designed to climb by lowering specially-designed flaps and trimming the tailplane to balance out any change in pitch, therefore allowing the aircraft to achieve its maximum rate of climb while keeping the fuselage within 4° of level.The extra drag created by the lowered flaps was balanced by drag saved by keeping the fuselage level.