hello everyone,
leadingedge droop & krugerflaps have the same aim : lift augmentation by increased camber allowing for lower stallspeeds & thus lower approach speeds. both systems have advantages & disadvantages.
krugerflap : advantage : it's retractable, so you get rid of the extra drag in cruise flight.
disadvantage : relatively complex mechanical retraction/extension system & extra weight.
leading edge droop : opposite : mechanical simple & permanent, but extra drag in cruise.
both systems have their over/underpressure zones modified, compared to a normal cambered profile without kruger or le droop.
also the impactpoint(v=0), moves from intrados(wingunderside) to extrados(wingupperside).
eg: b737 has krugerflaps on the inboard leading edges, the venerable french caravelle had leading edge droop.
Last edited by blackmail; 29th Nov 2004 at 10:49.