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A leading edge cuff, with end fences, installed on an American Aviation AA-1 Yankee as part of a NASA experiment Leading edge cuffs are a fixed aerodynamic device employed on fixed-wing aircraft to modify the airfoil used. They may be either factory-installed or, more commonly, an after-market modification.[1] In most cases a leading edge cuff will "droop" the leading edge of the airfoil. This has the effect of causing the airflow to attach better to the upper surface of the wing at higher angles of attack, thus lowering stall speed. This allows lower approach speeds and shorter landing distances. They may also, depending on cuff location, improve aileron control at low speed. A further benefit is that a cuff may produce a more gradual and gentler stall onset, particularly where the original airfoil had a sharp leading edge shape.[1][2] Where a factory modifies an existing design by the addition of a leading edge cuff it is often due to an identified problem or deficiency in the original airfoil used. One example of this is the American Aviation AA-1 Yankee, which was modified with the addition of a leading edge cuff to become the AA-1A Trainer. This was a result of flying schools operating the Yankee demanding a lower approach speed and gentler stall characteristics from the manufacturer.[3][4][5] Several after-market suppliers of STOL kits make use of leading edge cuffs, in some cases in conjunction with such other aerodynamic devices as wing fences and drooping ailerons.[6] Leading edge cuffs can exert an aerodynamic penalty for the lower stall speed obtained. The amount of the penalty depends on the airfoil design they are installed on and the amount of "droop" that they incorporate. The installation of a leading edge cuff often results in some loss of cruise airspeed. In the case of the modification of the AA-1 Yankee to the AA-1A Trainer the loss of cruise speed amounted to 8 knots or 7%. Better design techniques developed in the 1980s largely mitigated this penalty and leading edge cuffs are used on current high performance light aircraft like the Cirrus SR20 and Lancair Columbia.[3][7] References ^ a b Crane, Dale: Dictionary of Aeronautical Terms, third edition, page 144. Aviation Supplies & Academics, 1997. ISBN 1-56027-287-2 ^ Cox, Jack (November 1988). "Questair Venture, Part Two". http://www.nuventureaircraft.com/JackCoxArticle2.htm. Retrieved 2009-08-08.  ^ a b Aviation Consumer (1989). "Gulfstream Yankee/Trainer AA-1". http://www.grumman.net/cgrcc/aa1.html. Retrieved 2007-11-03.  ^ Skip Stagg (1997). "Grumman Where It All Began". http://www.grumman.net/specific/yankee/grumman-whereitallbegan.html. Retrieved 2007-11-03.  ^ AviationConsumer (undated). "AGAC AA-1". http://web.archive.org/web/20071010110921/http://www.aviationconsumer.com/sample/planereviews.html. Retrieved 2007-11-03.  ^ Horton Inc (undated). "Description of the Horton STOL Kit". http://www.hortonstackdoor.com/stolcraft_description.htm. Retrieved 2009-08-08.  ^ Cessna (2009). "This beauty is more than skin deep.". http://www.cessna.com/single-engine/cessna-400/cessna-400-features.html. Retrieved 2009-08-08.  v • d • e Aircraft components and systems Airframe structure Cabane strut · Canopy · Cruciform tail · Empennage · Fairing · Fabric covering · Flying wires · Former · Fuselage · Interplane strut · Horizontal stabilizer · Jury strut · Leading edge · Longeron · Nacelle · Rear pressure bulkhead · Rib · Spar · Stabilizer · Stressed skin · Strut · Tailplane · Trailing edge · T-tail · Twin tail · Vertical stabilizer · V-tail · Wing root · Wing tip Flight controls Aileron · Airbrake · Artificial feel · Autopilot · Canard · Centre stick · Deceleron · Elevator · Elevon · Electro-hydrostatic actuator · Flaperon · Flight control modes · Fly-by-wire · Gust lock · Rudder · Servo tab · Side-stick · Spoiler · Spoileron · Stabilator · Stick pusher · Stick shaker · Trim tab · Yaw damper · Wing warping · Yoke High-lift and aerodynamic devices Blown flap · Channel wing · Dog-tooth · Flap · Gouge flap · Gurney flap · Krueger flaps · Leading edge cuff · LEX · Slats · Slot · Stall strips · Strake · Vortex generator · Wing fence · Winglet Avionic and flight instrument systems ACAS · Air data computer · Airspeed indicator · Altimeter · Annunciator panel · Attitude indicator · Compass · Course Deviation Indicator · EFIS · EICAS · Flight data recorder · Flight management system · Glass cockpit · GPS · Heading indicator · Horizontal situation indicator · INAS · TCAS · Transponder · Turn and bank indicator · Pitot-static system · Radar altimeter · Vertical Speed Indicator · Yaw string Propulsion controls, devices and fuel systems Autothrottle · Drop tank · FADEC · Fuel tank · Gascolator · Inlet cone · Intake ramp · NACA cowling · Self-sealing fuel tank · Throttle · Thrust lever · Thrust reversal · Townend ring · Wet wing Landing and arresting gear Autobrake · Conventional landing gear · Arrestor hook · Drogue parachute · Landing gear extender · Tricycle gear · Tundra tire · Undercarriage Escape systems Ejection seat · Escape crew capsule Other systems Aircraft lavatory · Auxiliary power unit · Bleed air system · Deicing boot · Emergency oxygen system · Environmental Control System · Hydraulic system · Ice protection system · Landing lights · Navigation light · Passenger service unit · Ram air turbine v • d • e Lists relating to aviation General Timeline of aviation · Aircraft (manufacturers) · Aircraft engines (manufacturers) · Rotorcraft (manufacturers) · Airports · Airlines (defunct) · Civil authorities · Museums Military Air forces · Aircraft weapons · Missiles · Unmanned aerial vehicles (UAVs) · Experimental aircraft Accidents/incidents General · Military · Commercial (airliners) · Deaths Records Airspeed · Distance · Altitude · Endurance · Most-produced aircraft