Whifferdill turn

A whifferdill turn^[1] (also wolferdil, whiferdill, or (chiefly Canadian & British) whifferdale or wifferdale manoeuvre) is any of a number of aerobatic maneuvers performed in an aerial flight show or while flying aggressively. It is a turn with both horizontal and vertical components, usually performed at the end of one maneuver in preparation for the next. As the plane is climbing the pilot makes a turn reversal, and as the plane descends it is turned so that it can make its next maneuver.

Aviators often use the term as slang for any multi-axis movement or comical / interesting / unusual movement.

The whifferdill is a basic aerial warfare maneuver that is used to reverse course in a dogfight with very little loss of energy/airspeed. It is also a fundamental maneuver used in air shows.

Astronautics

In astronautics, a whifferdill is a maneuver used during orbital rendezvous when the target is on a different orbital plane from the piloted vehicle. Due to the nature of orbits, the target will seem to make a helical motion relative to vehicle as the orbit progresses. A wifferdill maneuver is used to quickly realign the orbital plane of the vehicle with the target and stay near the target's orbital position or mean anomaly. Due to the short time and positional requirements, the maneuver uses a significant amount of fuel and can be difficult to execute successfully. In the case of Gemini 10 the need for the maneuver was a result of misalignment of the inertial guidance platform, causing axial drift of the approach trajectory, prior to closing to docking distance.^[2]

References

^ http://www.e-publishing.af.mil/pubfiles/pacaf/11/pacafi11-201/pacafi11-201.pdf#search=%22whifferdill%20turn%22 Archived 2004-10-31 at the Wayback Machine (obsolete, error 404)
^ Collins, Michael (2001). Carrying the Fire: An Astronaut's Journeys. Cooper Square Press. pp. 188, 209–210. ISBN 0-8154-1028-X – via Internet Archive. isbn:081541028X Whifferdill.

v t e Aerobatics
Aircraft	List of aerobatic aircraft
Competitions	European Gliding Championships FAI European Aerobatic Championships FAI World Aerobatic Championships FAI World Grand Prix Red Bull Air Race World Championship World Gliding Championships
Maneuvers	Loop (inside & outside) Aileron roll Barrel roll Cuban eight Falling leaf Hesitation roll Immelmann turn Kulbit Lomcovak Cobra maneuver Slip Spin Split S Stall turn/hammerhead Tailslide Scissors Whifferdill turn Zurabatic cartwheel
Organizations	British Aerobatic Association Fédération Aéronautique Internationale (Aresti Catalog) International Aerobatic Club International Miniature Aerobatic Club
Pilots	Cecilia R. Aragon Hannes Arch Princess Basmah Bani Ahmad Lincoln J. Beachey Péter Besenyei Ladislav Bezák Marta Bohn-Meyer Cristian Bolton Paul Bonhomme Pip Borrman Mikaël Brageot Kirby Chambliss Julie Clark Marion Cole Vicki Cruse Mario de Bernardi Giovanni De Briganti Tommaso Dal Molin Glen Dell Matthias Dolderer Wilhelm Düerkop Walter Extra Markus Feyerabend Gerhard Fieseler Jozef Gabris Michael Goulian Matt Hall Wayne Handley Ray Hanna Charlie Hillard Bob Hoover Bevo Howard Nicolas Ivanoff Nader Jahanbani Petr Jirmus Steve Jones Jurgis Kairys Svetlana Kapanina Sándor Katona Petr Kopfstein Charlie Kulp Anatoly Kvochur Nigel Lamb Amanda Lee Jim LeRoy François Le Vot Leo Loudenslager Nancy Lynn Alejandro Maclean Pete McLeod Jerzy Makula Stanisław Makula Mikhail Mamistov Mike Mangold Scott Manning Catherine Maunoury Yoshihide Muroya Pyotr Nesterov Alexandr Panfierov Ivy May Pearce Adolphe Pégoud František Peřina Tom Poberezny Peter Podlunšek Maciej Pospieszyński Sergey Rakhmanin Amelia Reid Olaf Schmidt Art Scholl Klaus Schrodt Betty Skelton Erde Skip Stewart Martin Šonka Gene Soucy Chris Sperou Victor Tchmal Reinhold Tiling Ferenc Tóth Sean D. Tucker Nick Turvey Ernst Udet Gabor Varga Juan Velarde Frank Versteegh Pavel Vlasov Patty Wagstaff Kermit Weeks Neil Williams Walter Wolfrum Janusz Żurakowski
Other	3D Radio control

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