{{Short description|Type of rotating wing, glider or kite}}
== Tumbling Wing == thumb|right|Animation of a tumblewing in flight. A '''tumblewing''' or "'''tumble wing'''" or "'''tumbling wing'''" is a glider or kite wing design which rotates about an axis transverse to the apparent wind, not necessarily horizontal. Tumble wings are frequently employed in wind turbines (such as the Savonius design), and are also used in some types of confetti.
Tumble wings may be made of any material that supports some stiffness for form, such as paper, plastic, metal, composites or wood. Many leaves falling from trees become tumble wing gliders.
=== Areodynamics === Tumbling wings generate lift by alternately flying and stalling as the angle of incidence changes with the spinning motion (see magnus effect and flettner rotor). Its mode of flight is more akin to confetti than traditional fixed-wing aircraft; however, several model aircraft, such as flettner airplanes, have been built with tumbling wings for lift.<ref>{{Cite patent|number=US3380689A|title=Stabilizing system for aircraft|gdate=1968-04-30|invent1=Rudolf|inventor1-first=Bucher|url=https://patents.google.com/patent/US3380689/en}} {{Webarchive|url=https://web.archive.org/web/20220828062308/https://patents.google.com/patent/US3380689/en |date=2022-08-28 }}</ref> Tumble wings are employed as the wing of kite systems, a type of rotary kite, and many such patents exist.<ref>{{cite web |title=Patent US7621484: Rotor kite |url=https://patents.google.com/patent/US7621484 |website=Google Patents |access-date=11 January 2021 |language=en |date=19 July 2007 |archive-date=26 October 2016 |archive-url=https://web.archive.org/web/20161026094920/https://www.google.com/patents/US7621484 |url-status=live }}</ref>
=== Paper plane === The paper plane called the tumbling wing is designed by John Collins also referred to as the "Paper Airplane Guy". The plane is flown by using a piece of cardboard to create a draft which in turn speeds the plane increasing the spinning motion to create lift. Because it does not need ballast, the tumblewing design has a lower wing loading and makes a good walkalong glider which is easy to make and fly.<ref>{{cite book|title=Fantastic flight | year=2004|publisher=10 Speed Press|isbn=1580085776|pages=122–126|author=John M. Collins}}</ref><ref>{{Cite web |url=http://sciencetoymaker.org/tumblewing/index.htm |title=How to build and fly a Big Mouth type tumblewing |access-date=2012-07-15 |archive-date=2012-06-29 |archive-url=https://web.archive.org/web/20120629205741/http://www.sciencetoymaker.org/tumblewing/index.htm |url-status=live }}</ref><ref>{{Cite web |title=TumblingWing folding sequence |url=https://www.youtube.com/watch?v=NewkLeOPa4k |access-date=1 March 2026 |website=Youtube|date=11 December 2021|last=Colins|first=John}}</ref>
== See also == * {{annotated link|Controllable slope soaring}} * {{annotated link|Gliding}} * {{annotated link|History of human-powered aircraft}} * {{annotated link|Orographic lift}} * {{annotated link|Ridge lift}}
==References== <!-- this 'empty' section displays references defined elsewhere --> {{reflist}}
==External links==
<!--(Please arrange in alphabesdfhgbdfvbsdzfxgbstical order! Thank You!)--> * [http://www.origami-kids.com/paperairplanes-2-thevortex1.htm The Vortex I a Tumblewing Glider] * [https://www.youtube.com/watch?v=iob8IcbgJ58 The Paper Airplane Guy teaches how to make the Tumbling Wing] * [http://sciencetoymaker.org/tumblewing/makeTumblewing.htm Tumblewing instructions from sciencetoymaker.org] * [http://sciencetoymaker.org/tumblewing/index.htm How to build and fly a Big Mouth type tumblewing] * [https://sites.google.com/site/controllableslopesoaring/Home/tumblewingpaperairplane/howtofly How to fly a tumblewing type glider] * [https://www.youtube.com/watch?v=kPO7OMzuQpsdfbsdfbsdf Video of Radio Controlled Airplane with tumbling wings] * [https://www.youtube.com/watch?v=al9ERt1PiFY Video of Dihedral Magnus Effect Glider]
{{DEFAULTSORT:Walkalong Glider}} Category:Model aircraft