Half a croissant, on a plate, with a sign in front of it saying '50c'
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Knot Wing

foam strip folded into a mobius knot
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Make a flapping propellor out of a rectangle of foam folded into a mobius knot. It works great.
JesusHChrist, Jan 03 2017

circle wing airplanes, making one of these O wings a mobius strip would slightly, IMO, be less efficient yet could be viewably artistic https://www.google....g&ie=utf-8&oe=utf-8
[beanangel, Jan 03 2017]

Some Propeller Fundamentals, and a blade angle calculator http://n-lemma.com/indoorrc/propcalc.htm
[Voice, Jan 03 2017]

Seems to be many kinds of... https://www.bing.co...us+knot&FORM=HDRSC2
mobias knots. Some might be awful propellers. [popbottle, Jan 04 2017]

[link]






       //It works great.//   

       Pah. You're bluffing. Video or it never happened.
MaxwellBuchanan, Jan 03 2017
  

       circle wing airplanes at [link], making one of these O wings a mobius strip would, IMO, be slightly less efficient yet could be viewably artistic. Flip the thing next to the hull and it might be almost identically efficient.
beanangel, Jan 03 2017
  

       //slightly less efficient//   

       [JHC], when you start getting criticism of feasibility from [beany], you know something, somehow has gone terribly wrong.
MaxwellBuchanan, Jan 03 2017
  

       Flap it how? Spin it in a circle on one of its axes? bend it back and forth along one of its axes? I imagine the twist could serve as a screw, but the physics of various degrees of turning a propeller have been studied out the wazoo. Literally. I am on the john as we speak shitting out studies of propeller twist ratios. That was a lie. I'm actually shitting out a rehash of a tired business ethics paper because my school is not willing to pay for teachers to review original research. It's my fault though, I flunked out of a university that challenged me. Why yes, Ritalin is awesome, thanks for asking.
Voice, Jan 03 2017
  
      
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