Mechanical Model and Design Guideline of Wind Powered Car and Ship Using Rotary Wings Advancing at Super Wind velocity in Tailwind

Authors

  • Hiroshi Isshiki IMA (Institute of Mathematical Analysis, Osaka, Japan)

Keywords:

Wind powered car or ship, Tailwind, Faster than wind, DDWFTTW

Abstract

DDWFTTW (Dead-DownWind Faster Than The Wind) refers to a wind powered car using rotary wings that runs faster than the wind in tailwind. It was found experimentally by Jack Goodman and was experimentally demonstrated in a nearly perfect form by Rick Cavallaro. A full scale model called Blackbird with weight 200kg and propeller diameter 5m has run at the 2.8 times faster speed than tailwind. On the other hand, the theoretical verification was given by Mark Drela. The absorbed energy through rotation of wheel or water turbine is transferred to air propeller, and the thrust is generated by the air propeller. If the running resistance of the car or ship is sufficiently smaller than the thrust, the car or the ship can advance faster than the tailwind speed. The present paper discusses further using the momentum theory of rotary turbine and propeller and made the subject clearer. Especially, it clarified the problem and direction when applied to a wave powered ship. A reasonable application would bring us a big energy saving effect.

Author Biography

Hiroshi Isshiki, IMA (Institute of Mathematical Analysis, Osaka, Japan)

Representative

References

Wikipedia, Wind-powered vehicle

http://en.wikipedia.org/wiki/Wind-powered_vehicle

ayrshquk, DDFTTW,

https://www.youtube.com/watch?v=aJpdWHFqHm0

M.Frauenfelder, Downwind faster than the wind: Blackbird sets a record

http://makezine.com/downwind_faster_than_the_wind_black/,

News & Views – Letters, Down wind faster than the wind,

http://www.ayrs.org/DWFTTW_from_Catalyst_N23_Jan_2006.pdf

R. Cavallaro, Downwind Faster than the Wind (DWFTTW) Myth Challenge,

https://www.youtube.com/watch?v=xHsXcHoJu-A

Windjet Project, DDW.mov,

https://www.youtube.com/watch?v=5CcgmpBGSCI

Mark Drela, Dead-downwind faster than the wind (DDWFTTW) analysis,

file:///C:/Users/l/Downloads/ddw2%20(1).pdf

H. Isshiki, H. Niizato, Self-Positioning of a Floating Platform, Asian Journal of Engineering and Technology, Volume 02- issue 05, (2014/10).

Bose, N., Windmills - Propulsion for a hydrofoil trimaran, Symp. on Wind Propulsion of Commercial Ships, RINA, 1980

Wikipedia, Betz’s law

http://en.wikipedia.org/wiki/Betz's_law

Wikipedia, Blade element momentum theory

http://en.wikipedia.org/wiki/Blade_element_momentum_theory

Wikipedia, Momentum theory

http://en.wikipedia.org/wiki/Momentum_theory

MIT, 11.7 Performance of Propellers - MIT

http://web.mit.edu/16.unified/www/FALL/thermodynamics/notes/node86.html

Downloads

Published

2015-04-29

How to Cite

Isshiki, H. (2015). Mechanical Model and Design Guideline of Wind Powered Car and Ship Using Rotary Wings Advancing at Super Wind velocity in Tailwind. Asian Journal of Engineering and Technology, 3(2). Retrieved from https://ajouronline.com/index.php/AJET/article/view/2609

Issue

Vol. 3 No. 2 (2015): April 2015

Section

Articles

License

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