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the DDWFTTW phenomenon

Home Forums Research Engineering the DDWFTTW phenomenon

This topic contains 2 replies, has 2 voices, and was last updated by Profile photo of spark spark 2 years, 10 months ago.

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  • #21386
    Profile photo of spark



    I am intrigued by the DDWFTTW phenomenon.




    They are using a wind turbine like propeller on a land sailing device.

    The turbine axle is connected to  drive axle of the vehicle.

    And they can go dead down the wind faster than the wind that repels them, 2.8 times faster.


    Dead against the wind went faster than the wind also.  And they got certified doing it.


    There might be something into this phenomenon.  May be a large sailboat like structure with a few wind turbines on top,

    directly connected to propellers in the water.  The hull speed would limit the final speed.

    The idea worked so well for those guys: http://www.fasterthanthewind.org/2010/02/one-ddwfttw-vehicle-to-go-please.html


    There is some certification of the phenomenon:http://www.nalsa.org/DownWind.html


    Faster than the wind is also recorded in the case of catamarans example AC72 racing records.




    ” The AC72 New Zealand was launched in August 2012 and in trials in early September

    exceeded 40 knots in 17 knots of wind while sailing to windward in small to moderate seas

    with almost no heeling. ”


    And also land sailing  record of greenbird:




    Greenbird set a new landsailing speed record. On March 26, 2009 as 40mph + winds canceled

    NALSA racing and sometimes totally obscured Ivanpah Dry Lake with blowing dust. Richard Jenkins

    piloted Ecotricity’s Greenbird to a new land speed record of 126.2 mph.





    So faster than the wind does happen. And it can be done with wind turbine like engine also.

    I think, slower than the wind would be OK for a large structure.


    This might entertain you too.


    Best wishes;








    Profile photo of Zoltan

    simple logic.. but inginious as long as more force is applied to turning then it is applied to pushhing back the whole thing. Obviously its the case if it can start moving. if it moves.. the wind is faster compared to turbines. then the turbines turn faster.. if same applies then more acceleration. If you “hit” fluids faster they are less fluid so one can expect increase in thrust.. the thing would just accelerate as long as it can.. heating would change some stuff.. friction would be less..


    Profile photo of spark

    Zoltan;  szia hol laksz?  Where do you live?

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