BUFC second run.

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Category:

Science & Technology

Tags:

• DDWFTTW
• DDFTTW
• downwind faster than the wind

[wiseguyproductions]

if hes going downwind as the streamers indicate, the blade should be rotating the other way.

[TraderTurok]

@wiseguyproductions

The direction the propeller turns is not determined by the direction of the wind, but by the direction the wheels are turning -- the prop is geared to the wheels and driven by them.

[JimmysCrackhorn]

I could not tell, did he apply brakes or did this reach a max, then slow down to a stop? Would it not be capable of continuing at a factor above TWS or is it required to breach below TWS and gin the needed input energy to once again accelerate through? I am very impressed with this...way to go guys, congratulations...that's some real can-do spirit!!

[TraderTurok]

@JimmysCrackhorn

There were rocks coming up at the end of the lakebed so he applied the brakes to stop.

[njimko23]

It looks to me like the slow acceleration is storing up energy in the spinning propeller. It can then use that energy to go faster than the wind for a little while, but then it slows down to below the wind speed again.

[TraderTurok]

@njimko23

If what you are saying were true, the prop would have to be going *slower* as the vehicle continues to go faster. Notice that the propeller continues to spin faster as the vehicle continues to accelerate to well above windspeed. It's using the power of the wind to accelerate, not any stored energy in the prop.

[Topazman12]

Is there a company making these vehicles? I need one.

[chatsworth777]

The wind / prop provides horsepower. The frontal area provides resistance. If the horsepower has more force than the resistance from the wind, it can sail into the wind. There have been several boats built like this. They use a vertical, rotating "sail". The drag from the wind is less than the "push" from the prop [water]. When they go downwind, they lose relative wind velocity. When they go upwind, the velocity over the sail continuously increases. With low drag, they go faster upwind.

[obliviousfafnir01]

@TraderTurok So the prop acts more as a sail, and spins as the wheels turn it, until it exceeds wind speed and then continues to propel the vehicle faster. Fascinating, but really hard to wrap my brain around ~_^

[op684]

great vid.  what is the location?

[JimmysCrackhorn]

Wow....I'm flummoxed...and really looking forward to seeing what your next level of R&D brings about, and what potential commercial applications this might have. Obviously this is no replacement for a car or an airplane...but the concept might be extrapolated into other areas of wind generated power...way to go American ingenuity!