General > General Technical Chat
Mess with your minds: A wind powered craft going faster than a tail wind speed.
<< < (117/285) > >>
electrodacus:
I made a video about this and created a new post https://www.eevblog.com/forum/chat/veritasium-wrong-about-faster-than-wind-direct-down-wind/
I will release the video in a few days for now is just unlisted but you can watch using the link https://youtu.be/4Hol57vTIkE
Psi:
Whenever I look at attempts to disprove that blackbird can travel continuously downwind faster than the wind. I always come back to the fact that, if a sailboat can do it then how can it suddenly become impossible on land.

Regardless of the design or implementation of blackbird, if it's possible on water, it should be possible on land. And if it is possible on land, how would it be done?

I think the core of the issue is going back to first principles. What the difference between a vehicle going from point A to point B faster than the wind on water vs on land.
Because it's accepted fact that you can do it on water without breaking any physics
PlainName:

--- Quote ---What the difference between a vehicle going from point A to point B faster than the wind on water vs on land.
--- End quote ---

I think the difference is that your sail boat is traveling across the wind, whereas the land vehicle is traveling with the wind. The business of the prop and everything is simply 'cheating' to get the effect of going across the wind (the prop turning) while actually traveling with a following wind. That kind of muddies things and perhaps is a distraction once you start getting into detail.
Kleinstein:
The sailboat explaination is a bit more tricky. There is no doubt a sailboat can go faster than the wind to the side, but an not a 100% sure this is also true for the component with the wind. It may work, but is way more tricky with the aerodynamics than the vehincle on land.
I can absolutely understand that one would have trouble with the explaination base on the sail going around the shaft. I think this is even wrong.

However the case with driving the prop from the wheels is relatively easy - just get the difference between forces and power. This way one can avoid al the complication from aerodynamics and wing profiles.
Psi:
The sail boat travels alternating between an + and - angle to the wind.
Is it farfetched to think of this change in direction happening faster and faster until it appears to travel in a straight line? Assuming you had a sailboat that could change direction instantly with no speed penalty in doing so.
Navigation
Message Index
Next page
Previous page
There was an error while thanking
Thanking...

Go to full version
Powered by SMFPacks Advanced Attachments Uploader Mod