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Mess with your minds: A wind powered craft going faster than a tail wind speed.
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IanB:

--- Quote from: electrodacus on December 12, 2021, 12:19:23 am ---I seen many of your comments on this forum and you look more like a troll thus not sure if is worth wasting my time.
--- End quote ---
This is classical troll behavior, switching to ad hominem attacks when you can't debate the issue at hand.

So please don't waste your time. Please just go away and let this thread rest in peace.


--- Quote ---If you think I'm wrong please provide the "correct" equation.
--- End quote ---
You are wrong. I provided the correct analysis above.


--- Quote ---The one Derek provided in his video is clearly wrong as it will make bad predictions for both case A and case C sine his equation include (v-w) instead of the correct (w-v)   w-wind speed v-vehicle speed.
--- End quote ---
Kindly don't change the subject. We are looking at your pictures, not Derek's equations. This is classic troll behavior--when you don't like the answer, switching to a different topic.
Psi:

--- Quote from: fourfathom on December 10, 2021, 10:55:39 pm ---
--- Quote from: electrodacus on December 10, 2021, 10:20:52 pm ---Also there was never a sail based vehicle demonstrated to exceed wind speed directly down wind (not even close not even in ideal case).
--- End quote ---
True.  I don't think that a sailboat can beat a balloon to a goal directly downwind -- even if the boat jibes.

--- End quote ---

That doesn't sound right from what I have read, granted there is lots of misinformation out there and i have not looked into this much. But I was under the impression it was accepted scientific fact that a sailboat can beat a floating balloon in a race from point A to Point B by traveling much faster than the wind (at an angle) and periodically changing directions to enable navigating to point B indirectly. (verses the balloon that travels directly at wind speed).

Is that actually not true?
IanB:

--- Quote from: Psi on December 12, 2021, 03:10:24 am ---That doesn't sound right from what I have read, granted there is lots of misinformation out there and i have not looked into this much. But I was under the impression it was accepted scientific fact that a sailboat can beat a floating balloon in a race from point A to Point B by traveling much faster than the wind (at an angle) and periodically changing directions to enable navigating to point B indirectly. (verses the balloon that travels directly at wind speed).

Is that actually not true?

--- End quote ---

I think it's true. Actually, upon doing a quick search, I came across this article that attempts to unravel the puzzle:

https://www.lockhaven.edu/~dsimanek/museum/ddwfttw.htm

Among other things, the author mentions that sailboats can indeed sail downwind faster than a balloon, if they tack at the right angle.
electrodacus:
I changed my strategy on a different forum so I will do the same here.

The claim of blackbird is that it can travel indefinite well above wind speed and even continue to accelerate.

Now imagine you are in your car traveling on a long strait highway directly downwind at 2x the wind speed and now you pop up a large propeller and connect that to the back wheels.
According to current theory you can stop the engine (no need to waste gasoline) and likely you have extra to even heat or cool the vehicle.

Does this seem reasonable to anyone ?   
IanB:

--- Quote from: electrodacus on December 12, 2021, 03:45:22 am ---I changed my strategy on a different forum so I will do the same here.

The claim of blackbird is that it can travel indefinite well above wind speed and even continue to accelerate.

Now imagine you are in your car traveling on a long strait highway directly downwind at 2x the wind speed and now you pop up a large propeller and connect that to the back wheels.
According to current theory you can stop the engine (no need to waste gasoline) and likely you have extra to even heat or cool the vehicle.

Does this seem reasonable to anyone ?

--- End quote ---

Again, you are trying to change the subject by making false comparisons.

The claim is that the Blackbird can do what it does.

Nobody is claiming you can stick a propeller on a big heavy car on the highway and achieve the same result.

So your question is irrelevant.
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