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

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bdunham7:

--- Quote from: electrodacus on December 26, 2021, 07:04:44 pm ---because I can understand conservation of energy.

--- End quote ---

No, you really don't and that's where you are failing hard.  You do not understand or correctly apply the basic tenets of junior high-school level physics, namely:

1.  The principles of Archimedes
2.  Newton's laws of motion
3.  The principle of conservation of energy--the one you keep bringing up but clearly have no clue as to how to apply it.

electrodacus:

--- Quote from: gnuarm on December 26, 2021, 11:21:22 pm ---Except my car has no battery and neither does the blackbird.  Also, the blackbird has both a wheel and a propeller while my car ONLY has a wheel. 

--- End quote ---

It was my assumption that you own a Tesla due to referral program mentioned in your signature.
Why do you think a propeller that is less efficient than a wheel can help ? The propeller itself has no advantages over wheels other than it is to travel trough air and it can store energy as pressure differential.



--- Quote from: gnuarm on December 26, 2021, 11:21:22 pm ---Ok, now you are going into pointless details because this is not how the blackbird works.

--- End quote ---

That is exactly how blackbird or any wind powered vehicle works.



--- Quote from: gnuarm on December 26, 2021, 11:21:22 pm ---Nothing, literally NOTHING you have talked about here has to do with the blackbird, so just stop the insanity! 

It is clear that you will never understand anything anyone tells you that doesn't agree with your idea because you reject it out of hand without understanding it. 

I keep coming to the conclusion that you can't be taught anything, but I get suckered in when I see a point that is so crystal clear to anyone else that it must be possible to show it to you.  However, as others have pointed out, instead of understanding what they tell you, you simply duck the issue and start talking about something different. 

So no more replying to your nonsense.

--- End quote ---

The fact that you do not understand how blackbird works will not make all that I mentioned very relevant.
That is about what I think about you but I'm still hopeful.

electrodacus:

--- Quote from: bdunham7 on December 26, 2021, 11:46:46 pm ---No, you really don't and that's where you are failing hard.  You do not understand or correctly apply the basic tenets of junior high-school level physics, namely:

1.  The principles of Archimedes
2.  Newton's laws of motion
3.  The principle of conservation of energy--the one you keep bringing up but clearly have no clue as to how to apply it.

--- End quote ---

OK answer this.

Max wind power available to a direct down wind powered vehicle is when vehicle just starts moving so low speed (Fact 1).
equation for ideal 100% power available to any direct down wind powered vehicle is 0.5 * air density * area * (wind speed - vehicle speed)^3 (Fact 2)

What powers the vehicle when vehicle speed is above wind speed ?

Clearly not wind power (at least not directly but stored wind power).
I'm starting to get very tiered by this level of stupidity.
I asked for the equation showing the available wind power for Blackbird and nobody presented one that will match the observed results in both blackbird and treadmill model.

IanB:

--- Quote from: electrodacus on December 27, 2021, 12:04:05 am ---equation for ideal 100% power available to any direct down wind powered vehicle is 0.5 * air density * area * (wind speed - vehicle speed)^3 (Fact 2)
--- End quote ---

Except:
a) You cannot derive this equation from first principles when asked to do so,
b) You have not pointed to any authoritative source that gives this equation (online or textbook).

Therefore you cannot take this as fact, and if you rely on it all your arguments are flawed.

electrodacus:

--- Quote from: IanB on December 27, 2021, 12:18:45 am ---
--- Quote from: electrodacus on December 27, 2021, 12:04:05 am ---equation for ideal 100% power available to any direct down wind powered vehicle is 0.5 * air density * area * (wind speed - vehicle speed)^3 (Fact 2)
--- End quote ---

Except:
a) You cannot derive this equation from first principles when asked to do so,
b) You have not pointed to any authoritative source that gives this equation (online or textbook).

Therefore you cannot take this as fact, and if you rely on it all your arguments are flawed.

--- End quote ---

It is a fact.  Please provide an equation that you think is correct.
This equation is used everywhere from wind turbine design to vehicle drag so it is one of the most used equations and you can find it literally everywhere.
Your problem seems to be not understanding power and working with forces only not understanding what speed will correspond to get the correct result. 

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