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

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PlainName:

--- Quote ---Why include a battery in the equation
--- End quote ---

Because we are taking this little step by little step. No massive jump from A to 99, so when we disagree it will be a small specific thing that is easily resolved one way of the other. But we can't do that if you keep taking a running jump to the other playing field, see.

Now, the purpose of having this thing run off batteries is so we are not up against the problem of what powers the thing. We will resolve that later, step by step, but the purpose of these steps right now is to cut away all the distractions.


--- Quote ---For the vehicle to maintain 3m/s with a 2m/s tail wind the battery will need to provide enough power to cover all frictional losses.
--- End quote ---

Trust me, it is a fucking HUGE battery. But if it pleases you we can make it nuclear-powered instead, just in case you're worried about the thing running out of charge.

So, are we at this point agreed that, ignoring how the propeller is powered, the vehicle with a 1m/s prop and a 2m/s tail wind will move forward at close to 3m/s?

electrodacus:

--- Quote from: dunkemhigh on December 26, 2021, 12:51:51 am ---
Trust me, it is a fucking HUGE battery. But if it pleases you we can make it nuclear-powered instead, just in case you're worried about the thing running out of charge.

So, are we at this point agreed that, ignoring how the propeller is powered, the vehicle with a 1m/s prop and a 2m/s tail wind will move forward at close to 3m/s?

--- End quote ---

It is obvious I will agree. You can drive at almost any speed you want if you have a battery.
So what is next ?

fourfathom:

--- Quote from: electrodacus on December 26, 2021, 01:22:17 am ---
--- Quote from: dunkemhigh on December 26, 2021, 12:51:51 am ---
Trust me, it is a fucking HUGE battery. But if it pleases you we can make it nuclear-powered instead, just in case you're worried about the thing running out of charge.

So, are we at this point agreed that, ignoring how the propeller is powered, the vehicle with a 1m/s prop and a 2m/s tail wind will move forward at close to 3m/s?

--- End quote ---

It is obvious I will agree. You can drive at almost any speed you want if you have a battery.
--- End quote ---

That's not the point.  The question is *how* *fast* will the vehicle move under the conditions above.  3 m/s, right?  We are trying to find agreement on forces and speeds.

electrodacus:

--- Quote from: fourfathom on December 26, 2021, 03:02:34 am ---
That's not the point.  The question is *how* *fast* will the vehicle move under the conditions above.  3 m/s, right?  We are trying to find agreement on forces and speeds.

--- End quote ---

We just agreed on an arbitrary number of 3m/s and I said yes it will be possible. What else will you want me to answer ?
Battery is an energy source and since there is no electrochemical  battery on Blackbird I look forward to see what that will be replaced with.

Domagoj T:

--- Quote from: electrodacus on December 25, 2021, 11:22:10 pm ---What powers the propeller when vehicle is above wind speed ? It is a simple question for with you have no answer.

--- End quote ---

The energy which is extracted from slowing down the wind.

On blackbird, the propeller is not a windmill, it's a literal propeller exactly like on an airplane that pushes the air backwards. Effective airspeed speed at the propeller is higher than windspeed, causing the airmass to slow down, which results in excess energy which is used to push the vehicle forwards.

You agreed that the yoyo toy can move faster than the string. Earlier I replaced a hand pulling the string with a sail system that is basically infinite. Sails always move slower than the wind, but the vehicle itself is faster. That model should be perfectly clear.

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