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Mess with your minds: A wind powered craft going faster than a tail wind speed.
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electrodacus:
The ones left here start to become boring. So I will not be back here for some time. Maybe I will be back some time latter to see if you learned something new.
IanB:

--- Quote from: electrodacus on September 03, 2021, 08:31:18 pm ---You are ignoring the fact that power at the motor is lower in real life than power at generator and this powers are opposite.

--- End quote ---

No, I'm not ignoring this. Only very little power is needed by the motor for the M wheel to turn slowly.

You can understand this if we brake the M wheel so it cannot turn. In this case the cart will not move, but the brake also requires zero power while the generator produces lots of power. Now we can take just a little power from the generator to make the M wheel start turning.
electrodacus:

--- Quote from: IanB on September 03, 2021, 08:51:42 pm ---
--- Quote from: electrodacus on September 03, 2021, 08:31:18 pm ---You are ignoring the fact that power at the motor is lower in real life than power at generator and this powers are opposite.

--- End quote ---

No, I'm not ignoring this. Only very little power is needed by the motor for the M wheel to turn slowly.

You can understand this if we brake the M wheel so it cannot turn. In this case the cart will not move, but the brake also requires zero power while the generator produces lots of power. Now we can take just a little power from the generator to make the M wheel start turning.

--- End quote ---

There is no mechanism to brake the motor wheel that will be sniping freely if not connected to G wheel.  On the small treadmill model the wheel and propeller are directly connected and there is no brake. On the large Blackbird there is a freewheel so that propeller can not turn the wheel only the other way around.
In neither of this cases there is any brake. Not that will even be feasible in air (how will you break against air ? With a large parachute?).
You can counteract the movement made by generator with both the motor and propeller but you need to use energy and since energy available is lower than that from generator vehicle will move in the direction that you do not want (right to left).
Brumby:

--- Quote from: electrodacus on September 03, 2021, 08:32:41 pm ---The ones left here start to become boring.
--- End quote ---
You mean threatening of your beliefs.  (It's not science, because you refuse to look at the physics objectively.  You have your preconceptions and you won't even consider exploring any possibility that disagrees with those.)


--- Quote ---So I will not be back here for some time.
--- End quote ---
Yeah, I'd run away now if I were you.


--- Quote ---Maybe I will be back some time latter to see if you learned something new.

--- End quote ---
Maybe if you come back we will see if you have learned something new.



My money is on "No".
Labrat101:
Hi I am Back..
I was racking my brains how to explain how this is Possible  .
First clear your minds and think of a Bumblebee .. Ok you say this is off topic . well not really.
According to all known laws of aviation, there is no way that a bee should be able to fly. Its wings are too small to get its fat little body off the ground. The bee, of course, flies anyway. Because bees don't care what humans think is impossible.  :-+ Yes you ..
That this machine can go faster than the tail wind for only very short time . because .
The wind first pushes it upto the tail wind speed .
Now comes the tricky part . First the wind MUST NOT CHANGE SPEED at the point of acceleration . HARD as wind is variable .
The propeller pitch is changed to the right angle ( those who missed that part in the video watch again) .
now at this moment there is no longer wind pushing from the back . Only from the front . when travelling at the same wind speed .
an air pocket is forming at the front of the machine . Which is at a LOWER air pressure vacuum bubble .  That is rotating round the front in a
kind of whirlpool the centre is now acting like a vacuum suction . The air resistance will drop so there is a state where there is no longer any
front air  drag slowing it down . The Propeller still has air flow & ground power . but the friction lose is smaller .
This is when their Red marker flag moved backwards .
This is the point it enters the Air vortex tunnel . and starts to get sucked as well as the tip velocity of the propeller is at its highest .
and is Now Blowing . Houston we have Go for acceleration .
This will only last while the tail wind remains constant  maybe minute or 2 or just seconds .
When the tail wind speed changes the front air pocked is broken .
The point is it is possible maybe only for short times maybe a few minutes on a good day.
World records have been beaten in micro seconds . So I reckon a minute is a   :-+


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