General > General Technical Chat
Electroboom: How Right IS Veritasium?! Don't Electrons Push Each Other??
<< < (86/148) > >>
electrodacus:

--- Quote from: Naej on July 11, 2022, 08:21:52 pm ---So you agree that you can get much more propulsion out of the propeller than what you took from the wheels, thanks to the wind?
Nice, now you can understand why you can go faster than the wind  8)

--- End quote ---

Have you read my comment ?
I took 100W from the wheels to deliver 70W worth of propulsion.
The other 900W worth of propulsion is done by the wind not the propeller
But 970W total propulsion is still less than 1000W total propulsion if I will not have involved the wheels and 70% efficient propeller.
Naej:

--- Quote from: electrodacus on July 11, 2022, 08:34:04 pm ---
--- Quote from: Naej on July 11, 2022, 08:21:52 pm ---So you agree that you can get much more propulsion out of the propeller than what you took from the wheels, thanks to the wind?
Nice, now you can understand why you can go faster than the wind  8)

--- End quote ---

Have you read my comment ?
I took 100W from the wheels to deliver 70W worth of propulsion.
The other 900W worth of propulsion is done by the wind not the propeller
But 970W total propulsion is still less than 1000W total propulsion if I will not have involved the wheels and 70% efficient propeller.

--- End quote ---
So you agree that you can get much more propulsion (970W) than what you took from the wheels (100W), thanks to the wind (900W) ?
And the car can go much faster than the wind.
electrodacus:

--- Quote from: Naej on July 11, 2022, 08:47:26 pm ---
So you agree that you can get much more propulsion (970W) than what you took from the wheels (100W), thanks to the wind (900W) ?
And the car can go much faster than the wind.

--- End quote ---

Wind was 1000W worth of propulsion before you involved the wheels and propeller so you think 970W is more than 1000W ?
Naej:

--- Quote from: electrodacus on July 11, 2022, 08:52:56 pm ---
--- Quote from: Naej on July 11, 2022, 08:47:26 pm ---
So you agree that you can get much more propulsion (970W) than what you took from the wheels (100W), thanks to the wind (900W) ?
And the car can go much faster than the wind.

--- End quote ---

Wind was 1000W worth of propulsion before you involved the wheels and propeller so you think 970W is more than 1000W ?

--- End quote ---
If you remove the propeller you have 1000W of wind power above your car, and 0W in propulsion… because it's above your car.
If you add the propeller, geared to the wheels you get (at least according to you) 970W in propulsion, and removing the 100W in the wheels you get a nice acceleration.
electrodacus:

--- Quote from: Naej on July 11, 2022, 09:07:02 pm ---If you remove the propeller you have 1000W of wind power above your car, and 0W in propulsion… because it's above your car.
If you add the propeller, geared to the wheels you get (at least according to you) 970W in propulsion, and removing the 100W in the wheels you get a nice acceleration.

--- End quote ---

You can remove the propeller and replace with a sail of equivalent area to get 1000W of wind power that accelerates the vehicle.
Yes propeller looks like a variable area sail based on rotational speed and design starting from the area of the blades when it starts and ending with the max area equivalent to the swept area of the propeller.
You get to max equivalent area way before vehicle gests to wind speed and at that point there is no wind power available no matter how large the area is.
So if you had not stored energy while below wind speed then vehicle could not exceed wind speed.

The vehicle (blackbird) can exceed the wind speed only because of energy storage (pressure differential in this case but can be done in many other ways) and that also means it will have a limited period that the vehicle can spend above wind speed directly proportional with amount of stored energy and inversely proportional with the amount of friction losses.
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