Man builds wind-propelled craft that travels faster than wind; people online (including physics professors) said he was dumb, he proved them all wrong

[UltimaOnline]

 

[Leongsam]

The secret to understanding why is to realise that the wheels drive the propeller and not the other way round.

 

[Froggy]

 

[syed putra]

This will be in the next america cup with a wind powered propeller.

 

[GOD IS MY DOG]

The secret to understanding why is to realise that the wheels drive the propeller and not the other way round.

huh ??

as in......eat poop......pass out rice ??

 

[tanwahtiu]

Wasting time to prove poo can fly up when u shit.

These Chinese know poo can only drop down from yr arsehole. What's there to prove.

 

[ChanRasjid]

A sail boat (or a balloon) cannot exceed the wind speed as the boat relies on the air molecules hitting the sail from behind for its forward motion. With the propeller vehicle, the speed of the vehicle is not directly a function (depend on) of wind speed alone, but a function of wind speed and frictions in the gears and the wheel axle. The propeller and the wheels are coupled; the propeller turning drives wheels(vehicle) and the wheels turning turns the propeller.

Imagine the vehicle running at the wind speed and the propeller is not turning; friction will slow down the vehicle as there would not be any air molecules hitting the propeller to give it any forward trust. But the propeller is turning driven by the turning wheels; we can conceive of the propeller moving in still air plus the propeller turning giving the vehicle a forward trust pushing the air backwards. It is this forward trust due to the turning propeller that allows the vehicle to go beyond the wind speed. The maximum speed is reached when this thrust is balanced by the total frictional forces.

"E=mc² Is Invalid"
Chan Rasjid Kah Chew,
Singapore.
http://www.emc2fails.com

 

[Leongsam]

A sail boat (or a balloon) cannot exceed the wind speed as the boat relies on the air molecules hitting the sail from behind for its forward motion. With the propeller vehicle, the speed of the vehicle is not directly a function (depend on) of wind speed alone, but a function of wind speed and frictions in the gears and the wheel axle. The propeller and the wheels are coupled; the propeller turning drives wheels(vehicle) and the wheels turning turns the propeller.

Imagine the vehicle running at the wind speed and the propeller is not turning; friction will slow down the vehicle as there would not be any air molecules hitting the propeller to give it any forward trust. But the propeller is turning driven by the turning wheels; we can conceive of the propeller moving in still air plus the propeller turning giving the vehicle a forward trust pushing the air backwards. It is this forward trust due to the turning propeller that allows the vehicle to go beyond the wind speed. The maximum speed is reached when this thrust is balanced by the total frictional forces.

"E=mc² Is Invalid"
Chan Rasjid Kah Chew,
Singapore.
http://www.emc2fails.com

A boat can easily sail faster than the wind.

 

[redbull313]

A boat can easily sail faster than the wind.

go fuck yourself India Forum douchebag

 

[nirvarq]

Like the Gyrocopter it basically uses the wind to move and especially land very safely without engine.

 

[ChanRasjid]

A boat can easily sail faster than the wind.

I just watch the beginning of the video; I think it employs "special tricks" that human can devise. My sailing boat is dumb, just like a balloon blown by the wind and if you say a balloon can go faster than the wind under usual circumstances, I would have to rethink.

 

[Leongsam]

I just watch the beginning of the video; I think it employs "special tricks" that human can devise. My sailing boat is dumb, just like a balloon blown by the wind and if you say a balloon can go faster than the wind under usual circumstances, I would have to rethink.

The reason why sailboats can go quicker than the wind is because the sail is deployed like an aircraft wing and not like a balloon.

 

[ChanRasjid]

The reason why sailboats can go quicker than the wind is because the sail is deployed like an aircraft wing and not like a balloon.

I did have an inkling as I saw a person drawing the shape of an airplane wing.

I believe it requires quite some skill to go faster than the wind, probably with good combination of sea conditions. To use aerodynamics, the sail must be at an angle with the wind direction which means losing some direct thrust; somehow the airplane-wing design could (lifts from difference in pressure) compensate for the lost of direct thrust and is still left with some surplus allowing it to go faster then the wind.

But I do doubt sailors test rigorously if they are really going faster than the wind. They could be getting a lot of speed from the sea currents without knowing.