Will The Plane Take Off?......

[Ralph Wiggum]

I helicopter illustrates this principle perfectly.

Does it need to be moving forward to generate lift? Does ground speed affect lift?

Nope? Why is that?

Because it's aerofoils are moving through the air, the movement generates airspeed over the foil which generates the lift.

Would a helicopter take off on a turntable spinning at the rotor speed required for lift off? thats the real question!!

[Never had any say Panda]

I can't answer that question..

But I imagine the helicopter pilot would be quite sick..

[freeze_dk]

[Wenier]

But don't forget forward speed also aides the helicopter in producing more lift. That is why most don't just go vertically straight up but get some height then add forward speed and you need less effort to get altitude.

But as you have said it can just go straight up with nothing.

[Ralph Wiggum]

So what you're saying is the forward speed helps provide extra airspeed over the aerofoil?

[Never had any say Panda]

Lol....

I think that's what he's saying..

But don't forget the tilt of the rotors also aids in lift.. A helicopter with flattened rotors won't get any lift..

But one at the same RPM with 30 degress of rotor tilt will go upwards quite spectacularly..

[Ralph Wiggum]

30deg's of rotor tilt will cause such a massive increase in rotor torque the Heli will wind up doing the funky chicken...

I run aprox 12deg max on my RC heli's, 1800rpm head speed and 12 degs = awesome lift.

[Never had any say Panda]

Haha yeah.. I was assuming they'd probably snap off..

[_Velocity_]

Wing almost bought in on take off. Must be very light.

[Paulie2256]

This does not apply to the treadmill thread because ship is travelling in the same (no opposite) direction to the plane. It's the air travelling in the opposite direction which is producing lift as many have stated. Had a quick look at the linked threads and the amount of people not understanding the concept of lift concerns me.

Hasn't anyone flown a kite as a kid?

You could have taken off in an A380 like a helicopter in the Philippines the other day.

Edited 13/11/13 04:55 AM by Paulie2256