snwtoy wrote:vvega wrote:i ask you this
if the planes wheels are so important to taking off
how dose a harrier do it
how do other VTAL aircraft do it
v
Nice
No, not nice. VTOL aircraft do not apply to this problem what so ever.
In the case of of a plane which takes off vertically, the thrust is pointed vertically downwards. In the case of a helicopter each rotor has an airspeed which enables it to achieve lift (something I think we dont get with the plane on the conveyor). For a VTOL aircraft to take off the trust must equal or better the weight of the aircraft NOT the drag, and in a normal aircraft the thrust must equal or better the DRAG to maintain a constant speed, and also the thrust only need be a fraction of the weight of the aircraft to fly.
Also no, the air flow produced by the propeller is not sufficient for the wings to produce lift (In the case of an aircraft with a single prop at the front of it).
The fact of the matter with the plane on the conveyor belt, is that it needs forward motion to create air flowing over the wings.
And with an aircraft to take off on any surface using wheels, skids or floats, we must rely on the surface it is on to be motionless or at least not moving much at all. Even if it was taking off on lets say a river which could equal the speed (in an opposite direction) of the floats travelling over it the plane would not pull forward.
The movement of the planes wheels is and is not the crux of the matter.
The reason the plane would move down a runway is because its wheels enable it to roll over the surface which does not move. So for an aircraft to take off it has to rely entirely on the fact that the wheels will roll along at a speed faster than the surface it is on, which is of course pulled by the thrust from the propeller. If the wheels roll at the same speed as a runway going in the opposite direction then it will not move forward, no matter the amount of thrust you can get from the engine.
No matter how fast the ground is moving under it the fact a plane will take off is dependant on the air speed. The plane could be reversing at light speed for all it cares but if the foward airspeed is great enough it will take off.
Yes exactly if the forward airspeed is great enough, but in this case there is no airspeed, the plane is not moving forward, and as the question states there is no wind blowing. So I do not know where this airspeed is coming from.
If it were in a wind tunnel that would be a different story. You could get it to fly with 0 ground speed, but the air speed will still need to be XXknots for it to take off.
Confirms my point.
This says nothing about countering every force that the plane creates, all it is doing is spinning the wheels of the plane.
Yes it is spinning the wheels, but the speed at which the wheels are spinning would need to be greater than that of the surface below for the plane to make any headway.
think of it this way
you say there is no thrust
please explane what is happening to the 30,000 off ft punds of thrust been expelled out the back of the plane
please explain why its not pushing on the air molecules
That force of thrust no matter how large, has to be converted through the wheels in order for the plane to move. And how will the plane go forward if the all of that thrust is cancelled out by the conveyor.
Fact of the day: I have only updated my fact of the day on time, Three times.
prove what, lol
