Quote:
Originally Posted by kdoir345
But what im saying is that will the belt not play any role in this whatsoever.
Would it not be like a racecar in a wind tunnel. They set those cars on belts and run them as if they were running full speed but they still have to generate the wind from a fan to get the realistic areodynamic info from the car. Does the forward motion of the plane not do anything, because if it is still does that not mean that there is no air speed?
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Not sure what the wind tunnel speed test on a car has in relation to this. The difference is that the car is not trying to move, it's actually fixed. It's true that the fan is to create wind for aerodynamics testing. The conveyor belt they run on is only to get real world results since a rotating tire drastically changes the way the air flows around the car. A couple pounds of extra drag or miscalculation can cost a car the race by a fraction of a second.
Yes, the belt will play a role in this, as does the forward motion of the plane. The belt will move the aircraft backwards, but once positive thrust is attained, the backwards speed will start decreasing until the plane is at a stand still relative to the air, but the wheels will be moving at conveyor speed. After that, the thrust will starting to move the plane forward (simply continuing it's positive acceleration), with the wheel speed increasing and the airspeed as well. The plane, after a longer than usual distance due to friction will take off.