[sweetbmxrider]

the plane has no relation to the ground. its how they work. saying that the plane is still contacting the ground through the tarp has no affect on the plane. i would give the example of removing a dinner table cloth from under a set table....but i feel it will stir up more controversy.

the propeller is pushing/pulling the air in front of it. that is where the force is being applied. even though the plane isn't moving in relation to the ground, its moving in relation to the tarp. the tarp is moving in relation to the ground. i dono. if you over think the subject, you will get frustrated.

Edit: Oh that is a much better explanation SmokingSS. if you read mine, you will probably become dumber...