Originally Posted by
ThaABomb
Personally, I don't think the question is stated very clearly. The question that I THINK is being posed is essentially the same as this question:
Does a car with a spoiler produce downforce when it is on a dyno?
The answer is still no. In both cases, the wheels are spinning but the vehicle is not moving forward relative to the ground or the air. In the airplane case, the the conveyor belt moves backwards beneath the airplane, and because of the forward force applied to the aircraft by its engine, its wheels rotate to match the speed of the conveyor belt, but the plane doesn't move relative to the ground or the air. In the car case, the force of the cars wheels on the dyno rollers accelerate the rollers, so that the speed of the wheels and the speed of the rollers is the same, but the car does not move relative to the ground or the air. In both cases, there is no air flow over the wing/spoiler, so no lift/downforce is produced.
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