re: Can this 747 take off?

If the speed of the treadmill was over V2 or takeoff speed, what would happen if a "trapdoor" opened and it dropped below the plane. Would the plane then fly?

quote:

---

Of course, just like the plane would move. This is simple physics. There is no force that cancels out the force from the jet. This is essentially the same as asking if a jet will cause motion over a frictionless surface. The answer is yes, because the jet is not relying on transferring power to the ground to move.

---

I don’t think it’s the same as frictionless. There is a force of gravity that the wheels help overcome with the thrust of the jet. If the conveyor is matching the speed then it’s not creating pressure over the wing. It’s hypothetical and they are not saying that the thrust of the jet can double the speed of the conveyor. It’s saying it matches which I would assume is any thrust the jet can create. Over a frictionless surface the plane can take off with concrete blocks.

I feel like a prop plane of some sort could create enough pressure over the wing to create lift but that is not what this example is showing.