@Bennet,
Quote:The gadget that determines the speed of the belt can sense the rotation of the wheels and tunes the speed of the conveyer to be exactly the same speed as the wheel.
Ben that doesn't make sense, think about it. It's like saying, "The age of that child is exactly his own age."
Instead, the gadget would have to sense the position of the vehicle, increasing the speed of the belt so as to keep the plane still through wheel/bearing/air friction etc. Probably no conveyor could go fast enough; so without reading the remainder of your post I immediately conclude that of course it will take off. So now let me read it
Quote:Whether jet engines or propeller driven, the plane achieve flight by pulling themselves through the air, where air rushing over the wings gives it lift and enables flight.
In the case of the jet however, where there's no lift without forward motion, when set barely above idling just the friction of the wheel bearing might indeed keep the vehicle still
In the case of the prop plane, the slight lift derived from the engines might reduce the effect of friction between wheel and belt so that it slides off. So whether or not the vehicle takes off depends upon a number of factors, the principal one depending on how high the pilot is allowed to set the throttle when he knows he is still on the conveyor
Quote:On a normal runway, the rotation of the tires results in forward movement, but has no bearing on the behavior of a plane during takeoff.
To the contrary unless I misunderstand you, inflation of the tires, temperature, any incidental contact of a brake pad, bearing friction, etc etc, could have a profound effect
For instance what if the brakes are locked
Quote:With a conveyer belt, regardless of how fast the conveyor belt is counter rotate, the propeller or the jet turbines shove the air backwards and create thrust and this won't let the plane to remain stationary.
To the contrary, see above
Quote:Essentially, the propeller or the jet turbines would continue to provide power to move the aircraft forward, just like it does in the air and how fast the wheels are spinning is irrelevant.
This might be true with a very special set of wheels and a humungous conveyor capable of incredible speed. But the question is whether this is a real situation with real planes and real friction or a theoretical mathematical conjectural transcendental situation as with the ball that is said not to stop at the peak of its trajectory
Quote:The wheels may be spinning at a much higher RPM in this case, but that doesn't affect the plane at all.
Well now, that's under the assumption that the restraining effects of the tire friction/bearing/air resistance, etc, don't depend on RPM. But in fact they do. The faster the belt runs the greater the restraint
Quote:The propellers are pushing against air as opposed to a car where the wheels push against the ground to go,
Irrelevant
Quote:and soon the engines will exert thrust and the aircraft will acquire airspeed,
Forgive me Ben, and no offense by any means, but (forgive any rxepetition) whether the plane escapes the conveyor depends on the whim of the pilot, programming of the gadget that determines the speed of the rollers, the type of airplane,,what kind of engine is involved condition of the tires, their composition, the composition of the belt, where it's situated, etc etc etc etc
Quote:….and will liftoff regardless of the presence of the described high powered conveyor belt.
Gosh now Ben, as you had got me to thinking, I wonder whether I might have achieved a like effect
Not necessarily in this case. Having applied the wheel breaks, or having replaced a lubricated wheel bearings with non lubricated/ rusty wheel bearings won't simulate the conveyor belt to spin as fast. You have forgotten the fact that in the given parameters that the conveyor belt's speed is in synch in with the plane's wheels. In the case with the wheel break, the conveyor belt won't even move, necessarily. In either case, this will lead the conveyor belt to not reach as higher speeds (running respective to these new wheel conditions) as the previous mentioned condition where effects by the wheel is minimal, thus we can conclude slower air movement, thus likely not enough headwind for lift off.
