Author Topic: plane on a conveyor belt? (Read 21981 times)

eagl · « **Reply #90 on:** January 20, 2007, 04:14:11 PM »

The point is that the second ANY force is applied to the plane, the wheel speed jumps to infinity. If there is any delay in the spin-up of the treadmill and wheels, the plane will move which violates the premise that the treadmill will accelerate to match the wheelspin. If the plane is moving, then the treadmill must be moving slower than the wheels are spinning, which violates the whole premise behind the question. And it still results in the wheels and treadmill moving at an infinite speed. Which isn't possible.

The situation described in the question is impossible. There is no way the treadmill could ever instantaneously match the wheel speed because the instant the plane moved forward through the air, the wheels would be turning faster than the treadmill was going, which violates the premise behind the question.

So everyone but HT was wrong

eskimo2 · « **Reply #91 on:** January 20, 2007, 04:17:50 PM »

Quote

Originally posted by eagl
The point is that the second ANY force is applied to the plane, the wheel speed jumps to infinity. If there is any delay in the spin-up of the treadmill and wheels, the plane will move which violates the premise that the treadmill will accelerate to match the wheelspin. If the plane is moving, then the treadmill must be moving slower than the wheels are spinning, which violates the whole premise behind the question. And it still results in the wheels and treadmill moving at an infinite speed. Which isn't possible.

The situation described in the question is impossible. There is no way the treadmill could ever instantaneously match the wheel speed because the instant the plane moved forward through the air, the wheels would be turning faster than the treadmill was going, which violates the premise behind the question.

So everyone but HT was wrong

I bet this infinite strength and speed – no mass treadmill would keep the plane from moving for a while if the wheel and tire also had infinite strength and the bearings would not heat up and yet the mass of the wheel was realistic. The wheel and treadmill would have to accelerate at some insane rate, like maybe 100,000 rpm per second. The amount of rotational energy absorbed into accelerating this super wheel toward an infinite speed would equal the energy delivered by the motor. Clearly, however, this is not what the original question asked. As stated, the question appeared to be based on false assumptions.

eagl · « **Reply #92 on:** January 20, 2007, 04:19:19 PM »

It's like saying "if you put the color blue and red on a scale, which would weigh more?"

It's not a valid question to begin with

lukster · « **Reply #93 on:** January 20, 2007, 04:32:20 PM »

Quote

Originally posted by eagl
It's like saying "if you put the color blue and red on a scale, which would weigh more?"

It's not a valid question to begin with

Since it's a higher frequency blue weighs more.

Mark Luper · « **Reply #94 on:** January 20, 2007, 04:56:59 PM »

Quote

Originally posted by Kurt
A very important feature in modern jets... In the old ones where the plane spun and the fans stood still I used to get awfully sick...

Its like in the old days when they used to spin the radio station and the record stood still. And everyone wondered why DJ's were weird.

Does anyone remember a few years ago when the Earth blew up, and we moved here... And the government decided not to tell the stupider people because they thought that it might effect....

Oh, I've said too much...

LOL!!! That was very, very funny! Thanks Kurt. I havn't laughed that hard in a long time.

Mark

Wes14 · « **Reply #95 on:** January 20, 2007, 04:57:27 PM »

just get me a darn Harrier jet and i can prove a get couls take off that "treadmill"

Golfer · « **Reply #96 on:** January 20, 2007, 05:06:42 PM »

Quote

Originally posted by Wes14
just get me a darn Harrier jet and i can prove a get couls take off that "treadmill"

Here's one for ya...

clicky

Wes14 · « **Reply #97 on:** January 20, 2007, 06:22:42 PM »

thats one bad pilot

waste of a perfectly good jet:furious

Mark Luper · « **Reply #98 on:** January 20, 2007, 06:25:32 PM »

Quote

Originally posted by Wes14
thats one bad pilot

waste of a perfectly good jet:furious

I would think that there was "something" wrong with the jet to make him feel like bailing out of it. I would hate to point a finger at the pilot without knowing all the details.

Mark

Wes14 · « **Reply #99 on:** January 20, 2007, 06:33:04 PM »

if their was a problem wouldnt the pilot be able to compensate (im always loosing an aleron or flap or other things on AH and i dont crash)

Mark Luper · « **Reply #100 on:** January 20, 2007, 06:37:22 PM »

Quote

Originally posted by Wes14
if their was a problem wouldnt the pilot be able to compensate (im always loosing an aleron or flap or other things on AH and i dont crash)

He appeared to be in hover mode or a semi hover mode when I watched the film. Those planes are very unforgiving, from what I hear, in hover mode. I don't think it would take much to upset the cart because it would be flying on nozzles instead of the airflow over the wings. If a nozzle screwed up it would be hard to compensate I would think.

Mark

Wes14 · « **Reply #101 on:** January 20, 2007, 06:39:30 PM »

darn,your right mark

if that pilot dude/gal could hear me i would say sorry:D

john9001 · « **Reply #102 on:** January 20, 2007, 08:46:00 PM »

i think the conveyor belt stopped and the plane fell out of the air.

DREDIOCK · « **Reply #103 on:** January 20, 2007, 08:59:15 PM »

Quote

Originally posted by Kurt

You see, JB88... Flight is not magic as you might believe. Its physics... Just like the physics that say if you drop an 85 pound rock on your bare foot, its going to hurt... Even if you have a conveyor belt.

Sorry I dont buy it.
I dont beleive that if JB88 drops an 85 pound rock on his bare foot that it will hurt.

I wanna see the proof!

Kurt · « **Reply #104 on:** January 20, 2007, 09:13:40 PM »

See Rules #4, #5