Plane on a Conveyer Belt

[cshaw 10+ year member]

i just cant wait till tonight lol

 

[hoss 5,000+ posts]

im not even going to reply to this thread...

new myth, rocket car on a treadmill, will it move forward?

 

[maldecido33 10+ year member]

The plane can not lift off unless there is air moving past the wings. The wheels can move all **** day but if there is not enough wind speed to force the wings upward the plane will sit on the ground.
On the other end of the spectrum:

If you tied the plane to a pole and placed a huge, high speed fan in front of it the plane would lift off, yet not move forward, like a kite.

This is why they use a wind tunnel to test down force on race cars and not a dynomometer. //content.invisioncic.com/y282845/emoticons/wow.gif.23d729408e9177caa2a0ed6a2ba6588e.gif

Race cars have dependent wheels. //content.invisioncic.com/y282845/emoticons/fyi.gif.9f1f679348da7204ce960cfc74bca8e0.gif

Think about this: a plane is driven by engines on the wings, which generate thrust. The wheels on the plane are like the wheels on a hotwheels car; all that attaches them to the body of the vehicle is an axle/suspension system. The spin completely independent of the plane. When a plane takes off on a runway, it is NOT the wheels of the plane that make it go so fast, it is the thrust generated by the engine. Thus, putting a plane on a conveyer belt the wheels will spin backwards at the same velocity (read as speed and direction) as the conveyor belt. That's right, they will be spinning backwards. Since these wheels are independent of the rest of the plane, the thrust of the engines will propel the plane forward regardless of the speed or direction of plane.

 

[maldecido33 10+ year member]

im not even going to reply to this thread...
new myth, rocket car on a treadmill, will it move forward?

Is the rocket mounted on top of the car propelling it via thrust, or is driving the wheels? If it's driving the wheels, no. If it propels it via thrust, yes.

 

[maldecido33 10+ year member]

i think, no scratch that, everybody knows the wheels have nothing to do with this. the dyno example was to demonstrate that no lift will occur. the plane (due to the weight will stay on the same spot on the belt) and will travel backwards until the plane reaches the same speed of the conveyor belt. at which time it will have no momentum or speed relative to the ground and air. the plane would have to travel faster than the conveyor to go forward.

just getting giant conveyor belt to go the take off speed of a cessna is funny in its own right.

The engines/props of a plane are designed to produce enough force to overcome the weight of a plane.

Thus, your argument is void.

 

[maldecido33 10+ year member]

I wish people would take at least one physics class worth a ****.

By worth a ****, if you don't differentiate or integrate, it's not worth a ****.

 

[DBfan187 5,000+ posts]

new myth, rocket car on a treadmill, will it move forward?

No, the belt will melt and the car will fall & explode.

 

[cshaw 10+ year member]

The engines/props of a plane are designed to produce enough force to overcome the weight of a plane.
Thus, your argument is void.

and will have to work twice as hard to get to take off speed

 

[hoss 5,000+ posts]

Is the rocket mounted on top of the car propelling it via thrust, or is driving the wheels? If it's driving the wheels, no. If it propels it via thrust, yes.

how would a rocket propel the wheels? //content.invisioncic.com/y282845/emoticons/eyebrow.gif.fe2c18d8720fe8c7eaed347b21ea05a5.gif

 

[hoss 5,000+ posts]

No, the belt will melt and the car will fall & explode.

//content.invisioncic.com/y282845/emoticons/laugh.gif.48439b2acf2cfca21620f01e7f77d1e4.gif

and will have to work twice as hard to get to take off speed

fail.

 

[qtipextra 5,000+ posts]

It will NOT take off.

 

[DBfan187 5,000+ posts]

yes IT WILL potato boy!

 

[maldecido33 10+ year member]

and will have to work twice as hard to get to take off speed

Explain, please.

Preferably using something factual; a reference, formula, etc.

how would a rocket propel the wheels? //content.invisioncic.com/y282845/emoticons/eyebrow.gif.fe2c18d8720fe8c7eaed347b21ea05a5.gif

Convert thrust to the driveline? It sounded good at the time

It will NOT take off.

Fail.

 

[maldecido33 10+ year member]

Off to my calculus based physics course, be back later.

 

[shortyg83 10+ year member]

and will have to work twice as hard to get to take off speed

think of it this way. Since the air is what a planes uses to move not the ground picture this.

A car with 2 long bars going through it on each bar there is 4 people pushing the car in one direction. The car is in neutral, and on a conveyor belt. The people pushing the car are not on the belt and start pushing the car 5mph. Now start the conveyor belt to 5 mph and what happens? car keeps moving 5mph, the wheels are spinning 10mph but doesn't matter because the force is being created seperate from the conveyor. Like on a plane the wheels are in neutral and the air gets pulled through the propeller and forces the plane to move.