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The runway is moving under the plane with the plane running. Now the plane is providing itself with a forward motion but since the runway is moving. It's really not moving technically. As I said before if its not moving, now air over wings, no flight.
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Quote:
Originally Posted by Slingshot383
Let me throw in the monkey wrench. The plane is an AV8B Harrier and can take off vertically, it doesn't care about the convyer belt at all.
and neither does any other plane, regardless of it's engine.... doesn't matter what kind of plane it is or how fast the conveyor belt moves, unless the wheels are locked up, it WILL move forward and it WILL eventually take off.
Prop planes can not take off unless they have air moving over their wings. Hence why planes measure their speed with airspeed and not ground speed. I dont know where someone thought that the prop alone can provide enough lift, but that is not true at all. Every plane I have flown hasn't taken off while donig a runup before taking off. That is also the reason planes take off into the wind...they can get a higher airspeed with a lower ground speed, using less runway to take off.
So...if the question is will it take off if the the ground is moving under the plane so as the plane is stationary to the point at which it started. It will NOT take off.
You just explained that air speed is what is the critical issue in creating lift. Perhaps now you could explain how you managed to come to the conclusion that the ground speed issue made take-off impossible???
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The runway is moving under the plane with the plane running. Now the plane is providing itself with a forward motion but since the runway is moving. It's really not moving technically. As I said before if its not moving, now air over wings, no flight.
Imagine the plane is flying over the conveyor at 100 mph and the conveyor is moving at 100 mph in the opposite direction. If that plane lowers it's landing gear and touches down on the conveyor, does it instantly lose all speed? Of course not, it's wheels simply rotate twice as fast as they would if the plane were on a runway. The same applies on takeoff.
The runway is moving under the plane with the plane running. Now the plane is providing itself with a forward motion but since the runway is moving. It's really not moving technically. As I said before if its not moving, now air over wings, no flight.
ONLY if it's the world's first wheel-driven airplane!!!
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I say,"Congratulations!!! You sir, win the Bernoulli Award!!!"
Haha I'm currently an ME major at PSU. I wonder how many of my classmates would get this wrong. I should add knowing the correct answer to the plane/conveyor belt problem to my resume.
Last edited by Stangman33 : 02-26-2007 at 09:54 PM.
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I think this conversation would have ended long ago if there weren't so many people online who were out back behind the school hitting the bong when they should have been in math class.
If the plane is moving forward, what would be the difference in the conveyor matching the planes speed vs. matching the wheels speed. Wouldn't the wheels and the plane be moving at the same speed? Unless the plane leaves the wheels behind.
There is a huge difference between the conveyor matching the rotating speed of the wheels and the speed of the plane. The system consists of the plane, wheels and the conveyor belt.
Haha I'm currently an ME major at PSU. I wonder how many of my classmates would get this wrong. I should add knowing the correct answer to the plane/conveyor belt problem to my resume.
That was my major as well!!! My favorite projects were doing engine research for GM, the Corvette primarily, and aerodynamic studies for NASA's "Space Plane" project.
That said, let's get to the important question,"How often do you stop by the "Ice Cream Studies'" ice cream shop???"........
The resume idea couldn't hurt. After all, look at how many people are baffled by the concept that something can move without being wheel-driven!!!
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Quote:
Originally Posted by R.Brosnan
Imagine the plane is flying over the conveyor at 100 mph and the conveyor is moving at 100 mph in the opposite direction. If that plane lowers it's landing gear and touches down on the conveyor, does it instantly lose all speed? Of course not, it's wheels simply rotate twice as fast as they would if the plane were on a runway. The same applies on takeoff.
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