Lets see who gets the answer to this one...
#1
08-23-2006, 01:02 AM
Join Date: Jun 2005
Location: Ecorse, Michigan
Posts: 3,970
Lets see who gets the answer to this one...
What would happen if you put a plane on a runway sized treadmill?
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The runway sized treadmill is going in reverse and increases speed as throttle is applied.
Would it be able to take off?
I saw this on another site and got mixed reactions.
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The runway sized treadmill is going in reverse and increases speed as throttle is applied.
Would it be able to take off?
I saw this on another site and got mixed reactions.
#4
08-23-2006, 04:23 AM
Join Date: Jun 2005
Location: Ecorse, Michigan
Posts: 3,970
Originally Posted by Badfish
i posted this a while back
the plane would take off, the wheels would just be spinning twice as fast
the plane would take off, the wheels would just be spinning twice as fast
Hey, Matt. Just delete it.
#8
08-23-2006, 09:15 AM
im going to take a walk on the wild side and say it wouldnt. it has no lift. you need wind to get lift. your just sitting still on a treadmill. yes the wheels are going, but it has no up lift from wind. so unless im missing something here this mith is busted. no wind = no flight
#9
08-23-2006, 09:21 AM
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Posts: n/a
Originally Posted by 1 BAD S
im going to take a walk on the wild side and say it wouldnt. it has no lift. you need wind to get lift. your just sitting still on a treadmill. yes the wheels are going, but it has no up lift from wind. so unless im missing something here this mith is busted. no wind = no flight
#10
08-23-2006, 09:54 AM
Originally Posted by zigzagg321
well he said the throttle was applied, meaning the plane is running...so since it gets its thrust from the engines not the wheels... so yeah it can get up to speed and achieve lift.
If the thrust isn't going at all, the plane will go backwards, just like a person standing still on a treadmill and someone turns it on (I'm sure everyone has seen an "AMerica's Funniest Home Video's" about that).
If the planes thrust and the treadmill are equal, the plane will sit at a standstill (just like a normal person running on a treadmill at a gym).
As long as the thrust gets the plane going twice as fast as the treadmill is going, then and only then will the plane lift off! Just like if some one has a treadmill set at a "walk" speed, and they try to run on it!
Make sense?
#11
08-23-2006, 10:17 AM
Originally Posted by Rabbit
It all depends on the speed of the treadmill.
If the thrust isn't going at all, the plane will go backwards, just like a person standing still on a treadmill and someone turns it on (I'm sure everyone has seen an "AMerica's Funniest Home Video's" about that).
If the planes thrust and the treadmill are equal, the plane will sit at a standstill (just like a normal person running on a treadmill at a gym).
As long as the thrust gets the plane going twice as fast as the treadmill is going, then and only then will the plane lift off! Just like if some one has a treadmill set at a "walk" speed, and they try to run on it!
Make sense?
If the thrust isn't going at all, the plane will go backwards, just like a person standing still on a treadmill and someone turns it on (I'm sure everyone has seen an "AMerica's Funniest Home Video's" about that).
If the planes thrust and the treadmill are equal, the plane will sit at a standstill (just like a normal person running on a treadmill at a gym).
As long as the thrust gets the plane going twice as fast as the treadmill is going, then and only then will the plane lift off! Just like if some one has a treadmill set at a "walk" speed, and they try to run on it!
Make sense?
the plane would take off. Yes there would be a force applied pushing the plane backwards, but that could be easily overcome by the force of the planes engines. the speed of the plane would barely be affected, and the plane would be able to take off.
#12
08-23-2006, 10:33 AM
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Posts: n/a
It cant take off, since you said the runway is increased in speed by the increase of the throttle then no. A planes wheels just spin, what moves a plane is the propellers. No matter what, you need wind plus throttle to take the plane off. Thats the purpose of a runway, so the plane can get high speeds to be able to get wind under the wings and lift it, the propellers just power it fast to get more wind.
#13
08-23-2006, 10:42 AM
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if a plane has lift with the wheels off the ground(obviously it does) then the surface it starts on makes no difference as long as it can support the plane's weight. the wheels on a plane free spin...so if the ground beneath the wheels is moving the wheels will follow that but the plane's engines will push the plane regardless.
#15
08-23-2006, 11:55 AM
the plane wont take off. go hop on a treadmill and see what kind of wind resistance you get. you wont even feel any wind. you actually arent moveing anywhere. so there for you have no wind resistance. for example, lets say you have a plane with no wings.you can get the plane going as fast as you want, but it will never lift off. Why? no wings. i dont care if that plane is doing 500 knots. its still just sitting still on the treadmill. sure its got speed, but once again no wind. a plane has to be actually moveing to take off. why dont we just put a huge treadill on an aircraft carrier. so a plane can be doing 1000 knots on a treadmill and not lift off. this is very simple. just remember that wind is the most important thing in flying. without it, your just a falling rock
#16
08-23-2006, 12:00 PM
you can't compare a plane on a treadmill and you on a treadmill. You aren't moving forward when running on a treadmill, the plane will be. So air will be passing by the plane, or "wind." the wheels will just be spinning a lot faster than they usually do.
#17
08-23-2006, 12:06 PM
Originally Posted by theponyfactor
you can't compare a plane on a treadmill and you on a treadmill. You aren't moving forward when running on a treadmill, the plane will be. So air will be passing by the plane, or "wind." the wheels will just be spinning a lot faster than they usually do.
#18
08-23-2006, 12:07 PM
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Originally Posted by theponyfactor
you can't compare a plane on a treadmill and you on a treadmill. You aren't moving forward when running on a treadmill, the plane will be. So air will be passing by the plane, or "wind." the wheels will just be spinning a lot faster than they usually do.
#20
08-23-2006, 12:19 PM
lets say the treadmill is just at a stadstill. then the jet goes full throttle, and the treadmill just keeps up with his speed. the jet will never move this way. lets say the jet is set at 210 knots (average takeoff speed for an airbus). the jet would have to reach 210 knots to just be at a standstill. the jet would have to reach 420 knots to takeoff. so yes it could take off this way. now since i know all the facts, this is an easy answer.
#21
08-23-2006, 12:21 PM
Originally Posted by 1 Bad S
lets say the treadmill is just at a stadstill. then the jet goes full throttle, and the treadmill just keeps up with his speed. the jet will never move this way. lets say the jet is set at 210 knots (average takeoff speed for an airbus). the jet would have to reach 210 knots to just be at a standstill. the jet would have to reach 420 knots to takeoff. so yes it could take off this way. now since i know all the facts, this is an easy answer.
That was my point, if the treadmill speed is equal to the amount of thrust, then the plane will sit still. The thrust has to be higher than the speed of the treadmill for any motion to occur.
here's a quick MS paint picutre to prove it....
any questions?
#22
08-23-2006, 12:21 PM
Originally Posted by bikerjoe
if the treadmill is going back wards then the plane is really not moving so no lift will be created ....am i right??
#23
08-23-2006, 12:24 PM
this part of the question, "The runway sized treadmill is going in reverse and increases speed as throttle is applied." makes you say the plane wont lift off, cuz the treadmill increase its speed with the throttle. but it never says how much speed is added. so once again THERES NOT ENOUGH INFO
#25
08-23-2006, 12:38 PM
true. but if the treadmill increases its speed with the plane, and they both are acheveing the same speed. then the plane will never move an inch. "The runway sized treadmill is going in reverse and increases speed as throttle is applied."
#26
08-23-2006, 12:38 PM
Originally Posted by 1 BAD S
true. but if the treadmill increases its speed with the plane, and they both are acheveing the same speed. then the plane will never move an inch. "The runway sized treadmill is going in reverse and increases speed as throttle is applied."
#27
08-23-2006, 01:01 PM
This whole thread goes back to the old.. "If train A leaves LA at 3:00 and train B leaves Atlanta at 9:00, what time and where will they meet?"
If you don't know how fast they are going, there is no answer. The original question is designed for people to input their own factors (in this case speed) to come up with a result. Which without a GIVEN top speed of the treadmill, is inconclusive!
If you don't know how fast they are going, there is no answer. The original question is designed for people to input their own factors (in this case speed) to come up with a result. Which without a GIVEN top speed of the treadmill, is inconclusive!
#28
08-23-2006, 01:54 PM
lol ok read my post, im 100% sure of my answer.
the original question is SUPPOSED to be: a plane is on a giant treadmill, the tread mill is moving the opposite direction as the plane, always the same speed the pane is traveling, just in the opposite direction. so if the plane is going 5 mph, so is the tread mill, in the opposite direction. can the plane take off
YES
nothing is stopping the plane from taking off, the only thing that is happening as the plane is moving foward, is the wheels are traveling twice as fast. the wheels on a plane are free spinning and have NOTHING to so with the plane taking off.
the engines still are propelling the plane foward. imagine if the plane was flying 3 ft above the tread mill. (wheels up) it would still be going foward correct? if it put its wheels down, it would still be going foward, but the wheels would just be traveling twice as fast
the original question is SUPPOSED to be: a plane is on a giant treadmill, the tread mill is moving the opposite direction as the plane, always the same speed the pane is traveling, just in the opposite direction. so if the plane is going 5 mph, so is the tread mill, in the opposite direction. can the plane take off
YES
nothing is stopping the plane from taking off, the only thing that is happening as the plane is moving foward, is the wheels are traveling twice as fast. the wheels on a plane are free spinning and have NOTHING to so with the plane taking off.
the engines still are propelling the plane foward. imagine if the plane was flying 3 ft above the tread mill. (wheels up) it would still be going foward correct? if it put its wheels down, it would still be going foward, but the wheels would just be traveling twice as fast
#29
08-23-2006, 01:59 PM
Originally Posted by Badfish
lol ok read my post, im 100% sure of my answer.
the original question is SUPPOSED to be: a plane is on a giant treadmill, the tread mill is moving the opposite direction as the plane, always the same speed the pane is traveling, just in the opposite direction. so if the plane is going 5 mph, so is the tread mill, in the opposite direction. can the plane take off
YES
nothing is stopping the plane from taking off, the only thing that is happening as the plane is moving foward, is the wheels are traveling twice as fast. the wheels on a plane are free spinning and have NOTHING to so with the plane taking off.
the engines still are propelling the plane foward. imagine if the plane was flying 3 ft above the tread mill. (wheels up) it would still be going foward correct? if it put its wheels down, it would still be going foward, but the wheels would just be traveling twice as fast
the original question is SUPPOSED to be: a plane is on a giant treadmill, the tread mill is moving the opposite direction as the plane, always the same speed the pane is traveling, just in the opposite direction. so if the plane is going 5 mph, so is the tread mill, in the opposite direction. can the plane take off
YES
nothing is stopping the plane from taking off, the only thing that is happening as the plane is moving foward, is the wheels are traveling twice as fast. the wheels on a plane are free spinning and have NOTHING to so with the plane taking off.
the engines still are propelling the plane foward. imagine if the plane was flying 3 ft above the tread mill. (wheels up) it would still be going foward correct? if it put its wheels down, it would still be going foward, but the wheels would just be traveling twice as fast
#30
08-23-2006, 02:01 PM
Guest
Posts: n/a
Originally Posted by Badfish
lol ok read my post, im 100% sure of my answer.
the original question is SUPPOSED to be: a plane is on a giant treadmill, the tread mill is moving the opposite direction as the plane, always the same speed the pane is traveling, just in the opposite direction. so if the plane is going 5 mph, so is the tread mill, in the opposite direction. can the plane take off
YES
nothing is stopping the plane from taking off, the only thing that is happening as the plane is moving foward, is the wheels are traveling twice as fast. the wheels on a plane are free spinning and have NOTHING to so with the plane taking off.
the engines still are propelling the plane foward. imagine if the plane was flying 3 ft above the tread mill. (wheels up) it would still be going foward correct? if it put its wheels down, it would still be going foward, but the wheels would just be traveling twice as fast
the original question is SUPPOSED to be: a plane is on a giant treadmill, the tread mill is moving the opposite direction as the plane, always the same speed the pane is traveling, just in the opposite direction. so if the plane is going 5 mph, so is the tread mill, in the opposite direction. can the plane take off
YES
nothing is stopping the plane from taking off, the only thing that is happening as the plane is moving foward, is the wheels are traveling twice as fast. the wheels on a plane are free spinning and have NOTHING to so with the plane taking off.
the engines still are propelling the plane foward. imagine if the plane was flying 3 ft above the tread mill. (wheels up) it would still be going foward correct? if it put its wheels down, it would still be going foward, but the wheels would just be traveling twice as fast
hey to all the ppl who dont think the plane can take off: Go put on some roller skates and hop on a treadmill. You'll get it after you do that.