It will take off, however while attempting to match the speed of the airplane, the conveyor belt(which is moot) will suck itself into a black hole. That part is indisputable .
Mythbusters plan to uncover plane on conveyor belt
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Last: 5 yr ago by toucan82
Pred, it still depends on which speed your conveyor is trying to match...
you're assuming that it matches the forward motion of the plane...
if you assume it matches the tangential velocity of the wheels, your conveyor will be traveling at a much faster speed...so fast in fact, that the rolling resistance of the plane must equal the force of thrust (no forward motion, no lift). If you don't want to think theoretically, the belt and/or landing gear will fail, and the plane will not take off.
you're assuming that it matches the forward motion of the plane...
if you assume it matches the tangential velocity of the wheels, your conveyor will be traveling at a much faster speed...so fast in fact, that the rolling resistance of the plane must equal the force of thrust (no forward motion, no lift). If you don't want to think theoretically, the belt and/or landing gear will fail, and the plane will not take off.
uhm...no.
guh?
Her clothes are moot!
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you're assuming that it matches the forward motion of the plane...
Wasn't that the entire premise of the problem?
A plane on a conveyor belt that moves backwards at the same speed of the plane moving forward?
oh my god make it stop!!!!!111!121!2!@11!111!!!11
Not until the non-engineers bow down to the greatness of engineers.
it was never stated in the problem, really...I've assumed both, and I've posted my conclusions for both. IIRC it just says that a conveyor matches the speed of the plane in the opposite direction...wheel speed? ground speed? airspeed? (airspeed was thrown out due to impossibility of a conveyor being able to move in any direction of the compass)
anybody with stars want to find "will it take off"
anybody with stars want to find "will it take off"
Actual speed moving forward relative to the ground of the aircraft (fuselage, wings, etc.)
the failure of the landing gear would be more fun to watch...
...who wants to see a silly old plane leave the ground anyway...that's what they're supposed to do. It would be much more impressive if it was a cow.
...who wants to see a silly old plane leave the ground anyway...that's what they're supposed to do. It would be much more impressive if it was a cow.
I weep for the future.
was...
...did it not actually happen?
...did it not actually happen?
I'd've used it correctly, but I eated it.
http://www.youtube.com/watch?v=-EopVDgSPAk
the guy sounds like an idiot but the 8 year old kid is smart enough to go along with his dad on this....this video should make you non-believers think a little harder
the guy sounds like an idiot but the 8 year old kid is smart enough to go along with his dad on this....this video should make you non-believers think a little harder
Engineers...good.
Non engineers and mythbuster supporters...bad.
Non engineers and mythbuster supporters...bad.
I will test this theory with scale models after my internship (read: I'll have money)
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Think of it this way: A block is on a conveyor belt and you and a friend stand on either side of the belt (not on it) with straps tied to the block. You pull on the straps and move the block forward. As you do this, the conveyor belt activates at the same speed you move forward. As you push the block forward, the belt moves to counteract your movement. However, the force that you and your friend exert on the block overcome the static friction and the brick slides across the belt and moves forward but the block does not move as fast because of the forces exerted by friction. At this point, once the static friction has been overcome, the kinetic friction takes over and kinetic friction is always less than static friction (ie. once the block begins to move along the belt, it is easier to move it than when it was not in motion (relative to the belt)). Thus the block moves forward and you and your friend can pull it all you like.
Now replace the block with a set of wheels with extended axles so you and your friend can grip the bars off the belt.
You push the axle and the belt begins to move at your exact speed backwards. Because the wheel will rotate, you can move it much easier than the block. All that happens to the wheel when you push it forward is that it rotates twice as fast (you pushing it forward and the conveyor rotates it backwards). The two sources of friction will be the friction in the bearings of the axle and the friction between the wheels and the ground to keep the tires from 'rolling with slip'.
EDIT ADD: With that in mind, you and your friend can easily pull the tire forward and with forward motion comes air moving over wings, and thus liftoff.
We are talking about a PLANE - not a block. Also - unless I grew some wings out of my ass your analogy is MOOT.
Pred, the way your assumptions are set up, you don't need to make the conveyor sense the ground speed of the plane...
just set the conveyor to travel at take off speed toward the tail of the plane...it will save you a few bucks, and a heck of a lot of time.
just set the conveyor to travel at take off speed toward the tail of the plane...it will save you a few bucks, and a heck of a lot of time.
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Not until the non-engineers bow down to the gullible engineers.
fify
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I used to be a vehement supporter of the 'it wont take off' side until I had my moment of peripetia. The motion of the plane is independent of how the tires rotate.
Hmm - so I guess there is no relationship between how fast my car goes and the speed of it's wheels.
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We are talking about a PLANE - not a block. Also - unless I grew some wings out of my ass your analogy is MOOT.
Care to explain what part of my analysis & analogy you think it is wrong?
so...who wants to sneak an RC airplane into an airport terminal so we can test this on the moving floor?
I just did - I checked my ass - NO WINGS!!!
in the pooper
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so I guess there is no relationship between how fast my car goes and the speed of it's wheels.
There absolutely IS.
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so I guess there is no relationship between how fast my plane goes and the speed of it's wheels.
There absolutely is NOT.
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Hmm - so I guess there is no relationship between how fast my car goes and the speed of it's wheels.
Wow! You've got a rocket propulsion car? Awesome! If not, the counter-point is irrelevant and defeated.
Rocket pulpulsion is mute
Are engineers born retarded or do they develop that later in life?
Just curious.
Just curious.
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