This may have been posted here before, so apologies if so. Here is a little Physics conundrum:
The problem goes like this:
An aircraft is standing on a runway that can move (a conveyor belt). The aircraft moves in one direction, while the conveyor belt moves in the opposite direction. This conveyor has a control system that tracks the aircraft's speed and tunes the speed of the conveyor to be exactly the same, but in the opposite direction. There is no wind. The pilot begins to add thrust to the engines...
The question is:
Will the plane take off or not?
- Forums
- Cross Site
- The Asylum
- So, will it take off?
So, will it take off?Follow
Take off, you hoser!
I don't know much about aviation, but I assume that the plane must have some kind of velocity to take off and not just thrust....
also a matter of the type of plane.... as some can take off vertically now
unless this is some trick question designed to make the answerer look fooling, in which case I beat you to that long ago
but I answer "No".
also a matter of the type of plane.... as some can take off vertically now
unless this is some trick question designed to make the answerer look fooling, in which case I beat you to that long ago
but I answer "No".
I'd say no.
Need the airflow to provide lift.
Need the airflow to provide lift.
CaptainOmelette the Meaningless wrote:
I'd say no.
Need the airflow to provide lift.
Need the airflow to provide lift.
This is my response also.
publiusvarus wrote:
we all know liberals are well adjusted american citizens who only want what's best for society. While conservatives are evil money grubbing scum who only want to sh*t on the little man and rob the world of its resources.
Debalic wrote:
CaptainOmelette the Meaningless wrote:
I'd say no.
Need the airflow to provide lift.
Need the airflow to provide lift.
This is my response also.
Ditto
If it worked, they'd probably already be doing it on aircraft carriers.
Belkira wrote:
Wow. Regular ol' Joph fan club in here.
Jophiel wrote:
But he doesn't answer the question as it is
Wow... I just learned the most inane thing ever.
And I enjoyed it immensely
And I enjoyed it immensely
Aside from the wind thing (which didn't figure into the answer anyway) what's the difference?
Patrician wrote:
An aircraft is standing on a runway that can move (a conveyor belt). The aircraft moves in one direction, while the conveyor belt moves in the opposite direction. This conveyor has a control system that tracks the aircraft's speed and tunes the speed of the conveyor to be exactly the same, but in the opposite direction. There is no wind. The pilot begins to add thrust to the engines...
The Straight Dope wrote:
A plane is standing on a runway that can move (some sort of band conveyer). The plane moves in one direction, while the conveyer moves in the opposite direction. This conveyer has a control system that tracks the plane speed and tunes the speed of the conveyer to be exactly the same (but in the opposite direction). Can the plane take off?
Belkira wrote:
Wow. Regular ol' Joph fan club in here.
Tsk tsk Jophiel. The internets has a lot to answer for. Why engage brain when you can Google?
Patrician wrote:
Tsk tsk Jophiel. The internets has a lot to answer for. Why engage brain when you can Google?
Belkira wrote:
Wow. Regular ol' Joph fan club in here.
Well now I feel dumb for having got it wrong. ::angry::
I think the real question is can the plane believe it is not butter?
So...a plane doesn't need any airflow, lift or forward momentum to take off? How odd.
publiusvarus wrote:
we all know liberals are well adjusted american citizens who only want what's best for society. While conservatives are evil money grubbing scum who only want to sh*t on the little man and rob the world of its resources.
Debalic wrote:
So...a plane doesn't need any airflow, lift or forward momentum to take off? How odd.
I believe the point was that the needed air flow is not generated by movement on the ground.
In a time of universal deceit, telling the truth is a revolutionary act.
seema more like an engineering question than physics.
Yeah, I get it, it just took a bit and I felt like being obtuse...besides, I never even got to Physics in school so wtf do I know.
publiusvarus wrote:
we all know liberals are well adjusted american citizens who only want what's best for society. While conservatives are evil money grubbing scum who only want to sh*t on the little man and rob the world of its resources.
The plane will not take off. Bernoulli's principle states that lift is generated by the difference in air pressure between the top of the wing and the bottom of the wing. This is caused by the shape of the wing, the bottom being flat, the top being rounded. If there's no wind going past the wings, no lift is generated, and the plane will not fly.
Jophiel wrote:
I managed to be both retarded and entertaining.
Demea the Irrelevant wrote:
The plane will not take off. Bernoulli's principle states that lift is generated by the difference in air pressure between the top of the wing and the bottom of the wing. This is caused by the shape of the wing, the bottom being flat, the top being rounded. If there's no wind going past the wings, no lift is generated, and the plane will not fly.
How about a plane with wings that flap like a bird (as Da Vinci imagined)? That could never fly, right?!
Behold! History has been made with the first ornothopter flight!
Behold! History has been made with the first ornothopter flight!
The Toronto Star wrote:
Yesterday Dr. James DeLaurier, an aeronautical engineer and professor emeritus at the University of Toronto's Institute for Aerospace Studies, fulfilled a lifelong dream, seeing his manned mechanical flapping-wing airplane, or ornithopter, fly — a dream first imagined by Leonardo da Vinci.
And with the successful flight DeLaurier has been lucky enough to touch what many describe as the Holy Grail of aeronautical design, achieving a place for himself, his team of volunteers and students in aviation history.
The flapper, as it's affectionately known, sustained flight over about a third of a kilometre for 14 seconds at about 10:20 a.m. before being hit by a crosswind and almost flipping over, damaging the nose and front wheel on the runway at Downsview Park.
But the flight was long enough to prove DeLaurier's mechanical flapping-wing design for a manned, jet-boosted aircraft works. The successful test flight was longer than the first powered flight by aviation pioneers the Wright brothers in December 1903 that lasted 12 seconds over a windswept beach in North Carolina. Beating that record was enough for DeLaurier.
"It is a perfect day," he said after the flight. "If I have the big one now, I'll die happy."
And with the successful flight DeLaurier has been lucky enough to touch what many describe as the Holy Grail of aeronautical design, achieving a place for himself, his team of volunteers and students in aviation history.
The flapper, as it's affectionately known, sustained flight over about a third of a kilometre for 14 seconds at about 10:20 a.m. before being hit by a crosswind and almost flipping over, damaging the nose and front wheel on the runway at Downsview Park.
But the flight was long enough to prove DeLaurier's mechanical flapping-wing design for a manned, jet-boosted aircraft works. The successful test flight was longer than the first powered flight by aviation pioneers the Wright brothers in December 1903 that lasted 12 seconds over a windswept beach in North Carolina. Beating that record was enough for DeLaurier.
"It is a perfect day," he said after the flight. "If I have the big one now, I'll die happy."
Professor CrescentFresh wrote:
Demea the Irrelevant wrote:
The plane will not take off. Bernoulli's principle states that lift is generated by the difference in air pressure between the top of the wing and the bottom of the wing. This is caused by the shape of the wing, the bottom being flat, the top being rounded. If there's no wind going past the wings, no lift is generated, and the plane will not fly.
Quote:
A plane is standing on a runway that can move (some sort of band conveyer). The plane moves in one direction, while the conveyer moves in the opposite direction. This conveyer has a control system that tracks the plane speed and tunes the speed of the conveyer to be exactly the same (but in the opposite direction). Can the plane take off?
Wow so if I take my car to get an emissions test and they put it on the rollers so it can run in place and put into gear I can stick my head out the window and the wind will blow my toupee off? Cool!
=Cecil Adams wrote:
What gets a plane moving are its propellers or jet turbines, which shove the air backward and thereby impel the plane forward.
So this is really stupid.
If you reword the problem to say that there is a giant fan that blows air in the opposite direction with the exact opposite speed to whatever the plane's turbines are "generating" wind across the plane's wings, then all the people who say that the plane won't take off are perfectly right.
Quote:
The plane will still be moving forward and wind will be going past the wings. The plane is generating speed by pushing against the air, not by pushing against the ground. The only thing different about being on a conveyor belt is that the wheels of the plane will be turning faster as the conveyor belt rolls by.
Assuming i read the question correctly....
The belt would keep it stationary, no movement, no wind, no lift.
That would be the same as running on a treadmill and funny old thing you don't feel a breeze in you face when running on a treadmill.
Since an aircraft wing requires airflow to work (or it would livitate when stationary and start to hover when the Aircraft runs up its engine with the breaks on prior to comencing take off.
Recent Visitors: 365
All times are in CST
Anonymous Guests (365)
- Forums
- Cross Site
- The Asylum
- So, will it take off?
© 2024 Fanbyte LLC