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Title: Brainteaser: There's an airplane on the runway..
Source: Elsewhere
URL Source: http://www.someplaceelse.com
Published: Dec 1, 2005
Author: I have no idea
Post Date: 2005-12-01 01:10:02 by Jhoffa_
Keywords: Brainteaser:, airplane, runway..
Views: 838
Comments: 202

Imagine a plane is sat on the beginning of a massive conveyor belt/travelator type arrangement, as wide and as long as a runway, and intends to take off. The conveyer belt is designed to exactly match the speed of the wheels at any given time, moving in the opposite direction of rotation. There is no wind.

Can the plane take off?

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Anyone else notice that http://Rense.com is down?

It's not really down. It's just cyber-traffic is moving up relative to rense and it only appears down. It hasn't actually landed.

(The Gospel of Jesus Christ is the only true good news)

Starwind  posted on  2005-12-01   1:50:36 ET  Reply   Trace   Private Reply  

see it was your fault :P

It's a dirty, thankless job, but someone has to do it.

(The Gospel of Jesus Christ is the only true good news)

Starwind  posted on  2005-12-01   1:51:41 ET  Reply   Trace   Private Reply  

Can the plane take off?

Absolutely.

Unlike a car, thrust is not generated through the wheels.

Tauzero  posted on  2005-12-01   2:09:54 ET  Reply   Trace   Private Reply  

Yes, and it's easy to explain. Unlike a car or individual walking on slippery ice or a conveyer belt, a plane is propelled by thrust against air resistance and does not require surface friction of whatever may be under it. The plane is pushing itself against the air resistance, not the ground.

Clever question.

Adolf Hitler... "What luck for rulers that men do not think."

John F. Kennedy... "Those who make peaceful revolution impossible will make violent revolution inevitable."

wakeup  posted on  2005-12-01   2:21:03 ET  Reply   Trace   Private Reply  

"That is another way to say, the conveyor moves forward at the exact same speed of the plane, but the wheels never actually rotate."

I believe you misunderstand the question.

"The conveyer belt is designed to exactly match the speed of the wheels at any given time, moving in the opposite direction of rotation."

The wheels roll or "rotate" forward as the conveyer belt moves the "opposite direction."

Try to imagine God holding the plane from moving forward and someone turns on the conveyer belt. The wheels spin, the conveyer belt moves along in the opposite direction yet, the plane is stationary. Now, God lets go and the plane, which was at full throttle, starts to push against the air and begins to move forward. It is irrelevant what the tires or the conveyer belt are doing.

Adolf Hitler... "What luck for rulers that men do not think."

John F. Kennedy... "Those who make peaceful revolution impossible will make violent revolution inevitable."

wakeup  posted on  2005-12-01   2:34:09 ET  Reply   Trace   Private Reply  

"Hmm I'd say.. yes.. because it's about lift and whether there is wind or not there would be airflow under and over the wings?"

The plane would fly but, not for the reasons you imply. You left out a crucial factor. The plane must be propelled forward at a substantial speed in order to lift off the ground.

Your answer seems to imply that the plane would hover like a chopper and depends only on the airflow caused by the engine. The engine propels the plane forward until sufficient airspeed is reached causing the lift factor on the wings you describe.

Adolf Hitler... "What luck for rulers that men do not think."

John F. Kennedy... "Those who make peaceful revolution impossible will make violent revolution inevitable."

wakeup  posted on  2005-12-01   2:48:54 ET  Reply   Trace   Private Reply  

The wheels roll or "rotate" forward as the conveyer belt moves the "opposite direction."

That's actually a physical impossibility, or at least it would indicate the wheels skidding on the conveyer. The plane moves forward (under its thrust, weight resting on the wheels), but no, the wheels don't rotate because the forward motion of the conveyer (keeping pace with the accelerating plane) negates their rotation.

The wheels can't be in physical contact with the conveyor moving forward while the wheels also rotate opposite - two objects in contact moving in opposite directions with shear forces - the wheels would be "peeling out" like a drag racer. But the wheels aren't driven and they don't need to rotate, since the conveyor is pacing the plane's velocity.

It is irrelevant what the tires or the conveyer belt are doing.

From a standpoint of the plane developing lift on its own, yes. The wheels and conveyer were a "red herring". I missed it earlier.

(The Gospel of Jesus Christ is the only true good news)

Starwind  posted on  2005-12-01   2:50:50 ET  Reply   Trace   Private Reply  

"the wheels don't rotate because the forward motion of the conveyer (keeping pace with the accelerating plane) negates their rotation."

Read this again. "The conveyer belt is designed to exactly match the speed of the wheels at any given time, moving in the opposite direction of rotation."

Note that the conveyer belt matches the speed of the wheels, NOT THE PLANE. The wheels roll forward and the conveyer belt moves the opposite directions. No friction, imagine a bike on a treadmill. Tires rolling one way... forward, and the treadmill going the other. Perfectly logical.

Obviously, the question was designed to make you think the plane would spin it's tires in place and go nowhere, like a car on the conveyer belt would do. Cars push against the ground, planes push against the air.

The answer would be too obvious if the conveyer belt moved along with the plane.

Adolf Hitler... "What luck for rulers that men do not think."

John F. Kennedy... "Those who make peaceful revolution impossible will make violent revolution inevitable."

wakeup  posted on  2005-12-01   3:04:53 ET  Reply   Trace   Private Reply  

The conveyer belt is designed to exactly match the speed of the wheels at any given time, moving in the opposite direction of rotation. There is no wind.

Can the plane take off?

When pigs fly so will that plane.

Hey buddy! You got any spare change.

Hmmmmm  posted on  2005-12-01   3:09:30 ET  Reply   Trace   Private Reply  

"Can the plane take off? Absolutely.

Unlike a car, thrust is not generated through the wheels."

Correct.

The wheel and conveyer belt issue was included to confuse. The author knew most folks would think of how a car would react and not consider why planes fly.

Adolf Hitler... "What luck for rulers that men do not think."

John F. Kennedy... "Those who make peaceful revolution impossible will make violent revolution inevitable."

wakeup  posted on  2005-12-01   3:28:35 ET  Reply   Trace   Private Reply  

Note that the conveyer belt matches the speed of the wheels, NOT THE PLANE

The wheels have two speeds in this. A rotational speed which if in contact with the conveyor belt, must be matched and a translational velocity as the plane to which they are attached moves forward.

And there are two directions. The rotational direction of the wheels at the tangential point of contact with the conveyeor (bottom of tire rotates rearward ), in which case the opposite direction of the conveyor would be forward, and consequently shear forces and 'skiding' would exist, if the wheels were driven (but they're not); and the other direction is the translational direction of the wheels (and the plane) - forward, in which case the opposite direction of the conveyor would be rearward.

I 'overanalyzed and overempahsized' the rotational aspects.

The answer would be too obvious if the conveyer belt moved along with the plane.

Oh, idunno, it made a fine red herring as-is, for me anyway :)

(The Gospel of Jesus Christ is the only true good news)

Starwind  posted on  2005-12-01   3:31:58 ET  Reply   Trace   Private Reply  

"....conveyer belt.......moving in the opposite direction of rotation..."

You speak of a stationary tire. The question speaks of a rotating tire. You misunderstand the question.

I clearly see a tire rolling on a conveyer belt. The tire rolls forward the belt moves in the opposite direction, just as a bike tire on a treadmil would behave.

You're tired. We're done.

Adolf Hitler... "What luck for rulers that men do not think."

John F. Kennedy... "Those who make peaceful revolution impossible will make violent revolution inevitable."

wakeup  posted on  2005-12-01   4:13:04 ET  Reply   Trace   Private Reply  

Can the plane take off?

Of course! It doesn't matter what the ground is doing with respect to the wheels, because the wheels don't propel the craft down the runway. The propellor or jet engine cause the plane to move forward and they work just fine even if the ground is moving in the wrong direction. It will just cause the tires to rotate at twice the speed they would normally.

Now I'm going to read the thread and see what everyone else said and whether I've missed something. hehehe

"Liberty is the solution of all social and economic questions." ~~Joseph A. Labadie

Mr Nuke Buzzcut  posted on  2005-12-01   16:03:45 ET  Reply   Trace   Private Reply  

Can the plane take off?

Without reading too many of the responses so far, if I understand right, at whatever speed the plane begins to move forward, the conveyer belt moves backwards.

Assuming the plane is propelled forward by jet or prop engines and not through a drive transmission to the wheels (which would not be a particularly well designed aircraft), then it won't stop the plane from going airborne. The only difference it would make is that the wheels would be spinning twice as fast at the airspeed when it takes off (which I'm assuming won't cause them to blow out, causing the plane to crash).

Pinguinite for Pinguins

Neil McIver  posted on  2005-12-01   16:14:23 ET  Reply   Trace   Private Reply  

I disagree. Forward motion is what provides the wing lift required for a plane to leave the ground. Forward motion keeps a plane aloft. All engine power would be merely transferred to the conveyor belt through the wheels and there would be no forward motion by the plane and its wings, ergo, no take off.

Why should we hear about body bags and deaths. Oh, I mean, it's not relevant. So why should I waste my beautiful mind on something like that? -- Big Mama Bush

wbales  posted on  2005-12-01   16:16:23 ET  Reply   Trace   Private Reply  

Here's another one, a bit harder.

A plane is flying and inside the plane's cabin is a fly which is flying. As we know, the wings of an aircraft are supporting the total weight of the the plane and it's contents.

So... if the fly is flying inside the plane, does the weight of the fly count in the total weight of the aircraft?

Pinguinite for Pinguins

Neil McIver  posted on  2005-12-01   16:24:50 ET  Reply   Trace   Private Reply  

Yes, it's wings are displacing air, which exert downward force on the floor of the plane.

If a shipping company charges by weight, would they have to pay you if you sent some helium?

As for the original problem, is the plane stationary or moving with the conveyor belt? It would need to reach takeoff speed relative to the ground in order to ahieve flight. Even if it's moving, the conveyor belt may be moving enough air that there is insufficient lift (relative speed of air passing over/under wing), but I doubt that would be much of a factor.

And I'm optimistic. See, I think you can be realistic and optimistic at the same time. I'm optimistic we'll achieve -- I know we won't achieve if we send mixed signals. I know we're not going to achieve our objective if we send mixed signals - gwbush

Dakmar  posted on  2005-12-01   16:32:49 ET  Reply   Trace   Private Reply  

I disagree. Forward motion is what provides the wing lift required for a plane to leave the ground. Forward motion keeps a plane aloft. All engine power would be merely transferred to the conveyor belt through the wheels and there would be no forward motion by the plane and its wings, ergo, no take off.

You are wrong on two counts, one of which is significant to the question.

1) Wing lift is created by the pressure differential created by the air passing over the airfoil surface - the top of which is longer, causing the air to move move swiftly than it does across the bottom.

2) The plane would have forward motion thanks to the thrust caused by the engines. The wheels are irrelevant, neutral, just along for the ride. The conveyor could be run at a speed 100 times that of the forward motion of the aircraft and all it would accomplish is making the wheels spin faster before takeoff. Forward motion and thereby wind speed would in no way be affected.

"Liberty is the solution of all social and economic questions." ~~Joseph A. Labadie

Mr Nuke Buzzcut  posted on  2005-12-01   18:22:04 ET  Reply   Trace   Private Reply  

this hurts my brain. ;)

christine  posted on  2005-12-01   18:36:25 ET  Reply   Trace   Private Reply  

The conveyer belt is designed to exactly match the speed of the wheels at any given time, moving in the opposite direction of rotation. There is no wind.

I misread that earlier, the plane would be stationary, so barring a steam catapult or some other b-movie trick, no the plane would not take off. Maybe if the conveyer belt/plane is at a steep angle to the ground and the plane has enough space to pick up the required airspeed for the aerodynamics to kick in.

There is no giant fan?

And I'm optimistic. See, I think you can be realistic and optimistic at the same time. I'm optimistic we'll achieve -- I know we won't achieve if we send mixed signals. I know we're not going to achieve our objective if we send mixed signals - gwbush

Dakmar  posted on  2005-12-01   18:56:29 ET  Reply   Trace   Private Reply  

Where's this runway at. I gotta see it.

That thy beloved may be delivered; save with thy right hand, and hear me.

A K A Stone  posted on  2005-12-01   19:04:47 ET  Reply   Trace   Private Reply  

The plane would have forward motion thanks to the thrust caused by the engines.

Not if it was sitting on a conveyor belt. When taking off, the thrust from the engines propel the plane down the runway overcoming the friction between the wheels and the runway. As speed increases and the plane attains take off speed, lift on the wings pulls the plane up off the ground.

Think of running on ice--there is no traction--no friction to create forward movement despite a lot of thrust. Or think of a car wheel spinning on ice-- lots of thrust--no forward motion.

In this hypothetical, increasing thrust of the engines would only translate into higher wheel and conveyor belt counter rotation. The plane would sit spinning its wheels and the conveyor belt no matter how much thrust was being produced by the engines. The plane would not move. The wheels and the conveyor belt would be doing all the moving--the work and energy of the engines being realized there. The plane would remain stationary and would not, therefore, be able to attain lift rquired for take off.

Why should we hear about body bags and deaths. Oh, I mean, it's not relevant. So why should I waste my beautiful mind on something like that? -- Big Mama Bush

wbales  posted on  2005-12-01   19:14:02 ET  Reply   Trace   Private Reply  

The conveyer belt is magical in this exercise, it neutralizes and thrust from the jet engines by spinning the landing gear wheels. The plane wouldn't care about little spinny wheels and would shoot off into the air much as a similar plane on a concrete runway would do.

And I'm optimistic. See, I think you can be realistic and optimistic at the same time. I'm optimistic we'll achieve -- I know we won't achieve if we send mixed signals. I know we're not going to achieve our objective if we send mixed signals - gwbush

Dakmar  posted on  2005-12-01   19:26:35 ET  Reply   Trace   Private Reply  

Another example:

Suppose I am on a treadmill going at at snails pace. I have no forward motion. There is ZERO relative wind speed on my face as I am stationary.

Now, I turn the treadmill up to 1000 mph and I am running at 1000 mph with it. I still have no forward motion. I would still be stationary and there is ZERO relative wind speed on my face as I remain stationary.

All the energy I am expending is between my feet and the treadmill. If I had wings in this situation, they would be useless.

Why should we hear about body bags and deaths. Oh, I mean, it's not relevant. So why should I waste my beautiful mind on something like that? -- Big Mama Bush

wbales  posted on  2005-12-01   19:28:18 ET  Reply   Trace   Private Reply  

Not if it was sitting on a conveyor belt. When taking off, the thrust from the engines propel the plane down the runway overcoming the friction between the wheels and the runway.

There are too many unaccounted-for factors for this to be a classic brain teaser.

And I'm optimistic. See, I think you can be realistic and optimistic at the same time. I'm optimistic we'll achieve -- I know we won't achieve if we send mixed signals. I know we're not going to achieve our objective if we send mixed signals - gwbush

Dakmar  posted on  2005-12-01   19:28:32 ET  Reply   Trace   Private Reply  

I'm thinking of organizing a Shopping Cart Hockey League, we have millions of acres of abandoned retail around here.

And I'm optimistic. See, I think you can be realistic and optimistic at the same time. I'm optimistic we'll achieve -- I know we won't achieve if we send mixed signals. I know we're not going to achieve our objective if we send mixed signals - gwbush

Dakmar  posted on  2005-12-01   19:30:41 ET  Reply   Trace   Private Reply  

The plane would have forward motion thanks to the thrust caused by the engines.

That is, BTW, very true ONCE AND ONLY AFTER a plane is airborne.

Why should we hear about body bags and deaths. Oh, I mean, it's not relevant. So why should I waste my beautiful mind on something like that? -- Big Mama Bush

wbales  posted on  2005-12-01   19:39:35 ET  Reply   Trace   Private Reply  

I'm thinking of organizing a Shopping Cart Hockey League, we have millions of acres of abandoned retail around here.

I trust no jet engines would be involved.

Why should we hear about body bags and deaths. Oh, I mean, it's not relevant. So why should I waste my beautiful mind on something like that? -- Big Mama Bush

wbales  posted on  2005-12-01   19:43:28 ET  Reply   Trace   Private Reply  

No, but we're having a charity drive for estes rocket motors. They contain chemicals that might just save your life some day.

And I'm optimistic. See, I think you can be realistic and optimistic at the same time. I'm optimistic we'll achieve -- I know we won't achieve if we send mixed signals. I know we're not going to achieve our objective if we send mixed signals - gwbush

Dakmar  posted on  2005-12-01   19:47:03 ET  Reply   Trace   Private Reply  

If the plane is a prop, it might be able to take off. It would be an unusual plane for certain. The propeller air wash over the lifting surfaces could concievably generate enough lift to get the plane airborne, even as the plane had zero velocity.

If it used a high bypass turbo fan jet for it's propulsion, as is typical for jetliners, the answer is never, assumeing there is no headwind at all.

These engines are produce very little thrust, by their basic nature, until foreward velocity begins to cram air for combustion into the nacelle, where the air is slowed down, and hence increased in pressure for the first stage of the compressors to throw into the burners. When stationary, the compressors pull a vacuum in the nacelle and very little combustion can take place.

Then, and only then do you get the massive thrust these engines are renowned for.

BTW it is easy to tell what the design speed of a jet is. If the nacelle (Front intake of the engine) is 90 degrees to the air flow, it is a subsonic design. If the nacelle if angled, supersonic, with the angle matching the sonic shock wave angle generated by the speed of the plane. In other words, the greater the angle of the nacelle, the greater the design speed of the plane.

tom007  posted on  2005-12-01   19:48:04 ET  Reply   Trace   Private Reply  

A jet would throttle up and not give a damn about what the tires were thinking.

And I'm optimistic. See, I think you can be realistic and optimistic at the same time. I'm optimistic we'll achieve -- I know we won't achieve if we send mixed signals. I know we're not going to achieve our objective if we send mixed signals - gwbush

Dakmar  posted on  2005-12-01   19:51:13 ET  Reply   Trace   Private Reply  

Yet another reason this plane wouldn't take off--the jet fan engine.

Why should we hear about body bags and deaths. Oh, I mean, it's not relevant. So why should I waste my beautiful mind on something like that? -- Big Mama Bush

wbales  posted on  2005-12-01   20:02:28 ET  Reply   Trace   Private Reply  

get some bottlerockets and visit your local supermarkey, see if bottle rockets care how fast conveyer belt is turning.

And I'm optimistic. See, I think you can be realistic and optimistic at the same time. I'm optimistic we'll achieve -- I know we won't achieve if we send mixed signals. I know we're not going to achieve our objective if we send mixed signals - gwbush

Dakmar  posted on  2005-12-01   20:08:35 ET  Reply   Trace   Private Reply  

Yes, the engine could care less what the tires are doing, but the fan jets must have O2 to perform . At zero air intake velocity, ie. no foreward motion of the plane, the engine is starved for O2. Remember the nacelle actually slows down the air intake velocity and thus increases the air pressure so the compressor blades can get ahold of it.

One of my Aerospace engineering professors stated that you could stand in front of a fighter jet and keep it from moving with your hands - but is it got a little foreward motion..... you are flying.

He did not mean this literally, but was trying to demonstrate how these engines work. - they are designed to have plenty of high velocity air entering the nacelle.

tom007  posted on  2005-12-01   20:10:39 ET  Reply   Trace   Private Reply  

some bottlerockets and visit

The bottle rockets would fly, no matter what the conveyor was doing. They are a self contained control system. The propellent contains an oxident. Thrust here is independent of external conditions.

tom007  posted on  2005-12-01   20:13:25 ET  Reply   Trace   Private Reply  

How would sitting on conveter belt with wheels spinning be different from idling on tarmac, they still sucking in air. I know I've been on jets that were able to utilise their engines for taxiing, don't tell me they are helpless if they come to a complete stop, I know better.

And I'm optimistic. See, I think you can be realistic and optimistic at the same time. I'm optimistic we'll achieve -- I know we won't achieve if we send mixed signals. I know we're not going to achieve our objective if we send mixed signals - gwbush

Dakmar  posted on  2005-12-01   20:17:16 ET  Reply   Trace   Private Reply  

I know I've been on jets that were able to utilise their engines for taxiing, don't tell me they are helpless if they come to a complete stop, I know better.

They are rendered helpless if sitting on a conveyor belt. That is why so few modern airports have conveyor belt runways.

And anyway, back to the question: if this plane could take off on a moving conveyor belt, we shouldn't need runways at all.

Nope, runways are required for a jet to attain take off speed--that critical moment when airspeed produces enough lift to get the plane off the ground.

On a conveyor belt, the plane would not move. An observer in the control tower would just be watching a stationary jet revving its engines. No forward movement = no lift = no take off.

Why should we hear about body bags and deaths. Oh, I mean, it's not relevant. So why should I waste my beautiful mind on something like that? -- Big Mama Bush

wbales  posted on  2005-12-01   20:47:48 ET  Reply   Trace   Private Reply  

On a conveyor belt, the plane would not move.

Bull, you should watch me take a airboat up a particularly wide escalator sometime. It's all about horsepower vs weight. Don't cheap out on landing gear too, I guess.

And I'm optimistic. See, I think you can be realistic and optimistic at the same time. I'm optimistic we'll achieve -- I know we won't achieve if we send mixed signals. I know we're not going to achieve our objective if we send mixed signals - gwbush

Dakmar  posted on  2005-12-01   20:52:19 ET  Reply   Trace   Private Reply  

On a conveyor belt, the plane would not move. An observer in the control tower would just be watching a stationary jet revving its engines. No forward movement = no lift = no take off.

blast up those jets and unless the conveyer belt is physically restraining the airplane wheels with chains or something the airplane is gonna scoot across a scrolling hanna-barbara inspired runway like it was some sort of joke, it all makes perfect sense now.

And I'm optimistic. See, I think you can be realistic and optimistic at the same time. I'm optimistic we'll achieve -- I know we won't achieve if we send mixed signals. I know we're not going to achieve our objective if we send mixed signals - gwbush

Dakmar  posted on  2005-12-01   20:57:21 ET  Reply   Trace   Private Reply  

blast up those jets and unless the conveyer belt is physically restraining the airplane wheels with chains or something the airplane is gonna scoot across a scrolling hanna-barbara inspired runway like it was some sort of joke, it all makes perfect sense now.

Do not--I repeat--DO NOT--try this at home.

Why should we hear about body bags and deaths. Oh, I mean, it's not relevant. So why should I waste my beautiful mind on something like that? -- Big Mama Bush

wbales  posted on  2005-12-01   21:06:37 ET  Reply   Trace   Private Reply  

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