Will this plane take off? - Page 16

Choco · 03-01-2007, 08:18 AM

Quote:

Originally Posted by TTsixxer

What a lame comeback. You obviously didn't comprehend my post, I'm not the only one that noticed.

are your eyes not working either? i quit reading your post because it was irrelevant. if people cant understand the crux of the question, why is putting it in terms of a car gonna help. if you were a teacher, your whole class would fail.

for someone who preaches comprehension, please try to keep up.

lockedfree · 03-01-2007, 08:24 AM

I like how those who have thought of, and discussed this problem in times past and thereby having the advantage, descend from upon their thrones on high to condescend and ridicule those who are just reading this problem for the first time and having difficulty grasping the concept. Must make you all feel real big

Anyhow, for anyone left who still isn't getting it: think of the wheels being there *only* for the purpose of eliminating friction (resistance) from the ground, and think of the plane moving relative to the air - not relative to the ground.

Or think of your chair moving relative to the pole it is tied to, not relative to the ground. That should hopefully clear it up.

Also helps to keep in mind that the conveyor belt could be moving several times faster than the plane, in the opposite direction, and it still wouldnt matter.

tutmondigo · 03-01-2007, 01:22 PM

I can't believe this has gone on for 16 pages already. I threw together a quick diagram to help illustrate this scenario. Lets take a look.

The problem is that the question is faulty. Most likely written by someone who doesn't understand how a plane works and though they were being clever.

In order to produce lift an aircraft requires airspeed. To a casual observer it would seem that the plane will not travel along the X axis due to the treadmill. Unfortunately for that thought the thrust or forward motion of the aircraft is not supplied by the wheels but by it's engines. The wheels on an aircraft only serve to prop it up and provide direction while it is on the ground. The plane WILL move forward on the conveyor. It is not using the ground for traction, but the air. All this scenario would do is test the durability of the wheel assembly at extremely high speed.

In short, yes the plane will fly.

nystateboy15 · 03-01-2007, 01:40 PM

Yes the plane can take off ONLY if:

The wind/running speed is high enough, and turbines are at full boost.

.....maybe

kenshi · 03-01-2007, 08:56 PM

Quote:

Originally Posted by robert_s_hunter

You need to brush up, m'boy.......

A wheel-driven vehicle's speed is measured relative to the ground-plane with which it interacts. Therefore, it's wheel-speed and it's ground-speed would be the same (excluding acceleration or braking skids). Otherwise, speedometers would need a correction factor for the rotation of the Earth!!! It is a moving ground-plane, after all!!!

The wheels will be interacting with a treadmill, not the ground. Consequently the speedometer will not show the speed at which the vehicle is moving relative to the ground unless the treadmill is stationary compared to the ground.

TTsixxer · 03-01-2007, 09:28 PM

Quote:

Originally Posted by Choco

are your eyes not working either? i quit reading your post because it was irrelevant. if people cant understand the crux of the question, why is putting it in terms of a car gonna help. if you were a teacher, your whole class would fail.

for someone who preaches comprehension, please try to keep up.

Communication meltdown I guess, you said that you didn't read past the third line of my post and then made your reply, that's why I called you on your lame comeback. Who in the hell replies to half a post when the whole thing had to be read to understand the point? You think it was irrelevant, but it wasn't. Putting it in car terms means nothing as long as I got my point across which is that when you power the vehicle by means other than its wheels, the vehicle will move up the belt regardless how fast the belt is moving in the opposite direction.

sixtsix · 03-01-2007, 09:30 PM

pic ripped off from nasioc. another forum where this subject has been beaten to death.

robert_s_hunter · 03-01-2007, 10:05 PM

Quote:

Originally Posted by kenshi

The wheels will be interacting with a treadmill, not the ground. Consequently the speedometer will not show the speed at which the vehicle is moving relative to the ground unless the treadmill is stationary compared to the ground.

If we're going to measure a vehicle's speed by your standard, I'm booking my 250R on an air-cargo flight.......

Guiness Book of World's Records, meet the world's fastest 250cc motorcycle!!!

After all, it'll be doing 550mph+........

OreoGaborio · 03-08-2007, 08:21 PM

Huh... this is funny.... i just spotted this in my UserCP.... wonder who this goofball is who takes themselves WAYYYY too seriously:

Latest Reputation Received:
Thread - Will this plane take off?
Date - 02-26-2007 06:09 PM
Comment - So I'm an idiot because I disagree with you, huh faggot?

littlec · 03-08-2007, 08:30 PM

Edit: Nevermind...The plane WILL move

But it wont fly..haha

OreoGaborio · 03-08-2007, 08:39 PM

Nice edit, but I still got your original post in the email

I'm glad you get it now & figured it out so quickly... other's aren't so fortunate

BaileyMoto · 03-08-2007, 09:39 PM

Is the same rationale used if you attack it from this angle?

Belt starts backwards at say 100-150mph while plane sits there with no thrust. As its on the belt at said speed, the plane fires up its engines.

Will the plane continue to move forward until it reaches air speed?

TTsixxer · 03-09-2007, 04:22 AM

Same physics apply.

AEgeus · 03-09-2007, 11:04 AM

Ok what if you took a model plane, made a runway in the back of your pickup truck. You know the throttle position of the controls to make the plane go a consistant 50 MPH in the air. You set it for that. You tether the plane to the beginning of the runway in your truck.

You drive up to 50mph and let the plane go. to the observer the plane is stationary while the truck is moving. Does the plane crash because of no forward movement or does it fly when it reaches the end of the runway.

Conversly I guess you can hold onto the plane, get the vehicle up to 50mph and just let it go facing backwards. does it fly or crash?

WannaMoto · 03-09-2007, 11:32 AM

Quote:

Originally Posted by AEgeus

Ok what if you took a model plane, made a runway in the back of your pickup truck. You know the throttle position of the controls to make the plane go a consistant 50 MPH in the air. You set it for that. You tether the plane to the beginning of the runway in your truck.

You drive up to 50mph and let the plane go. to the observer the plane is stationary while the truck is moving. Does the plane crash because of no forward movement or does it fly when it reaches the end of the runway.

Conversly I guess you can hold onto the plane, get the vehicle up to 50mph and just let it go facing backwards. does it fly or crash?

Not the same problem... and the plane crashing in the wake of the turbulance of the truck does not prove or disprove anything... I'd be surprised if you could get a little model plane to take off from the back of truck going anyspeed at any wind speed