Airplane physics question

Depending on the coefficient of friction, and the power produced by the engine, of course the plane could skid. The issue is not whether it could. It's just not the situation that is being posed in the question, so why bring it up?

 

Ah, but could conveyer belt counter-skid?


via rubber ducky

 

And if it's wearing underwear, would the skid marks show?

 

On Mars.

 

In a hurricane.

 

At night.

 

No wind . . .


via rubber ducky

 

Yup yup. No wind if you are moving at the speed of the hurricane. In the hurricane. On Mars. At night.

Ducky seems dubious. Is it the, um, rubber?

 

Could be . . .
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Will ducky fly if put on a conveyor belt?

 

His distinguished colleagues have tried, but failed.
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A VERTOL or jumpjet would be able to ascend............

 

Ok. Somewhere between we just can't let this thread die and beating a dead horse, I had this one additional thought while walking through PHL this weekend.

While walking on the horizontal people movers ( escalator but flat) what if a person turned around and walked in the opposite direction of the motion of the conveyor. At exactly the same speed at any point in time in the opposite direction of the conveyor belt.

Would there be any movement of the person realative to fixed ground?

 

Too many variables! Is the earth rotating and are you doing somersaults or cartwheels and did you have beans for lunch...?!

Also, are you attached to an airplane?

If so, how long have you had these feelings?

 

If this is a question about an airplane,,
Why are we using seafaring phrases ?
Flogging and such.

 

Final video proof.

Start 2:45

[ame]http://www.youtube.com/watch?v=Temm5lI-zUI[/ame]

If conveyor belt theory worked, plane could take off without pick up truck moving forward.

Game
Set
Match
Merry Christmas

 

You're describing a treadmill.

All this proves is that the plane doesn't need wheels to fly.

This one is interesting as well.

[ame]http://www.youtube.com/watch?v=KqryALqiQW0&feature=share[/ame]

 

17,000 hour airline pilot. Wheel speed has got nothing to do with it. Aircraft take off and land into the wind to REDUCE distance requirements. The boeings I fly have max wheel speeds around 195kts....We rarely get close to that- with the exception of an emergency configuration that would require higher approach speeds, there is one scenario which I think closely resembles the OP question about tire/wheel speed.....In a high density altitude takeoff -think Mexico city 100f- care must be taken to avoid exceeding 195kts on the tires. The aircraft only cares about the air it lives in-for producing power and relative wind over the wings.

Assume still air. The aircraft will fly at the same indicated speeds. However, at a very high density altitude, an indicated rotation speed of say 140 kts, may actually be a true airspeed of about 175-180.The wheels are spinning at 175-180kts. Go higher or hotter and wheel speed can go off the charts. The aircraft will continue to accelerate forward because the engines and wings could not care less the rate of speed of ground passing beneath.

So in the original OP's question, the wheel speed may exceed 50,000 rpm- doesn't matter. The airplanes gonna accelerate and fly- wheel/tire friction is negligable.

 

Yes, of course the plane flies in real life.
No, of course the plane would not fly if the other condition is being met, that the wheels are not moving forward ie. the plane is sitting still on the conveyor belt.

We all know that both conditions cannot coexist ie. plane moves forward and plane sits still.

The question describes two situations which cannot possibly coexist:
1. Engines producing thrust, AND
2. Wheel speeds matching treadmill speed.

If one is true, the other HAS to be false.

Stupid effing question.

 

Yes or no
?

 

You forgot to give me the third option!

ROFLcopter!

 

#2323

Why do you think that is...reason???

I think not, nor do you.

Play along

 

Two of the hugest myths in history:

I think therefore I am.
There is no such thing as a stupid question.

And, of course, Humpty Dumpty was pushed. We all know that.
Playing, player. Your turn.

 

IIRC, Humpty Dumpty was poached.


via rubber ducky