| bigmack000 |
quote:
Originally posted by GOT BOOST
Hi Deathby240,
This is a loaded question with many variables. Does the conveyor belt change speed and respond at the precise moment the aircraft changes speed? Is there a time delay between responses the aircraft changes speed, the time the conveyor senses the change and compensates for it? What is being calculated for the conveyor belt speed. Ie wheel rating, or is there a mathmatical equation that is calculated based on the ammount of thrust the engines are putting out to compensate and increase the speed of the belt to match the speed or calculated speed that will result from the thrust?
I would say that the aircraft would not take off as there would not be enough thrust and movement to have the enough air flow over the wings to create enough lift. If two objects are moving in the same direction as in your example the real speed would be zero. Ie) If you are spinning your tires on ice. Your speedo could be reading 120 km/h but if your car is not moving, you are not travelling that fast.
Regardless how fast the wheels are travelling on the belt, the airspeed travelling over the wings would not be the same.
I believe the plane could take off if it were equiped with engines that would allow the aircraft to take off in a vertial position with the aircraft body still parallel to the ground. Then it may be done.
However if there were a malfunction in the belt causing the convery to slow down, the plane may be able to take off as it may infact have enough wind speed passing over the wings to allow it to lift off.
Alright.......... I will quit my rambeling now :D
Mike Nikolai
mike you make no sesene sorry.
quote:
I would say that the aircraft would not take off as there would not be enough thrust and movement to have the enough air flow over the wings to create enough lift. If two objects are moving in the same direction as in your example the real speed would be zero.
ok now a 737 has 2 CFM56-7 that produce
18,500 to 27,300 pounds thrust depending on the year of make. now the avrage take off speed varing with weight is Boeing 737
100,000 lb
45,360 kg
150 mph
250 km/h
130 kts stall speed
150ktsrotation speed
lets say this is ground speed of the jet.
now the tire's are propbly going faster then the jet so the belt system will match the speed they are at and in that sense the tires would stop moving and just start to burn but the jet is still moving forward. If you think those tires will stop 37 000lbs-54600lbs of thrust form pushing the plane you are wrong. The plane can take off at its stall speed of Stall Speed (Full Flaps and Gear) 130 KIAS (at ground is = to 130knots) so it would get off the ground.
quote:
Ie) If you are spinning your tires on ice. Your Speedo could be reading 120 km/h but if your car is not moving, you are not travelling that fast.
now if your car had a jet on the top of it and was spinning its tires on ice and Speedo said 120km/h. now you kick on the jet and you have an air speed indicator in the car and a pilot tube on the front of the car and it reads whatever number greater or less then the 120km/h. the thing is your being powered by a forward thrust NOT forward torque. So now your car that wasn't moving is.
Same thing goes for the jet doesn’t matter what’s going on underneath the wings. Its irrelevant its getting its forward momentum from thrust not torque
now if it was something along the lines a 737 had 2 jets facing forward and 2 facing back and all 4 were going at full blast would it take off. The answer would be no. Then you would have 2 equal forces in the working in opposite directions so they would cancel each other. |
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| Talontsi96 |
This has got to be a joke...I can't believe people are still not getting it.
I refer you back to the scenario I posted earlier. Imagine you're on rollerblades and on a conveyor thats matching the speed of your rollerblade wheels yet you're holding onto a rope thats anchored on the wall in front of you. Now imagine you and are pulling yourself forward with that rope. Does it matter what speed the conveyor and your rollerblade wheels are going at? You can still pull yourself forward with the rope no matter what the conveyor is doing. The conveyour and the wheels have nothing to do with your forward propulsion when you pull yourself with the rope. This is the same with the plane as it pulls itself forward with air not the ground..
Simple..The plane takes off because there is no counteracting force to stop it from moving forward. |
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| GOT BOOST |
Hi Bigmack000,
Sorry, it made sense to me at the time I was typing. Now that I went back and read it, no it makes no sense at all. :lol:
I see and agree with what you are saying. I must have been thinking of other things while I was replying, went of on a tangent and had become distracted and started typing nonsense. :LOL:
Nice catch on that one. :D
Mike Nikolai |
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| bigmack000 |
quote:
Originally posted by GOT BOOST
Hi Bigmack000,
Sorry, it made sense to me at the time I was typing. Now that I went back and read it, no it makes no sense at all. :lol:
I see and agree with what you are saying. I must have been thinking of other things while I was replying, went of on a tangent and had become distracted and started typing nonsense. :LOL:
Nice catch on that one. :D
Mike Nikolai
lol its all good !:beer: |
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| oldraven |
| Even some of the people who think it will take off are still getting caught up on one thing. Wheel speed is a non issue. That's the entire trick of the riddle. |
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| bigmack000 |
| :p i know its a non issue that why i said what ever is goin on under the wing is irrelevant :P lol the rest of what i said just me blabing haha |
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| Talontsi96 |
quote:
Originally posted by oldraven
Even some of the people who think it will take off are still getting caught up on one thing. Wheel speed is a non issue. That's the entire trick of the riddle.
That is exactly right. The wheels and the conveyor have nothing to do with the forward propulsion of the plane. |
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