who here really thinks a plane can take off from a treadmill
#32
How did they do it on mythbusters? Air has to be traveling across the wings at a speed of about 100MPH (?) for it to lift, and then if there's no forward propulsion once it gets airborne, it will immediately fall back to the ground.
#33
I think they had a truck with a looooooooooong piece of material behind it, with an ultra light weight plane on the material facing backwards, the truck went forwards and the plane took off like that, but unlike the internet debate - the plane was moving, it was not stationary like it would be on a treadmill.
#35
http://youtube.com/watch?v=MuXK1nr9_jg
http://youtube.com/watch?v=U9STo3fjfGg
I think there are some other ones just look up mythbusters
http://youtube.com/watch?v=U9STo3fjfGg
I think there are some other ones just look up mythbusters
#36
I think they had a truck with a looooooooooong piece of material behind it, with an ultra light weight plane on the material facing backwards, the truck went forwards and the plane took off like that, but unlike the internet debate - the plane was moving, it was not stationary like it would be on a treadmill.
#37
on mythbusters they put down a long tarp and then the plane was a small perpeller plain.. the otheriside of the the tarp was attached to a pickup truck and both went a speed of 25MPH and the place kept moving a regular distance because the propeller moved the plane not the wheels. So the plane took off like normal. If anything doesn't make sense its because i just got back and im slightly drunk
#38
No, because the speed of the plane eventually overpowered the truck (which wasn't going fast at all) so it had all of the wind it needed.
#39
yah i gotta say that once you see it happen, it is pretty obvious, the question doesent define many parameters
I always assumed that the question was weather or not it would take off with a treadmill movingin the opposite direction, i never though about the plane itself moving forward, probably due to the nature of a treadmill.
A car in that scenario will not move forward because the propulsion comes from the wheels pushing against the ground, and if the ground is moving backwards, well, the car wont actually move forwards
the plane on the other hand uses propulsion but pulling itself against air, the treadmill may be moving, but the air isnt, so when the plane starts up it WILL move forward by pulling itself ahead with its propeller. The treadmill moves 40mph one direction, the plane 40mph the other direction, but the wheel speed is 80mph.
for some reason, i had limited myself to thinking that the treadmill was moving, and the wheels were moving, but the plane was not moving.
I always assumed that the question was weather or not it would take off with a treadmill movingin the opposite direction, i never though about the plane itself moving forward, probably due to the nature of a treadmill.
A car in that scenario will not move forward because the propulsion comes from the wheels pushing against the ground, and if the ground is moving backwards, well, the car wont actually move forwards
the plane on the other hand uses propulsion but pulling itself against air, the treadmill may be moving, but the air isnt, so when the plane starts up it WILL move forward by pulling itself ahead with its propeller. The treadmill moves 40mph one direction, the plane 40mph the other direction, but the wheel speed is 80mph.
for some reason, i had limited myself to thinking that the treadmill was moving, and the wheels were moving, but the plane was not moving.
#40
yah i gotta say that once you see it happen, it is pretty obvious, the question doesent define many parameters
I always assumed that the question was weather or not it would take off with a treadmill movingin the opposite direction, i never though about the plane itself moving forward, probably due to the nature of a treadmill.
A car in that scenario will not move forward because the propulsion comes from the wheels pushing against the ground, and if the ground is moving backwards, well, the car wont actually move forwards
the plane on the other hand uses propulsion but pulling itself against air, the treadmill may be moving, but the air isnt, so when the plane starts up it WILL move forward by pulling itself ahead with its propeller. The treadmill moves 40mph one direction, the plane 40mph the other direction, but the wheel speed is 80mph.
for some reason, i had limited myself to thinking that the treadmill was moving, and the wheels were moving, but the plane was not moving.
I always assumed that the question was weather or not it would take off with a treadmill movingin the opposite direction, i never though about the plane itself moving forward, probably due to the nature of a treadmill.
A car in that scenario will not move forward because the propulsion comes from the wheels pushing against the ground, and if the ground is moving backwards, well, the car wont actually move forwards
the plane on the other hand uses propulsion but pulling itself against air, the treadmill may be moving, but the air isnt, so when the plane starts up it WILL move forward by pulling itself ahead with its propeller. The treadmill moves 40mph one direction, the plane 40mph the other direction, but the wheel speed is 80mph.
for some reason, i had limited myself to thinking that the treadmill was moving, and the wheels were moving, but the plane was not moving.
#42
lol... i know damn good and well the wheels just turn, but i guess i was assuming the plane would be remaining in the same place as a parameter to the question, as if they were asking if the plane sitting on a treadmill would just lift up in the air
#43
Well I wasn't talking about you specifically. Even I didn't really think the plane would take off but sure enough it did
#44
Well you should be, lol, after all i was on here all barking out how stupid someone would have to be to think it was possible!
#50
Which happens to be the speed at which a Cessna 172 Skyhawk achieves enough lift to get it airborne...
Another thing to throw into the equation is temperature and humidity. Cold dense air will make an aircraft lift off far faster and in a shorter distance than hot, humid air...
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PColav6
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02-23-2008 01:30 PM