the deciding factor is the conveyor belt that holds speed with the wheels. If the conveyor belt and the wheels are ALWAYS the same speed, then how the fuck is it gonna move?
note: im not trying to call u stupid man but im not arguing the physics of how a plane works. im arguing that if the belt and wheels always stay the same speed, that the plane wouldnt move. Its simple, has nothing to do with aerospace engineering.
Diarhea? More like making me amazed that these people can even figure out how to get on the internet. I know your 13 year old egos are getting the best of you, and it’s tought to admit you are wrong after you’ve been made to look like a total fool, but it’s really the only option.
anyone that has been on a skateboard on a treadmill knows that while its not much, the treadmill def pulls back on the board. if u were to let go, u would def fall off the back of it. So if the treadmill could move at the same speed as i was, then when i pull myself forward it would simply just speed up and hold me in that position. Its the same thing on a larger scale
The thrust generated from the engines acts upon the plane and the air behind it. The wheels, becuase of the bearings in the axels, are not directly connected to the plane.
Re-read Pass McGrass’s analogy about strapping a rocket to a car. When the rocket is ignited, it will not cause the wheels to spin because it does not directly power the wheels.
IT DOES NOT MATTER.
[size=2]How many times do we have to go over it. As fun as it is to say that spinning wheels will mean it doesn’t move, it’s doesn’t apply to the airplane. The medium that the airplane is moving forward through, and that the force is acting upon is the A-I-R.
The wheels are not powered, they do not push against the belt, they do not in any way shape or form accelerate the airplane. The ONLY force you will get is over coming the friction in the bearings (negligble) and if you want to get picky, the rolling friction of the wheel. But guess what, conveyer or not, a real plane on a real runway has to overcome those as well.
I’m not trying to say you are dumb, I am saying you are dumb.
[/size]
the only relevance to airplanes this has is whether or not u can speed up enough to take off. I dont think the plane would move at all and i HAVE riden a skatboard on a treadmill, and it IS the same thing.
Well I had it already, but I just felt like blaming it on all the smarties in this thread.
Boardjnky- Yes if you put a skateboard on a treadmill it will move back a little bit. If you have someone standing behind you holding you from moving back (just a jet engine at a really low speed, like an idle) then you wont move anywhere. Now have that person give you a HUGE push forward (like the jet engines at full thrust).
Seriously, how do you not understand this? I could explain this to my 4 year old brother (if I had one) and he would laugh at you.
Think of it this way.
You are on a skywalk at the airport (big conveyor belt)
There is a rope above you that you are using hand over hand moving you west.
The skywalk is going east.
You have roller skates on your feet.
You will continue going west even though the skywalk is going east becuase you arms are moving you west via the rope. The wheels on the skates and the speed of the skywalk are always going to be the same no matter what the increase or decrease in speed.
Your arms are the jet motor, the rope is the air, the skates are the wheels of the plane, the skywalk is the conveyor.
I’m giving up on him, I’m all for explaining something, but when someone doesn’t even bother to think before they reply, it’s simply not worth showing them how stupid their though process is.
:sigh:
Anyone else that wants to try is welcome, same result will be met though.
Feel free to ref. this again
yes if the treadmill stays the same speed i will move forward, but if the treadmill varies its speed to keep up with me then i will just stand still. The first thing here, is that it is impossible for the treadmill/belt to instantly adjust to the speed of the wheels. In a real life situation, the wheels will always somewhat advance and spin faster then the belt. Theoretically if the belt and the wheels could simultaneously accelerate then theoretically u wouldnt move
your wrong, in order for u to move, the belt will stay the same speed the whole time, and ur wheels will have to accerate in order to move.
If you did you would have found these helpful pictures.
I’m not even an engineer and I managed to spew that out. I demand a cookie!
The wheels will be moving faster. If the belt is moving at 4mph and you are moving 4mph hand over hand, the wheels are going 8mph.
if the wheels and the conveyor belt are going at the same speed, then whatever is on it, is not gonna move. in order for the thrust to move the plane, the wheels need to spin faster then the belt can move under them.
Boardjnky, READ! http://www.avweb.com/news/columns/191034-1.html
By the way, the belt is matching the speed of the PLANE not the wheels. http://www.avweb.com/news/columns/191034-1.html
hey dumb shit, how about instead of talking about skateboards, you reply to my posts about planes…
That depends on what version you read. Newmans original post said the planes “wheel speed”, which would actually be the ground speed of the airplane, measured relative to the conveyer.