Back to Freshman year Kinematics based physics. F=ma. Does the block below accelerate?
Actually, the original question I’ve seen all over the web says nothing about WHEEL SPEED Steve, it just says SPEED. Speed = how far the plane moves over a determined period of time (aka, 100 miles in an hour) = it is moving relative to the air, and the wings are generating lift.
a plane will fly if you have the threadmill moving in an opposite direction when you surpass the speed of the treadmill so that can work and happen i do not disagree with anyone there,.
Really? I thought it did, my bad… ignore my posts then 
Does the plane move? Thus creating airflow over the wings, lift, and takeoff?
the plane will not take off the ground.
reason - the plane and the treadmill are supposed to be going the same MPH.
the plane would have to go faster than the treadmills speed in order to achieve positve motion = lift = take off.
in this question the plane is measured in MPH, so for example get the plane going down the run way, right as it lifts, hit it with the radar gun, FOR EXAMPLE 120mph.
at 120 mph look that the RPM at which the motor is at to achieve a foward motion of 120mph with the plane. SAY 3,000rpm
so for the plane to go 120mph the motor needs to be at 3000rpm.
now put the plane on the tread mill, but turned off and not moving.
increase both the speed of the treadmill and the speed of the plane(RPM OF THE MOTOR) untill the plane reaches 3000rpm and the treadmill reaches 120mph.
the plane stays in the same spot of the tread mill, neither falling off the back, or getting any postive speed because it is allready at 3000 rpm which only puts the plane at 125mph. 120 -> and 120 <- = ZERO
the plane’s rpm would have to be higher than 3000 inorder to reach positive motion.
so higher than 3000rpm = more than 120mph = faster than the tread mill = lift.
the wind generated from the engines on a treadmill is not enough going over the wings to achieve list.
the plan will not take off.
AAAAARRRRRGGGGGH!!! In this theoretical experiment the treadmill speed is totally independent of airplane speed!!! The assumed frictionless wheels do not transfer any force to the airplane from the treadmill!
:Aneurism:
and thus i been trying to say all along mister choda but i get negative reponsed towards not only me but my job and the company i work for because some people to not like to be proven wrong.
omg… close this damn thread
this thread gets:
heres a question for you …
assuming zero wind speed, and all the room you need in all directions what is the most effective direction to point your plane in order to take off ?
north south east or west ?
by the way, assume that your at the equator … and remember, the earth is spinning at all times
Wetwork, where did you get your engineering degree? What discipline was it? I’m not hinting at anything, there’s no hidden meaning, I just really want to know.
yeah… buuuuut, the tricky part is that the plane can be going 200 mph, while the wheels are going 400 mph (due to the treadmill going backwords @ 200 mph) and that is why it would take off.
honestly though… the wheels, I dont think, would endure too much of that for very long so who knows… it might not actually work in the real world… but in theory it’ll work.
SOMEONE CALL MYTHBUSTERS
It’s OT, STFU, bitch… :biglaugh:
and at the same time what is your job discription at boeing.
and the overall speed of the plain can never be zero, since the plain speed is relative to the air, the treadmill speed is relative to the plain and the wheel speed is the combination of plain speed and treadmill speed, i just relized that I have been speeling the wrong “plane” throug my last post but I am way too lazy to go back and fix it. Sine the treadmill and the plane is completely independent as ther is no non force transmitting members between the two, the treadmill speed can never match that of the airplane speed relative to the treadmill its self, basically a spec of the treadmill will perceive the plane to be going at 200mph if the plane is traveling at 100mph relative to the aire, yet it will keep increasing.
It all boils down to the fact that in this experiment, the treadmill speed has absolutely no effect on anything except wheel speed. It does not affect airplane speed, it does not affect airflow over the wings, it does nothing.
Some people cannot grasp this concept, which is fine for the general public. Things like frictionless surfaces are totally counterintuitive to every day life experience. It just boggles my mind that a supposed degreed (?) design engineer at an aircraft company cannot grasp this concept and remains arrogant while defending his incorrect position.
Einstein said that “The most difficult problems we face cannot be solved with the same level of thinking we were at when we created them.” Wetwork, you need to move to a different level of thinking regarding this problem. Take a step back and re-evaluate. Keep it as simple as possible. Get rid of friction at the interface between the plane and the treadmill.
Note to self…
Don’t ever fly on a Boeing plane.
thank you thank you thank you!!!
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