Will the plane take off?? Finally going to be answered.***

[93EXT 10+ year member]

okay, i realize that a treadmill going in the opposite direction would not help the plane slow down on landing, but essentially you can reduce the land area of the airport because the plane can act like it is landing on a 3,000 foot runway when it is only on less than 800 feet, gives more braking time while reducing the ground distance the plane has to travel.
for takeoff, if the plane needs and airspeed of 150 miles per hour, the plane can have thrust of 75 mph rolling on a 75mph forward conveyor, then hit its brakes and achieve the rest of the necessary velocity almost instantly, because the conveyor velocity would then add to the thrust from the plane? is that more correct? the plane would have to lock the wheels in place though to prevent rolling

soon as you lock the wheels( as long as you hold the brakes) you loose the planes 75 mph, and only have the conveyor moving the plane after that

 

[IamDeMan 5,000+ posts]

The answer is basic, it is just tricky to grasp for those who aren't fresh out of Physics (4 years is fresh in relation tama) or don't deal with this kind of thrust generation. For most people they use thing(even our own bodies) that generate thrust from pushing off the ground. Without getting this thought out of your head you will not see the problem clearly. I can now also understand why they are visiting this problem on mythbusters. To show people how to approach this problem.

I still say they will seriously botch it. I mean come one we're talking about a plane and a treadmill. What can't go worng?

 

[IamDeMan 5,000+ posts]

NG, maybe you can try to explain things like this rather than just call people idiots and look like a bigger idiot doing said idiot calling.//content.invisioncic.com/y282845/emoticons/eek.gif.771b7a90cf45cabdc554ff1121c21c4a.gif

NAH, I wouldn't want him that way. We have enough smarty pants willing to patiently explain stuff. He gives that spark that some people need to pay attention to those explaining it correctly //content.invisioncic.com/y282845/emoticons/wink.gif.608e3ea05f1a9f98611af0861652f8fb.gif
Not too mention he usually causes people to create entertaining drama ftw!

 

[mapolley07 10+ year member]

no, all that would do is just lower the friction gererated by the wheels. the only good way to shorten take-off distance is by taking off into the wind. thats why on a aircraft carrier, when they start doing takeoffs, why turn into the wind. more wind under the wings, more lift.

i know that taking off into the wind increases the amount of air hitting the wings, thus making takeoff easier.

what i was thinking was that if there were a way to have the conveyor add to the thrust of the airplane (eg lock the brakes of the plane so the wheels don't roll) then you could effectively double the forward velocity of the plane.

on landing the backward movement of the conveyor would just allow a plane to stop forward progress while braking. the more i think about this, though, the more i see how it would not be effective, and the plane would not stop.

 

[rollerdj 10+ year member]

haha... nope. becuz by hitting the brakes, all u do is stop ALL thrust being deliverd by the jet / prop. now your just doing 75 mph. picture going full power on a tarmac will the parking brake. thats all your doing when u slam on the brakes on a treadmill

 

[rollerdj 10+ year member]

I still say they will seriously botch it. I mean come one we're talking about a plane and a treadmill. What can't go worng?

i will almost bet they will. but it's still fun. plus the redhead (name is slipping my mind) is freakin hot. redheads FTW

 

[IamDeMan 5,000+ posts]

I have a really important question about this now.

Can I get my answer in the poll changed?

 

[mapolley07 10+ year member]

everything clicked now, i see how the conveyor has no effect whatsoever, on either takeoff or landing.

I have never taken physics, so my thinking was based on velocity problems from calculus, and without being familiar with solving velocity problems based on airspeed, it was difficult for me to switch from ground speed to airspeed. now that I understand how to look at the problem, i get it.

 

[mapolley07 10+ year member]

oh, and i want to change my poll answer now that i have seen the light also lol

 

[IamDeMan 5,000+ posts]

I also don't want to change to Yes it will takeoff. I want to change it to simply they will screw it up. I think they will screw it so bad that the plane indeed won't lift off making my original answer correct anyway lol.

 

[rollerdj 10+ year member]

everything clicked now, i see how the conveyor has no effect whatsoever, on either takeoff or landing.
I have never taken physics, so my thinking was based on velocity problems from calculus, and without being familiar with solving velocity problems based on airspeed, it was difficult for me to switch from ground speed to airspeed. now that I understand how to look at the problem, i get it.

//content.invisioncic.com/y282845/emoticons/clap.gif.178cba2c538c68e720c727fcb024b19c.gif:clap://content.invisioncic.com/y282845/emoticons/woot.gif.aaa6090e619a97b6090d16dd863c5a69.gif

 

[rollerdj 10+ year member]

I also don't want to change to Yes it will takeoff. I want to change it to simply they will screw it up. I think they will screw it so bad that the plane indeed won't lift off making my original answer correct anyway lol.

or the plane falls off this "treadmill" crashes, end of show.

 

[93EXT 10+ year member]

I still don't think it will work as IamDeMan said, a plane and a conveyor, what's not going to go wrong is a shorter list.

 

[rollerdj 10+ year member]

PS. i've never had any physics classes. just common knowlege.

 

[mapolley07 10+ year member]

by the way, thanks to everyone who helped me figure this out. I like to learn new things even if they are completely impractical and I will never use them. I don't think i will ever be trying to launch a plane from a conveyor, but now I know that physics will permit it!!! maybe next time i go out and buy myself a jumbojet i will buy a treadmill for it too, just to takeoff and show that it is possible