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 #26413  by dent
 
OK, I have seen this all over other forums and i figured i would bring it here.

This is the original question:

"Imagine a plane is sitting on a massive conveyor belt, as wide and as long as a runway. The conveyor belt is designed to exactly match the speed of the wheels, moving in the opposite direction. Can the plane take off?"

I'm interested to hear your thoughts :)

 #26419  by saunby
 
No, I just spent a couple of seconds thinking about that and everytime I tried to figure an explanation for yes there wasnt one.

Quite simply, the plane is basically at a standstill which means it cant take off, it needs to have the wind/air rushing underneath the wings to give it the lift so if there is none of that then its not going to take off.

Also it will never happen XD

 #26423  by Greed
 
This experiment is near impossible to creat but..... i dont think the plane will take off.

 #26427  by Darko
 
Obviously not.

Think about what makes the plane lift off. Aerodynamics.

Since the plane would not be moving at all, since the speed of the wheels and

the belt would cancel each other out. A plane needs to be moving at a fast

land speed for the wings to obtain the lift from the passing air to counter
act the weight of the plane.

But hahaha, its a trick question.

Wiki'd

VTOL is an acronym for Vertical Take-Off and Landing. VTOL describes fixed-wing aircraft that can lift off vertically. This classification includes only a very few aircraft; helicopters, autogyros; balloons and airships are not normally considered VTOL. Some aircraft can operate in VTOL mode in addition to others, such as CTOL (Conventional Take-off and Landing) and/or STOL (Short Take-Off and Landing). Others can only operate by VTOL, due to the aircraft lacking landing gear that can handle horizontal motion.

Currently there are two types of practical VTOL aircraft in military service:

* Using a tiltrotor — the Bell Boeing V-22 Osprey
* Using directed jet thrust — the Harrier Jump Jet family.

SO these jets do not need to be going at any speed to lift off.

:)

 #26429  by dent
 
Darky wrote: But hahaha, its a trick question.

Wiki'd

VTOL is an acronym for Vertical Take-Off and Landing. VTOL describes fixed-wing aircraft that can lift off vertically. This classification includes only a very few aircraft; helicopters, autogyros; balloons and airships are not normally considered VTOL. Some aircraft can operate in VTOL mode in addition to others, such as CTOL (Conventional Take-off and Landing) and/or STOL (Short Take-Off and Landing). Others can only operate by VTOL, due to the aircraft lacking landing gear that can handle horizontal motion.

Currently there are two types of practical VTOL aircraft in military service:

* Using a tiltrotor — the Bell Boeing V-22 Osprey
* Using directed jet thrust — the Harrier Jump Jet family.

SO these jets do not need to be going at any speed to lift off.

:)
this question only takes into account normal planes, so that wouldnt work :roll: lol

Like this one: (lol)
Image

 #26430  by Darko
 
Darky wrote:Obviously not.

Think about what makes the plane lift off. Aerodynamics.

Since the plane would not be moving at all, since the speed of the wheels and

the belt would cancel each other out. A plane needs to be moving at a fast

land speed for the wings to obtain the lift from the passing air to counter
act the weight of the plane.
The rest still applies

 #26432  by Raziel
 
Bah it will F***ing take off b.c i said so lol ^____^