IvIarkgraham
Premium Member
Registered: 27th Mar 04
Location: Ellesmere Port, Cheshire
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yes if it was one the way i said
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Dione J
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Registered: 22nd Sep 04
Location: West Midlands Drives: Leon Cupra Turbo
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LeeM
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Registered: 26th Sep 05
Location: Liverpool
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quote:
Originally posted by IvIarkgraham
quote:
Originally posted by Russ
quote:
Originally posted by IvIarkgraham
no i mean actual speed the plane is moving as it needs a certain speed to get the lift
ie if a plane needs to travel at 100mph to lift off but they conveyour belt is moving 50mph in the opposite diredction the plane would need to travel at 150mph to get the lift
no it doesnt.. it would need to travel 100mph...
actual speedof 100 mph but wheel speed of 150mph
 what the fuck do the wheels have to do with it? the wheels arent fucking powered! its the engines, the fucking bastarding engines move the fucking plane!!!!
people who argue it wont take off are thick as fuck imo
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Voyto
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Registered: 9th Feb 03
Location: Stafford
User status: Offline
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quote:
Originally posted by lee_wee
quote:
Originally posted by IvIarkgraham
quote:
Originally posted by Russ
quote:
Originally posted by IvIarkgraham
no i mean actual speed the plane is moving as it needs a certain speed to get the lift
ie if a plane needs to travel at 100mph to lift off but they conveyour belt is moving 50mph in the opposite diredction the plane would need to travel at 150mph to get the lift
no it doesnt.. it would need to travel 100mph...
actual speedof 100 mph but wheel speed of 150mph
what the fuck do the wheels have to do with it? the wheels arent fucking powered! its the engines, the fucking bastarding engines move the fucking plane!!!!
people who argue it wont take off are thick as fuck imo
Well said
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gianluigi
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Registered: 9th Mar 05
Location: Ipswich, Suffolk
User status: Offline
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the wheels are powered arent they? dont they put them in reverse to help bring the plane to a halt?
think i heard that in a film lol
correct me if im wrong
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LeeM
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Registered: 26th Sep 05
Location: Liverpool
User status: Offline
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quote:
Originally posted by gianluigi
the wheels are powered arent they? dont they put them in reverse to help bring the plane to a halt?
think i heard that in a film lol
correct me if im wrong
1)the size of the wheels
2)the size and weight of the plane
think man think...
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gianluigi
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Registered: 9th Mar 05
Location: Ipswich, Suffolk
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roflcopter 
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Scotty C
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Registered: 6th Nov 05
Location: Kidderminster Drives: 1.6 16v Sport
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How much does the avarage plane weigh? 747 for example.
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LeeM
Member
Registered: 26th Sep 05
Location: Liverpool
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155 tonnes there or there about
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Scotty_B
Member
Registered: 11th Jun 03
Location: East Kilbride
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quote:
Originally posted by lee_wee
155 tonnes there or there about
Similar to a Corsa D then.
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M2RTY
Member
Registered: 25th May 01
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right.......
a few people are thinking different things here
i would take it as:
speed of plane = speed of conveyor belt
so if you were stood on the ground next to the plane, the plane would appear stationary. the plane WOULD NOT take off as there is no air moving over the wings. Imagin running on a treadmill, your speed is the same as the tredmill so u stay the same. if you jump in the air you will land in the same possition
if:
speed of plane > speed of conveyor belt
the plane would need to move at the speed it would normally move at + the same amount the conveyor belt is moving at to take off
these are assuming that the conveyor belts are moving towards the plane
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Robin
Premium Member
Registered: 7th Jan 04
Location: Northants Drives: Clio 182 Cup
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If you run faster on the treadmill, you fall off the front.
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Hammer
Member
Registered: 11th Feb 04
User status: Offline
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The plane just takes off and that is it
I reckon this will become a chinese proverb like
'what noise does a tree falling in an empty forest make?'
'same as one with people in it'
'but how do you know if no one can hear it'
'AHHHHHHHHHHHHHHHHHHH'
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Dom H
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Registered: 14th Jun 06
User status: Offline
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If you swam in a pool which had a conveyor belt for the bottom, you will still move forwards. It's the same with the plane, the engines are moving the plane forward, not the wheels.
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Russ
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Registered: 14th Mar 04
Location: Armchair
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what if the life guard of the pool was a snake?
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Dom H
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Registered: 14th Jun 06
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Jamie
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Registered: 1st Apr 02
Location: Aberdeen
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What if it was a snake flying the plane in the pool?
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Russ
Member
Registered: 14th Mar 04
Location: Armchair
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or its a snakeskin conveyor belt
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Scotty_B
Member
Registered: 11th Jun 03
Location: East Kilbride
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quote:
Originally posted by Robin
If you run faster on the treadmill, you fall off the front.
Exactly, it would just need more thrust to compensate for the speed loss under the conveyor belt.
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M2RTY
Member
Registered: 25th May 01
User status: Offline
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quote:
Originally posted by Robin
If you run faster on the treadmill, you fall off the front.
then the speed of you > speed of treadmill
so the exact fraction of a second the plane leaves the treadmill it will be travelling at what?
1mph?
500mph?
if 1mph, what is keeping it in the air?
if 500mph, how did the plane go from being still (relitive to the ground) to going 500mph - it would not be capable of this change in speed
it WILL NOT fly if plane speed = belt speed
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Scotty C
Member
Registered: 6th Nov 05
Location: Kidderminster Drives: 1.6 16v Sport
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@ you lot
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M2RTY
Member
Registered: 25th May 01
User status: Offline
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its nothing to do with wheels or engine
the plan will be stood stationary
if there was a tree next to the plane the plane would ALWAYS remain the same distance from it
the thrust is cancelled out by the movement of the belt
the SAME thing applies when you run on a treadmill
the treadmill cancels out the thrust from your legs...you stay in the same position
the same would happen if a car, human, plane or dog was on the convery belt
it has nothing to do with if the power is comming from the wheels, engines, legs etc so long as it is moving in the opposite direction to the belt
basic physics
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Robin
Premium Member
Registered: 7th Jan 04
Location: Northants Drives: Clio 182 Cup
User status: Offline
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if the belt was travelling at the exact opposite speed to the speed of the plane with that amount of thrust on a normal runway, the plane would take off, as the friction in the wheel hubs would not slow the plane enough.
the belt would need to be travelling considerably faster than the plane would be on a normal runway.
a plane takes off at 150mph lets say, so the plane on a conveyor belt moving at 150mph in the opposite direction would still move, as the wheels are turning.
if the belt was travelling at enough speed to create the friction to slow the plane, you are right, it would not take off, but that speed would be greater than the take off speed of the plane.
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Scotty_B
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Registered: 11th Jun 03
Location: East Kilbride
User status: Offline
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quote:
Originally posted by M2RTY
the plan will be stood stationary
Not if the plane is moving faster than the belt.
If you are running on a treadmill it doesn't speed up when you do.
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M2RTY
Member
Registered: 25th May 01
User status: Offline
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or in a simple mathmatic equation
for arguments sake lets use 100mph as the speed which the plane leaves the belt
if plane = 100mph and belt = 0 then the plane will fly (the belt is not moving)
e.g 100 + 0 = 100
if plane = 100 and belt = -100 then the plane will remain stationary (the belt is moving the same speed as the plane in the opposite direction)
e.g 100 + -100 = 0
if plane = 100 and belt = -50 (i.e half the speed of the plane) then the plane will move at half the speed relitive to the ground but not take off as it does not have the 100mph speed it requires
100 + -50 = 50
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