CorsAsh
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Registered: 19th Apr 02
Location: Munich
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That's not actually quoted, just came to mind. If the plane was stopped from moving backwards and airflow at sufficient speed passed over its wings, they'd still generate sufficient lift to get it off the ground wouldn't they?
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CorsAsh
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Registered: 19th Apr 02
Location: Munich
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quote:
Originally posted by UGH
could a helicopter take off if it were in the middle of a tornado that was spining in the opposite rotation to that of the helicopters blades and at the same speed?
No because the people inside would be dead.
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John
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Registered: 30th Jun 03
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People who still don't get this need shot.
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Ian
Site Administrator
Registered: 28th Aug 99
Location: Liverpool
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Yes. The frame of reference doesn't matter, the air just needs to pass the wing.
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Cosmo
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Registered: 29th Mar 01
Location: Im the real one!
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quote:
Originally posted by CorsAsh
That's not actually quoted, just came to mind. If the plane was stopped from moving backwards and airflow at sufficient speed passed over its wings, they'd still generate sufficient lift to get it off the ground wouldn't they?
In theory.
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DaveyLC
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Registered: 8th Oct 08
Location: Berkshire
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As soon as the engine(S) were started it would start moving, it would eventually reach a speed faster than the belt and then continue to accelerate (with the wheels rotating freely on the belt) its not like a car on a conveyor belt that would have to match the belts speed through its wheels to accelerate.
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Mike GSi
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Registered: 3rd Jan 07
Location: Ipswich, Suffolk Drives:Astra VXR
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My quote was purely to back up the fact that thrust is not needed to make an object fly!
how about this scenario:
A plane was tied to something strong enough to keep it in place, by its nose. The plane was facing north and needed 100mph of air/wind to create its lift and a wind of over 100mph blowing southerly was occuring, would the plane not leave the ground?
A plane can take off on a conveyor belt if the plane created sufficiant amount momentum. i.e if it needs 100mph on a runway it would need to create 100mph on the conveyer belt. simples!
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John
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Registered: 30th Jun 03
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No, it requries exactly the same amount of momentum as on a static runway, bar friction in the wheel bearings, which is negligible.
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Ian
Site Administrator
Registered: 28th Aug 99
Location: Liverpool
User status: Online
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I'm clear and I don't know why you need random examples which are nothing to do with the problem in order to make points which don't pertain to the original question.
Q. Would a plane take off if it were on a conveyor belt.
A. Not if it were tied to a church.
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Ian
Site Administrator
Registered: 28th Aug 99
Location: Liverpool
User status: Online
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quote:
Originally posted by John
No, it requries exactly the same amount of momentum as on a static runway, bar friction in the wheel bearings, which is negligible.
Amen.
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UGH
Banned
Registered: 28th Oct 09
User status: Offline
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quote:
Originally posted by Mike GSi
My quote was purely to back up the fact that thrust is not needed to make an object fly!
how about this scenario:
A plane was tied to something strong enough to keep it in place, by its nose. The plane was facing north and needed 100mph of air/wind to create its lift and a wind of over 100mph blowing southerly was occuring, would the plane not leave the ground?
A plane can take off on a conveyor belt if the plane created sufficiant amount momentum. i.e if it needs 100mph on a runway it would need to create 100mph on the conveyer belt. simples!
yeah if the wind is 100mph and the plane needs to reach 100mph to take off, then the windspeed is still 100mph so it would make the plane take off but standstill at the same time, the conveyour belt could be spinning in any direction at any speed i recokn
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Cosmo
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Registered: 29th Mar 01
Location: Im the real one!
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quote:
Originally posted by Ian
I'm clear and I don't know why you need random examples which are nothing to do with the problem in order to make points which don't pertain to the original question.
Q. Would a plane take off if it were on a conveyor belt.
A. Not if it were tied to a church.
What about a small cottage?
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DizzyRebel
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Registered: 2nd Jan 09
Location: Lincoln
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quote:
Originally posted by Cosmo
quote:
Originally posted by Ian
I'm clear and I don't know why you need random examples which are nothing to do with the problem in order to make points which don't pertain to the original question.
Q. Would a plane take off if it were on a conveyor belt.
A. Not if it were tied to a church.
What about a small cottage?
If the engines were powerful enough to drag it with it then who knows 
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Jamescorsa97
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Registered: 19th Aug 04
Location: Middlesbrough Drives: Cliosport 182
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quote:
Originally posted by Joe
Oh no, not again
my plan worked perfectly!!!
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Ste
Premium Member
Registered: 5th Mar 03
Location: Taif, Saudi Arabia
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VSTOL. NUFF SED.
I would rather lose by a mile because i built my own car, than win by an inch because someone else built it for me.
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J da Silva
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Registered: 10th Apr 03
Location: The FACTory
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I fucking loved this thread, I originally said in my comments that the plane wouldn't take off, as I didn't fully understand the question, I thought exactly what mattk just said on page 1 of this thread, then once it clicked I believed it would take off.
Epic none the less. 
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Cosmo
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Registered: 29th Mar 01
Location: Im the real one!
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you want to dig out one of the past 30+ pager threads on this very subject then
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J da Silva
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Registered: 10th Apr 03
Location: The FACTory
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Re-read my comment very carefully there Cosmo, I was talking about the original one.
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Cosmo
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Registered: 29th Mar 01
Location: Im the real one!
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Pfft.
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J da Silva
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Registered: 10th Apr 03
Location: The FACTory
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Manc piece of shit, or should I say Salford scum?
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Ste
Premium Member
Registered: 5th Mar 03
Location: Taif, Saudi Arabia
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I would rather lose by a mile because i built my own car, than win by an inch because someone else built it for me.
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X16joeXE
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Registered: 26th Jul 09
Location: Tarvin, Cheshire
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Ive read it all and decided it can only take off if the thrust can propell the plane forward faster than the convayor belt is going. If the plane is thrusting at 50mph and the convayor is spinning at 50mph then it wont. Too many different scenarios in this theory.
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LukeS
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Registered: 25th Nov 07
Location: Ormskirk
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It can take off yes, it's because it's not the wheels which make the plane take off it's the propellor http://www.youtube.com/watch?v=0KsdMuhYJPw
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Root
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Registered: 28th Dec 08
User status: Offline
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I think it will. If the belt was large enough for a plane..lol
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Cosmo
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Registered: 29th Mar 01
Location: Im the real one!
User status: Offline
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quote:
Originally posted by X16joeXE
Ive read it all and decided it can only take off if the thrust can propell the plane forward faster than the convayor belt is going. If the plane is thrusting at 50mph and the convayor is spinning at 50mph then it wont. Too many different scenarios in this theory.
Wrong.
The wheel freewheel under the plane, they arent driven like on a car. So the conveyor belt could be running at 200mph, but as long as the plane thrusts enough to create the forward movement and therefore the required airflow over/under the wings then it will take off.
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