Will the plane fly?
Senior User
Joined: May 2006
Posts: 150
Likes: 0
From: Virginia Beach
Originally Posted by Gunner15a
Thrust + Lift must be greater than Weight + Drag. The conveyer basicly reduces thrust to zero.........therefore no lift.
Gunner15a
Gunner15a
Dan
Logistics Pro
Joined: Nov 2004
Posts: 3,550
Likes: 5
From: Lancaster County PA
Nope.
Air must move over the wings to lower the air pressure over the top of the wing relative to the ambient air pressure under the wing.
If you parked this airplane and put several gigantic fans in front of it (and no, the propellers are not fans that provide lift, they only provide forward motion to create the uniform airflow over the wings) then the plane could lift vertically without moving forward (think "kite")
Edit:
(Dopeslap to own forehead)
Got me. Easy to overlook the fact that the props or jets push the plane forward through the air. Most of us tied to the ground immediately think in terms of wheels turning to move a vehicle forward.
Good one!
Fool me once, your fault. Twice, my fault.
Air must move over the wings to lower the air pressure over the top of the wing relative to the ambient air pressure under the wing.
If you parked this airplane and put several gigantic fans in front of it (and no, the propellers are not fans that provide lift, they only provide forward motion to create the uniform airflow over the wings) then the plane could lift vertically without moving forward (think "kite")
Edit:
(Dopeslap to own forehead)
Got me. Easy to overlook the fact that the props or jets push the plane forward through the air. Most of us tied to the ground immediately think in terms of wheels turning to move a vehicle forward.
Good one!
Fool me once, your fault. Twice, my fault.
Last edited by ckal704; Jan 4, 2007 at 08:17 PM.
Post Fiend
Joined: Mar 2002
Posts: 19,402
Likes: 38
From: Bonita Springs FL
Originally Posted by ckal704
Nope.
Air must move over the wings to lower the air pressure over the top of the wing relative to the ambient air pressure under the wing.
If you parked this airplane and put several gigantic fans in front of it (and no, the propellers are not fans that provide lift, they only provide forward motion to create the uniform airflow over the wings) then the plane could lift vertically without moving forward (think "kite")
Air must move over the wings to lower the air pressure over the top of the wing relative to the ambient air pressure under the wing.
If you parked this airplane and put several gigantic fans in front of it (and no, the propellers are not fans that provide lift, they only provide forward motion to create the uniform airflow over the wings) then the plane could lift vertically without moving forward (think "kite")
Post Fiend
Joined: Mar 2002
Posts: 19,402
Likes: 38
From: Bonita Springs FL
Hey neighbor, there are people who, no matter what you tell them, won't believe it - just wait and see
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Senior User
Joined: Sep 2004
Posts: 309
Likes: 1
From: Livermore,CA.
Every action has an equal and opposite reaction...
I GUARANTEE when you spool up those turbines...That plane is going to go somewhere....
There,maybe that will help..
Chris..
I GUARANTEE when you spool up those turbines...That plane is going to go somewhere....
There,maybe that will help..
Chris..
Last edited by F3504ME; Jan 4, 2007 at 08:32 PM.
Posting Guru
Joined: Sep 2003
Posts: 2,231
Likes: 0
From: Valley of the Sun AZ
Hey Andy
You might want to explain how a rocket works as it could be the same anaolgy.
Thrust will overcome all...
The plane will never leave the ground unless they push it away from the gate, filled with Jet A, Has peanuts (unless someone is allergic and then it is pretzels), the blue stuff in the toilet, the soda is put on, the pilot turns on the engines or the ATC clears it for take-off.
You might want to explain how a rocket works as it could be the same anaolgy.
Thrust will overcome all...
The plane will never leave the ground unless they push it away from the gate, filled with Jet A, Has peanuts (unless someone is allergic and then it is pretzels), the blue stuff in the toilet, the soda is put on, the pilot turns on the engines or the ATC clears it for take-off.
Last edited by Aztrainer; Jan 4, 2007 at 08:35 PM.
Laughing Gas
Joined: Dec 2003
Posts: 796
Likes: 1
From: KCMO
Ooh, ooh again! I just thunk of another one. Suppose the conveyor were turned off long enough for the plane to become airborne, and maybe even reach some comfortable cruising altitude - if the conveyor were then turned back on, would the plane fall down, or just stop and float in place?
Lead Driver
Joined: Jun 2005
Posts: 8,475
Likes: 728
From: Calgary Canada
I turn my back on FTE for a few hours and this topic is now FOUR pages? c'mon guys!
Of course, I was one of the people who just didn't get it and claimed the plane would just "run" along the treadmill while staying in place. I now very clearly see the error of my ways and I'm going to spend several years in a monastary to do my penance. Maybe.
Nice one!
Of course, I was one of the people who just didn't get it and claimed the plane would just "run" along the treadmill while staying in place. I now very clearly see the error of my ways and I'm going to spend several years in a monastary to do my penance. Maybe.
Originally Posted by pchristman
Ooh, ooh again! I just thunk of another one. Suppose the conveyor were turned off long enough for the plane to become airborne, and maybe even reach some comfortable cruising altitude - if the conveyor were then turned back on, would the plane fall down, or just stop and float in place?
Post Fiend
Joined: Feb 2000
Posts: 11,496
Likes: 6
From: Kansas
I get it -the plane flies!
Now, answer this: if a 1000 geese are sitting in your 747 while it's cruising at 30,000 ft. And they all get airborne in the plane at the same time. Do the wings of the plane still carry their weight?
Now, answer this: if a 1000 geese are sitting in your 747 while it's cruising at 30,000 ft. And they all get airborne in the plane at the same time. Do the wings of the plane still carry their weight?
Elder User
Joined: May 2006
Posts: 586
Likes: 1
From: Billings Mo
Originally Posted by ckal704
Edit:
(Dopeslap to own forehead)
Got me. Easy to overlook the fact that the props or jets push the plane forward through the air. Most of us tied to the ground immediately think in terms of wheels turning to move a vehicle forward.
Good one!
Fool me once, your fault. Twice, my fault.
Gunner15a