Go Back  Airline Pilot Central Forums > Pilot Lounge > Hangar Talk
Hypothetical Question >

Hypothetical Question

Notices
Hangar Talk For non-aviation-related discussion and aviation threads that don't belong elsewhere

Hypothetical Question

Old 12-06-2005, 01:36 AM
  #11  
APC co-founder
 
HSLD's Avatar
 
Joined APC: Feb 2005
Position: B777
Posts: 5,853
Default

Thrust, Lift, Weight (Gravity), and Drag are the forces working on an aircraft.

The thrust isn't delivered through the wheels, so the belt won't increase drag (over the friction constant of the wheel bearings). Airspeed being independent of groundspeed:

I'll say "fly"

BTW, are we talking about an A380



Oh and by the way:

"Cold water does not boil faster than hot water. The rate of heating of a liquid depends on the magnitude of the temperature difference between the liquid and its surroundings (the flame on the stove, for instance). As a result, cold water will be absorbing heat faster while it is still cold; once it gets up to the temperature of hot water, the heating rate slows down and from there it takes just as long to bring it to a boil as the water that was hot to begin with. Because it takes cold water some time to reach the temperature of hot water, cold water clearly takes longer to boil than hot water does. There may be some psychological effect at play; cold water starts boiling sooner than one might expect because of the aforementioned greater heat absorption rate when water is colder.

Last edited by HSLD; 12-06-2005 at 01:42 AM.
HSLD is offline  
Old 12-06-2005, 03:38 AM
  #12  
On Reserve
 
Joined APC: Oct 2005
Position: CRJ FO
Posts: 24
Default

Who cares about drag and thrust in this example? For that matter, who cares about wheel bearings, conveyor thickness, and every other variable, again in this example? The fact is, is there is zero air flow over the wings so there is no way it can take off. If we are going to disregard this little fact, then I guess what your saying is is that I can pull a red wagon on the belt and if I pull it fast enough, it eventually it will take off?!?! I am starting to feel like the butt of the joke. Im hoping so becasue it would be scarey to think people actually think the airplane would take off. By the way, if we want to rewrite the riddle and add all the assumptions stated above, then I will gladly agree that the airplane will take off... if there is enough lift involved.
clearedtoland is offline  
Old 12-07-2005, 10:58 AM
  #13  
Da Man
Thread Starter
 
WatchThis!'s Avatar
 
Joined APC: Feb 2005
Position: DC-10 F/O
Posts: 436
Default

You'll overspeed the wheels, but it'll fly.
WatchThis! is offline  
Old 12-07-2005, 01:06 PM
  #14  
On Reserve
 
Joined APC: Oct 2005
Position: CRJ FO
Posts: 24
Default

After careful consideration, I would like to change my answer. My new answer is......There is no way to know if the airplane will take off because we do not have enough information in the original question to make a logical decision. I had to make certain assumptions to definitavely say the airplane would not fly, just as all the folks who said the airplane would fly, had to make certain assumptions. If the "it will fly" guys used my assumptions, they would say the airplane would not fly. And if I made the assumptions that the "it will fly" guys made, then I would say the airplane would fly. Therefore, I capitulate and retract my opinion that the airplane will not fly...BUT...I do not agree the airplane will fly, without getting more information.
clearedtoland is offline  
Old 12-07-2005, 01:34 PM
  #15  
Line Holder
 
Joined APC: Dec 2005
Posts: 72
Default

no relative wind=no fly, nuff said
Jonesthepilot is offline  
Old 12-07-2005, 03:34 PM
  #16  
APC co-founder
 
HSLD's Avatar
 
Joined APC: Feb 2005
Position: B777
Posts: 5,853
Default

Originally Posted by Jonesthepilot
no relative wind=no fly, nuff said

The thrust is acting on the surrounding air not through the wheels, the plane WILL move, the wheels will be spinning like of son-of-a-gun but it's going to fly.

I'm going to start asking this on interviews, you guys better find the answer
HSLD is offline  
Old 12-07-2005, 04:24 PM
  #17  
Line Holder
 
Joined APC: Jun 2005
Posts: 74
Default

It could only fly if it was eastbound on a westbound conveyor in the southern hemisphere. Obvious laws of physics here folks.
hifly is offline  
Old 12-07-2005, 04:27 PM
  #18  
APC co-founder
 
HSLD's Avatar
 
Joined APC: Feb 2005
Position: B777
Posts: 5,853
Default

Originally Posted by hifly
It could only fly if it was eastbound on a westbound conveyor in the southern hemisphere. Obvious laws of physics here folks.
Hmmm, good point
HSLD is offline  
Old 12-07-2005, 04:27 PM
  #19  
avbug
Guest
 
Posts: n/a
Default

Originally Posted by hifly
It could only fly if it was eastbound on a westbound conveyor in the southern hemisphere. Obvious laws of physics here folks.

Only on leap years, when El Nino is in effect.
 
Old 12-07-2005, 05:59 PM
  #20  
On Reserve
 
Joined APC: Oct 2005
Position: CRJ FO
Posts: 24
Default

If your answer is the airplane will fly, you are right...and if you say the airplane will not fly, you are correct also! This question is too vague to answer with any degree of certainty. Need more information.
clearedtoland is offline  
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
surreal1221
Pilot Health
32
11-14-2006 01:19 PM
MustangFa1con
Cargo
9
07-16-2006 07:26 PM
cargo hopeful
Cargo
21
03-05-2006 06:12 AM
Cjp21
Major
6
02-28-2006 06:44 PM
mike734
Hangar Talk
4
12-20-2005 03:29 PM

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On


Thread Tools
Search this Thread
Your Privacy Choices