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Why don't all fighters have low Wing Loading?



 
 
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  #1  
Old September 21st 03, 03:24 AM
Chad Irby
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Default Why don't all fighters have low Wing Loading?

Hobo wrote:

If low wing loading is so important to a fighters maneaverability why
don't all fighters have big wings and thus low wing loading? What are
the drawbacks to big wings which make low wing loadings rare?


Aerodynamic drag.

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  #2  
Old September 21st 03, 03:32 PM
Chad Irby
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Hobo wrote:

Chad Irby wrote:

Aerodynamic drag.


So if the F-15 had high wing loading it would be a Mach 3 rocket?


Hard to tell. You *can* have planes with higher wing loading that have
a better turn radius (the WWII Messerschmitt 109). The aspect ratio of
the wing is very important here, too.

But if you keep everything else the same, you reduce drag (by some
amount) while also increasing the turn radius (by some amount).

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  #3  
Old September 21st 03, 07:04 PM
Alan Minyard
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On Sat, 20 Sep 2003 17:39:55 -0700, Hobo wrote:



If low wing loading is so important to a fighters maneaverability why
don't all fighters have big wings and thus low wing loading? What are
the drawbacks to big wings which make low wing loadings rare?

TIA


Increased drag, a lot of increased drag.

Al Minyard
  #4  
Old September 21st 03, 07:51 PM
Nele_VII
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Chad Irby wrote in message ...
Hobo wrote:

Chad Irby wrote:

Aerodynamic drag.


So if the F-15 had high wing loading it would be a Mach 3 rocket?


Hard to tell. You *can* have planes with higher wing loading that have
a better turn radius (the WWII Messerschmitt 109). The aspect ratio of
the wing is very important here, too.


Yes, but I've heard that Bf-109 was "bleeding" speed in turn much faster
than, f.e, Spitfire, so the Bf pilot had to "ease" on the stick. Something
like F-104 or MiG-21 behavior (although MiG-21 is loosing speed due to
dynamic drag of the delta-wing, not wing loading).

But if you keep everything else the same, you reduce drag (by some
amount) while also increasing the turn radius (by some amount).


Bf-109 had ot from both worlds, it seems.

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  #5  
Old September 22nd 03, 12:45 AM
Air Force Jayhawk
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On Sat, 20 Sep 2003 17:39:55 -0700, Hobo wrote:



If low wing loading is so important to a fighters maneaverability why
don't all fighters have big wings and thus low wing loading? What are
the drawbacks to big wings which make low wing loadings rare?

TIA


Also, high aspect wings generate huge bending moments under high G.
The weight of the necessary structure would kill any performance
gains.

Ross "Roscoe" Dillon
USAF Flight Tester
(B-2, F-16, F-15, F-5, T-37, T-38, C-5, QF-106)
  #6  
Old September 22nd 03, 06:44 AM
IBM
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"Nele_VII" wrote in
:

Chad Irby wrote in message ...
Hobo wrote:

Chad Irby wrote:

Aerodynamic drag.

So if the F-15 had high wing loading it would be a Mach 3 rocket?


Hard to tell. You *can* have planes with higher wing loading that
have a better turn radius (the WWII Messerschmitt 109). The aspect
ratio of the wing is very important here, too.


Of course the 109 had automatic leading edge devices to allow
for better performance at high AOA. Surprised no one has mentioned
this.
Basically speeds up airflow over the wing, re-energises the boundary
layer and delays the onset of separation. Gives a higher CL and
thereby tighter turns.

IBM

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  #7  
Old September 22nd 03, 10:52 PM
steve gallacci
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Hobo wrote:

If low wing loading is so important to a fighters maneaverability why
don't all fighters have big wings and thus low wing loading? What are
the drawbacks to big wings which make low wing loadings rare?

As many will observe, there is always a compromise between
drag/lift/speed. The best dogfighting wing plan/airfoil makes for a
lousy supersonic or economic cruise arrangement. There are ways to make
larger wings somewhat less draggy (swing wings/thin but very "flapped"
or variable airfoil wings) but even then there is absolute wetting area
drag which will still get you in those cases.
 




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