PDA

View Full Version : P-51D Wing Root Fillets: Aerodynamics or....



tomtheyak
09-29-2008, 05:10 PM
Always bothered me but could never find an answer so thought I'd throw it at the zoo frenzy.

The wing root extension on the leading edge of the P-51D is far more pronounced than on any earlier marks; why? Was there an aerodynamic characteristic being taken advantage of? Or was it structural, or even something as mundane as making space for a slightly larger wheel/tyre diameter.

Could someone enlighten me?

ImMoreBetter
09-29-2008, 05:20 PM
It had to do with a different gear retraction system. IIRC.

luftluuver
09-29-2008, 05:22 PM
Larger main wheels/tires were fitted on the D.

This, I believe, is where the myth the D got a bigger wing from.

HayateAce
09-29-2008, 11:11 PM
It was done to make it even more sexi.

http://icanhascheezburger.files.wordpress.com/2008/02/funny-pictures-cat-punches-dog.jpg

Bremspropeller
09-30-2008, 10:38 AM
Yeah, for the a$$ lovers http://forums.ubi.com/images/smilies/59.gif

jarink
09-30-2008, 10:58 AM
Originally posted by luftluuver:
Larger main wheels/tires were fitted on the D.

No, but the opposite is true of why the wing root "extension" was smaller on the H.

ImMoreBetter is mostly correct. The gear door retention mechanism was completely redesigned on the D.
Here's a pic I made (from factory drawings) for a profile of the door on the B:
http://i24.photobucket.com/albums/c1/jarink/P-51BLandingGearDoor.jpg
Now compare it to this photo (I've got a drawing for the D, too, just not handy) of the gear door for the D:
http://www.ipmsstockholm.org/magazine/2005/12/images/walkaround_p51_d_038.jpg

Note that the actuator arm has moved from the front to the rear of the door and there is a large latching mechanism added to the lower rear corner.

Now compare the D photo to this photo of a famous B:
http://www.lincolnmodelclub.co.uk/68306942.jpg

Note how the position of the gear door really hasn't changed relative to the rest of the wing; only the root leading edge is farther forward. This was not because of larger wheels, but because lots of the mechanisms inside the wheel wells were repositioned to the front of the well, requiring more space.

I hope that clears thing up! http://forums.ubi.com/images/smilies/16x16_smiley-happy.gif

Aaron_GT
09-30-2008, 11:49 AM
Was this to solve the problem of the doors opening in flight?

JSG72
09-30-2008, 02:42 PM
It was to correct a CofG problem http://forums.ubi.com/images/smilies/icon_twisted.gif

buzzsaw1939
10-01-2008, 06:49 AM
because they made the rear tank too big! http://forums.ubi.com/images/smilies/16x16_smiley-very-happy.gif

rnzoli
10-01-2008, 09:37 AM
it was a primitive step towards swept wings
http://forums.ubi.com/images/smilies/shady.gif

M_Gunz
10-01-2008, 10:53 AM
Proof that the US knew all about swept wings before end of war!
P-51 data was the real source of Sabre design!

tomtheyak
10-01-2008, 11:14 AM
@ Jarink: thanks for that old fruit! Nicely and thoroughly explained; the question had been niggling me for years!

R_Target
10-01-2008, 04:17 PM
So they could fit more whup-@ss inside.

BillyTheKid_22
10-01-2008, 05:47 PM
Originally posted by HayateAce:
It was done to make it even more sexi.

http://icanhascheezburger.files.wordpress.com/2008/02/funny-pictures-cat-punches-dog.jpg



http://forums.ubi.com/images/smilies/16x16_smiley-very-happy.gif I am laugh!!



http://www.naws.biz/PicOK.jpg

HayateAce
10-02-2008, 08:19 AM
http://forums.ubi.com/images/smilies/59.gif

Billy,

Nice Oklahoma Kid!

http://forums.ubi.com/groupee_common/emoticons/icon_cool.gif

http://www.naws.biz/74FS23FGP51_OklahomaKid.jpg