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The Mustang IA, s/n. FD449 at the Air Services Training Ltd, Hamble, Hampshire (UK), 1942.


the source: File:Mustang IA recon plane at Hamble c1942.jpg - Wikimedia Commons
 
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The RAF improved NAA designs for gun mounts (Mustang I 50 cal and IA 20mm), belt feed and spent cartridge chutes - wich led to better installations on the P-51-NA and Subsequent Mustangs for AAF. They also politely declined the Hispano II 20mm and recoil buffering system for their superior installations.

The P-51-NA (later -1 and -2 for camera equipped recon capability) was the last Mustang to use the Oldmobile mfr Hispano II, although the P-51F had it been accepted for production would have mounted 4x20mm as a longer range 'point interceptor
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Not questioning this, but is there a source for this for the P-51F/G (the ones that flew with armament had 4 .50s)? I did read on Secret Projects site that the P-51H was hoped by the USAAF to mount 4 20mm cannons, but the USAAF waffled about too long deciding between 6 .50s, 4 or 6 .60s, or 4 20mm and North American made the decision on 6 .50s for them.

Also, any idea on ammo capacity, given that the 4 .50s had 440 rpg?
 
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As memo serves .... the Missouri Air National Guard
 
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The AAF/USAF stayed out of the 20mm game after P-38 and P-61 (P-51-NA doesn't count as they were built to RAF armament specs as Mustang I). They strong armed NAA into delivering sub assemblies for P-51D 'normal' armament rather than 2x20mm plus 2x50 cal as specified by Australia fr NA-110 project. In November 1943, they closed the door on producing the P-51F as it could not install a fuselage fuel tank so the idea of the 20mm armament went away.

Multiple 20mm plus 37mm armament configurations were proposed by NAA for A-36 but AAF ordered 50 caliber as standard armament. Ditto for P-51A

The P51H was never envisioned with 20mm cannon. NAA finally got the 20s back in airframes with the FJ-2 Fury, then the GUNVAL F-86E/F modification and the F-100.

Ammo capacity for the proposed P-51F was 125 20mm belt fed rpg per gun. P-51-NA had 100rpg.

XP-51F and G and J had 4x50 cal, 250rpg. P-51H had 390 inboard, 260 each for middle and outboard. 10rpg less than P-51D/K for each station.

The P-51A/B had 350 rpg inboard plus 280 outboard for each wing
 
This is XP-51B #2 after returning from Ames windtunnel, where the lower scoop inlet geometry was modified to improve Boundary Layer flow characteristics. Still at Inglewood so this is May 1943 circa photo - about the time the first Production P-51B-1-NA flew, after waiting six weeks for Packad to deliver engines.


This is the famous Mustang that has been shown head on in Ames windtunnel, outer wing section removed and with 20mm guns removed. Horkey sat in the seat at 500mph while the angle of attack was varied so the he could experience the loud rumble reported by Chilton during January 1943 test flights..
 
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Too many aces, too few F-86 slots. Nobody wanted to mix it up with Migs in F-80 or F-84. Robin Olds as well as my father tried. Dad got Korea but they dropped the F, replaced it with B, dropped the 8 and replaced it with 2. That said he loved the B-26s - both Martin and Douglas.
John Voll's P-51D-15-NA American Beauty.
 
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Actually the 67th TRG P-51A and P-51-2-NA were available in Late October 1942 to familiarize the 354th FG pilots transition from P-39 to P-51B.
 
Resp:
Taken from British order of Mustang MkIA and redesignated by USAAF initially as P-51-1 (and -2). But before assigned to an operational unit . . . were fitted with cameras and redesignated as F-6A Mustangs for photo recon.
Actually designated P-51-NA. Then AAFasked NAA to modify as recon ship, which they did and that particular P-51-NA was designated P-51-1-NA. Subsequently there remaining camera modswere executed at Depot and releaed as P-51-2-NA. In 1944 he designations transitioned to "F-6" and Subsequently F-6A, then B for P-51A and C for P-51B/C and D for P-51/K.
 
This ship FT-T is 353rf FS/354th FG at Deenethorp Field F-128 on December 27th 1943. Visiting 401st BG to show off the new fighter. It transferred to 555FTS/496 FTG at Boxted, circa September 1944. Pretty famous PRO shot.
 
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