Acceptances, 600 P-40K-1 (export version) April (1 only) to September (again 1 only) 1942, 700 P-40K August to December 1942, 600 P-40M November 1942 to February 1943. P-40N started in March 1943 with 5,219 accepted, of those 2,588 delivered in US for USAAF.
P-40F, USAAF 1,161 out of 1,311, rest to Britain, P-40L USAAF 600 out of 700, rest to Britain.
Deliveries in US
P-40K-1/K, 537 USAAF, 44 Australia, 30 Brazil, 339 Britain, 14 China, 22 New Zealand, 314 USSR
P-40M, 115 USAAF, 96 Australia, 10 Brazil, 94 Britain, 170 Britain for USSR, 15 Canada, 15 China, 35 New Zealand, 50 USSR
The Burma/India theatre was for both sides at the end of the longest/most difficult supply lines, putting severe restrictions on operations, add ideas about what could be done during the Monsoon. For the allies it was usually the last place to receive the latest aircraft or have its numerical requirements met. Until around mid 1944 for the IJA it, New Guinea and to an extent China, were the places to send the latest equipment, as long as it was mostly the IJN fighting in the Pacific.
The period is supposed to be late 1943/early 1944, the MTO managed its first Merlin P-51 mission in April 1944, so when did P-51B/C turn up in India and in what strength?
I don't know at what strength, but USAAF 23rd (in China) and 51st FG (China and India) apparently got some B and C model P-51s, and 311 FBG in India which went into combat in all three units apparently by May of 1944. One source I have says they were in Theater by Sept 1943 but there may have been a training period before they went into combat. I don't think any type of P-51s were in Theater in large numbers. The Sqn publication on the Mustang says that there were never more than 500 in the CBI and usually about 250 at any one time, and that includes both the Allison and Merling engined versions.
But the only Allied fighter types which seemed to be in really large numbers were the Hurricanes and later the P-47s / Thunderbolts.
The Allison engine variety arrived in August 1943, from the 55 P-51 and 260 P-51A plus diversions from the RAF order, delivered in the US for the USAAF. Next is the first USAAF P-47 turned up in India in March 1944, while there had been P-38 in theatre since July 1943, it took until 1945 to have more than 100 on strength. The RAF report their first P-47 arrivals in the May 1944 census, but they arrived a bit earlier, 2 reported in January 1944, then nothing until 134 in May.
The P-40 was all to around two thirds the USAAF CBI fighter strength until March 1944, P-40 numbers went to second behind the P-47 in June, third behind the P-47, P-51 in September when there were 204 P-40 in theatre, down to 50 in January 1945.
One of the peculiarities is the way India received few Spitfire V, almost going straight to mark VIII, no Spitfires end June 1943, 49 Vc end August, December it was 72 Vc to 64 VIII, end May 1944 there were 61 Vc and 408 VIII.
I would suggest that this was due to the rather severe range limitation of the Mk V, which was otherwise fairly good and certainly a major improvement over the Hurricanes which were in the breach far too long.
The Allison P-51 had 180 gallons of internal fuel plus a lower drag design than the P-40 which had a maximum internal fuel of 161 gallons, not surprising the P-51 could go further.
I haven't been able to find actual range statistics for the P-51A but this is helpful. Might have something to do with the external tanks too, P-51 carried two on the wings while the P-40 usually carried just the one on the centerline.
The USAAF surge in the CBI can be seen by the way no more than 1,700 combat hours flying per month by fighters to end September 1943, jumping to 9,800 hours in December and averaging around 11,800 hours a month in 1944.
This is a good illustration of the major ramp up which took place, which broke the JAAF in this period.
Shores has some helpful Order of Battle pages in the appendix. For
July 1, 1944 we see the following (just listing the Wings with the non- PR fighter Sqns and some dive bombers):
106 Wing with one Hurricane Sqn (60 Sqn), one Spitfire VIII (81 Sqn) and one Vengeance (84 Sqn)
170 Wing with four Hurricane IIc Sqn, one Spitfire VIII (607 Sqn) and one with both Spit V and Spit VIII (615 Sqn)
243 Wing with two Hurricane Sqns
165 Wing with one Hurricane IIc Sqn (91 IAF), and one Spitfire VIII (152 Sqn)
166 Wing with one Spitfire VIII Sqn (136 Sqn) and one P-38 (459th Sqn USAAF)
167 Wing with three Hurricane and one Vengeance Sqns
169 Wing with one Beaufighter X Sqn (211 Sqn)
80th FG (USAAF) with three Sqns P-40N
311 FBG (USAAF) with two Sqns P-51A and B/C and 1 A-36
293 Wing with two Spitfire VIII (67 and 155 Sqns) and 1 Beaufighter NF (176)
222 Group in Colombo with 2 Spitfire VIII, two Beaufighter Sqn, and 1 RAF Thunderbolt (135 Sqn), and a bunch of bombers and flying boats
225 Group in Bangalore with 1 Hurricane IIC and a bunch of bomber and flying boat Sqns
(in addition to this US groups like the 23rd and 51st FG were active in China and sometimes got involved in the fighting around India, 51st FG was sometimes flying out of India. By this point I think both groups were transitioning from P-40 to P-51)
For
12 Dec 1944 we now have some new units:
906 Wing with two Hurricane IIc Sqns
907 Wing with one Hurricane IIc and one Spit VIII Sqn
908 Wing with one Mosquito VI Sqn
909 Wing with three Spit VIII (17, 155, and 607 Sqns) and two Hurricane IIc Sqn
910 Wing with three RAF Thunderbolt Sqns (70, 146, 261 Sqn)
901 Wing with three Sqns of Beaufighter X
902 Wing with one Sqn Hurricane IIc, two with RAF Thunderbolt (30 and 155 Sqns) and one with P-38 (459 FS USAAF) Sqn
903 Wing with two Spit VIII (67 Sqn and 273 Sqn) and two Hurricane IIc (2 IAF and 4 IAF)
905 Wing with two Sqns of RAF Thunderbolts (134 and 258 Sqns)
80th FG (USAAF) with three Sqns P-47
33rd FG (USAAF) with three Sqns P-38 and one B-25
222 Group has 81 and 136 Sqn with Spit VIII and a bunch of bomber and flying boat Sqns
And there are several 'non operational units apparently transitioning. 8 IAF is getting Spitfire VIII
He doesn't list the 331 FBG group here but I believe they were still active..? Not sure. I think 23rd and 51st FG are still in the area as well.
So what is being defined as large numbers? USAAF transport operations in the CBI were split between the ATC controlled lift to China and the 10th and 14th Air Force operations either side of the mountains. While the ATC lift had some C-47 and was a major player in the higher altitude C-47B variant it used lots of C-46 given their altitude performance.
What I mean is that when they were engaged, which was not continuously, they typically lost a large percentage of the aircraft on the mission. More on that in a second.
The ATC thinks the airlift lost, all causes, 184 transports in 1944 and 169 in 1945, while making 153,839 east bound trips, or about twice that sorties. The histories state non combat losses were the majority, while Japanese fighters limited the routes that could be used, rather than inflicting continual losses. The ATC says it lost 703 aircraft, mostly transports around the world December 1942 to December 1945, all causes.
The theatre received its first C-46 in December 1944, it had up to around 50 C-47/53 for a time in mid 1942, down to zero by the end of the year, back to 35 in November 1943, and a new arrival, 7 light transports, then came the big movements, to 198 C-47/53 and 56 light transports in June 1944, to a transport fleet of 540 in December.
The USAAF Statistical Digest does not give transport aircraft losses, it does say the CBI lost 101 transport crews due to combat and accident June 1943 to August 1945.
So when were transport aircraft being shot down in "large numbers" and what percentage were due to Ki-43?
I'm referring to the pretty frequent appearances of the C-47s in Shores book, by later 1943 and into 1944 and later. The JAAF seemed to move in a few times of the year to disrupt regular transport flights over 'The Hump' and then on other occasions during the ground offensives on either side, near battlefields where troops or supplies were being brought in by the transport planes. These would only last for a week or two and usually seemed to inflict fairly serious damage. This also meant in both cases that Allied and JAAF units were moved up to airfrields closer to the front lines and they also attacked each others airfields. The Allies hit airfields where the JAAF fighters (almost exclusively Ki-43s) were based sometimes with fighter bombers, or with medium or heavy bombers, which sometimes worked, sometimes ended up in confusion and no damage, and sometimes in bloody air combats in which one side or both took fairly heavy losses (by which I mean 5-6 aircraft on a single sortie). During these periods the transport planes took heavy losses (again I'm thinking in terms of a handful lost out of a dozen or two flying), but this only happeend periodically, not continuously.
To be clear, I am not nor did I make any kind of categorial claim as to specific percentages etc., because I don't know or claim to know what those are. I was just describing the impression I got from reading the book.
If you think I'm making this up I can find and transcribe a few examples later tonight maybe. If you have the book you can find them yourself easily enough.