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The LF IX had nothing to do with Coningham or the LF V. It was in fact the standard production version of the IX comprising 70% of total production. It was originally called the IXB and only became known as the LF IX after the introduction of the HF IX In late 1943. Shortly after the IX was introduced in 1942 Rolls Royce had developed a much improved supercharger (I described the improvements in a previous post on the Packard Merlin). Testing of the FW190 vs the original IX showed the 190 was evenly matched with the IX at 21,000 feet and lower but was way behind above that altitude. The new supercharger increased the high altitude performance even further which was pointless. The decision was made to lower the supercharger gear ratios to vastly improve the low altitude performance while keeping the high altitude performance nearly to the same level as the original IX. Thus the Merlin 66 was born. The LF IXs performance at 30,000 feet was a match for the majority of WWII fighters In fact the USSR used their LFIXs (they received over a 1000) as their standard high altitude interceptor until 1949. In 1944 Rolls Royce produced a version of 66 with the original gear ratios called the Merlin 70 which powered the HF IX. onl 400 HF IXs were produced.There's extensive writing about the LF.IX variants in Morgan and Shacklady's Spitfire bible, which goes into how an attack went, which I'd like to add, but don't have time as I'm about to go out, nonetheless, the LF.IX came about after Coningham in North Africa requested LF.V Spitfires as in his words 80 percent of operations were conducted at low altitude, therefore Supermarine believed that the Vs should be converted to IXs and thus trials were carried out at Boscombe with MJ823. There is more in the book about those specific trials as well as a couple of recollections of the 'Bombfires' in action from guys who flew them.
The LF IX had nothing to do with Coningham or the LF V. It was in fact the standard production version of the IX comprising 70% of total production.
The point I am making is that the LF IX was not a specialized low level fighter . It was the RAF standard all purpose fighter from 1943 on.You might have missed the point. I'm not suggesting he was responsible for the LF.IX's development, but Coningham instigated the use of Spitfires at low-level. The IX, which, you'll recall from Price's book was intended as an interim only, which was by putting 60 Series Merlins into Mk.V airframes until production of the Mk.VIII was standardised as the next major Spitfire variant. That it didn't happen that way was simply due to expediency and the use of Mk.V airframes on the production line. As the V was simply a II with a Merlin 45, so the IX was a V with a 60 Series Merlin and the XIV was a Mk.VIII with a 60 Series Griffon. But back to the low-level Mk.IXs, of course, Coningham had something to do with them as he was C-in-C of the 2nd Tactical Air Force which operated the type and prior to it, he had instigated the Mk.V low level fighter with a cropped supercharger.
It mentions rockets, maybe they are including air launched V1s which were and are frequently called rockets. The last V1 to fall on UK was on 29 March 1945 in Suffolk.I am puzzled by the comments about daylight firing of V-weapons being more accurate. The internal guidance system for these weapons was set on the ground, and I see no reason for the accuracy varying whatever the time of day (or night).
The point I am making is that the LF IX was not a specialized low level fighter . It was the RAF standard all purpose fighter from 1943 on.
I don't have the exact date the LF V first appeared, but it seems the Merlin 66 was already in existence at that time.
From the early days of the high altitude Wellington a turbo charger was discounted because of the issues of fitting it into a Spitfire.The 60 series Merlin was originally built for fitting to the high altitude pressurised variant of the Wellington Bomber, the Mk. VI and as legend has it, it was Ernest Hives of RR who asked if one could be fitted to a Spitfire.
The first 60 series Merlin was fitted to a Spitfire, the Mk.III prototype in March 1941, with the first Mk.V converted with clipped wings for the low altitude role in the Middle East, as per Coningham's request was in May 1941.
611 Squadron converted to LF.IX in March 1943. Rolls-Royce was installing Merlin 66 in Spitfire V airframes around that time frame. See also Al Deere's book.There are no LF.IX in the 21 May report, so no indication when they arrived, there were simply 146 mark IX. Supermarine built a batch of 40 LF.IX February to June 1943, Castle Bromwich built 1 in April, 1 in June then 153 in August, production continuing until August 1945, the last F.IX was built in October 1943.
They hope to convert to LF.IX, but from that source we don't know this611 Squadron converted to LF.IX in March 1943. Rolls-Royce was installing Merlin 66 in Spitfire V airframes around that time frame. See also Al Deere's book.
They hope to convert to LF.IX, but from that source we don't know this
From the early days of the high altitude Wellington a turbo charger was discounted because of the issues of fitting it into a Spitfire.
No it wasn't. It replaced the F IX in production. In fact it was virtually the only model produced from mid 1943 to to the end of the war. As Alfred Price states, it was not known as the LF IX until the HF IX appeared in 1944. As I never tire of pointing out the LF IX was nearly as fast at altitude as the F IX. The were equal at 26,000 feet with the F IX gaining an advantage of 15 mph at 28,000 feet and above . The LF IX was 30 mph faster at 23,000 feet, they meet again at 16,000 feet with the LF IX again being about 30 mph faster at 10,000 and below.Actually, you're slightly wrong about that, because the LF.IX was the low altitude variant of the F.IX, which was yada yada... the LF prefix indicating its low altitude chops, which I used in my previous post.
The first MK Vs appeared in the desert in May 1942, was Coningham clairvoyant? In any case clipped do not make an LF V, a cropped supercharger does.The 60 series Merlin was originally built for fitting to the high altitude pressurised variant of the Wellington Bomber, the Mk. VI and as legend has it, it was Ernest Hives of RR who asked if one could be fitted to a Spitfire.
The first 60 series Merlin was fitted to a Spitfire, the Mk.III prototype in March 1941, with the first Mk.V converted with clipped wings for the low altitude role in the Middle East, as per Coningham's request was in May 1941.
As Alfred Price states, it was not known as the LF IX until the HF IX appeared in 1944.
Surprisingly he does not finish the sentence with yada, yada ,yada...
The first MK Vs appeared in the desert in May 1942, was Coningham clairvoyant? In any case clipped do not make an LF V, a cropped supercharger does.