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Originally Posted by David603
Replace gun wing and engine with just engine and you have the exact way the IX came into life.
The original Spitfire MkI was replaced by the very similar but slightly more powerful Spitfire MkII, and this was supposed to be replaced with the more refined and more powerful MkIII. The need for rapid improvement to match the threat posed by the Bf109F saw the MkIII's engine being put in a MkII airframe to produce the MkV instead (MkIV was the prototype Griffon Spitfire). The MkVI was a high altitude MkV, and the MkVII was another high altitude Spitfire, but incorporating the improvements meant for the MkIII and a two stage Merlin engine. The MkVIII was a low-medium level version of the MkVII, minus the pressurised cockpit and the extended wingtips. Like the MkIII, it was overtaken by the need for a big leap in performance to match the Fw190, so the another unplanned version came about, the MkIX, which was produced by sticking the two stage Merlin in a Spitfire MkV airframe. Luckily the MkIX proved a very good performer, but even so the MkVIII replaced it on the production lines eventually.
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So, it sounds like the Spitfire was always being improved in response to the German improvements. Were there any versions that made the Germans respond to the spit?