Quote:
Originally Posted by 41Sqn_Banks
You are right about the performance, the difference is small. However the handling of Merlin III (Spitfire I) and Merlin XII (Spitfire II) is different.
E.g. Climb boost: Merlin III +6 1/4 vs. Merlin XII +9.
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a 1000m higher service ceiling is a pretty big difference imo.