I tried Spitfire I (not IA) and Hurricane I (Rotol) and managed to get both to 20,000ft. I wasn't possible to get higher.
Climb limit (30min) for Merlin II and III: +6.25 Boost and 2600 RPM
Climb limit (30min) for Merlin XII: +9 Boost and 2850 RPM (however as the boost gauge is broken at the moment it's not possible to check this)
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