Here's part of the engine config from the I, Ia and IIa
Spitfire I
PHP Code:
Propulsion Engine Rolls-Royce MerlinIII Propellor deHavilland 5-20
Spitfire Ia
PHP Code:
Propulsion Engine Rolls-Royce MerlinIII Propellor Rotol RMS-7
Spitfire IIa
PHP Code:
Propulsion Engine Rolls-Royce MerlinXII Propellor Rotol RMS-7
Looks like it's got the Rotol to me. Whether it's working properly in game is another matter.