Robo sure that Prop Unit have nothing to do with fuel octan. Even during Battle of France some Birtish Squadrons based in France used 100 Octan fuel in their Hurricanes.
I think we got a few variants of the same planes in Clod so why not to model them with different fuel octan performacne - 87 and 100 Octan. So early planes with 87 Octan fuel performacne like SPit MK1 with DH 2-stage prop and Hurricane with 2-stage prop and 100 Octan for Spit MK1 with constan speed prop the same like Huriccane with Rotol.
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