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Do they? Hmm, the real spitfire's blades DO seem to be set to rotate counter-clockwise...
I would say that to make them turn the other way you'd have to grab a image editor and invert the order of the frames. But that might turn out pretty strange...
Funny, I made some models for the TGW mod and got the props rotating counter-clockwise. Then I noticed the sprites in the game rotate clockwise, and was considering inverting my models. Maybe I won't, then.