Today I have for the first time noticed in an old news real that the FW190 had what appears to be small fan blades mounted on the propeller shaft acting in the cooling intake gap between the spinner and the cowling. Having never seen or thought about that before, I ask the collective knowledge base here for opinions on that, it would cause an additional load on the engine, but may allow for a reduced intake/frontal area that may be able to result in a net gain…again I just noticed it today and haven’t had time to give it much thought, let alone run numbers, but curiosity forces me to ask…did it work as a plus or minus (provide ground cooling but decreased flight performance)?
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