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Peter - I believe, but am not absolutely certain, that it was mainly done to prevent windage more than having a streamline effect. When you think about it those spokes would displace an awful lot of air once at full chat which would have made for some pretty airy conditions in sometimes quite compact engine rooms. That said there would also be the drag of those spokes so a degree of streamlining would be there anyway. Anyone else have thoughts on this?
Doing this from my old (and slow) laptop. The Windows 10 no choice but to do it, we're here to improve your PC etc 'new update' has totally and utterly buggered up my PC Regards for now - a very despondent Ol Tug