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Thanks! Do you realize that the crankshaft is stationary and the cylinders are rotating?
Based on the Wikipedia information and animation on https://en.wikipedia.org/wiki/Rotary_engine#/media/File:Rotary_engine_-_animation_slower.gif the R-66 is a rotary engine I think. So I'm interested in how you would classify a radial or rotary engine, could you explain? Thanks!