Family. Can't live with 'em, can't live without 'em.
Pin size makes sense. What do you think of the Scuderi engine? The reason I think of it as a hybrid is that connection between the cylinders can be a compressed air tank. Which can be filled by the first cylinder or wind power ...or a Trombe:
Quote:
Trompe
A trompe is a water-powered air compressor, commonly used before the advent of the electric-powered compressor. A trompe is somewhat like an airlift pump working in reverse. Trompes were used to provide compressed air for bloomery furnaces in Catalonia and the USA. The presence of a trompe is a signature attribute of a Catalan forge, a type of bloomery furnace. Trompes can be enormous. Wikipedia
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