RE: Seidel 7-70 radial: Help me decide!
Let's have another look. As I said, I think the 7-cylinder actually looks a bit more "mock-scale" than the 9-cylinder. Maybe 18 rocker rods is a bit much. And I think the all "silver" cylinders of the newer Indian engines might actually be better suited to WWI models.
But really, the main reason is still to be able to use fly with a scale diameter prop. The Seidel 770 is designed for a 22" prop while a G26 turns a 16" prop.