This is my SolidWorks model of the Olsryd 9 cylinder radial engine modelled after the original plans from Karl-Erik Olsryd (drawn by Jan Elg). You guys are probably already familiar with Jan's model which is very popular here on GrabCAD.

The Olsryd 9 cylinder is a quarter scale model of the Wright J-5 Whirlwind engine that powered Lindberg’s Spirit of St. Louis and the plans are available on www.olsryd.com in PDF format. It is an amazing engine; complete with oil tank, compressor-feeding, ignition distributor and gear box, numerous ball and roller bearings and a test stand.