This is a strange engine concept, a radial type with each cylinder-piston attached to the crankshaft by gears parallel to it.

-It was designed by John Braumwalder and is on display as a prototype in Hangar number 1 at the Pima Air Museum.

“Rheem S-10” (PeT)

-In the photograph we see its modular construction. With its four cylinders it delivers 250 HP.

-The design is from 1938, and there is no more information of its result.