Mr. Kemer, belonging to the Van Berkel team made a two-stroke rotary radial engine, with 8 cylinders giving 120 hp.

-As a special feature is a disc-type piston that interposes to give way to the fresh mixture and then produces the exhaust to prevent both from mixing. In the cylinder head there is a long intake valve with long arrival tubes for the fresh mixture. It weighed 95 Kgs.