This 2-cycle rodless rotary engine, suitable for aircraft or autos, is a prototype built by Peter Grunstra. It’s a running 138-cubic inch prototype; however, no production engines were ever built from this design. Mr. Grunstra donated the engine along with various patterns, castings, extra parts, and a complete set of blueprints to the Miniature Engineering Craftsmanship Museum. This engine is not currently on display. 

Exhibit added: October 15, 2013 - Last modified: December 28, 2023

Presented by The Joe Martin Foundation for Exceptional Craftsmanship