The Hummel 2 Cylinder VW — Powering the Hummelbird, Ultra Cruiser and other Experimental Amateur Built and Ultralight aircraft, Morry Hummel's 1/2 VW engine conversion plans have become a trusted standard in the aviation community. The original Hummel conversion has been refined over time, allowing larger displacement and the options of NiCom aluminum cylinders, dual ignition, alternator and electric start.
