Based in Coolidge Arizona, US. Hummel Engines is modifying the original Volkswagen air-cooled engine for use in small, personal 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.
The Hummel two cylinder VW engine is powering the Hummelbird, Ultra Cruiser and other experimental amateur built and ultralight aircraft, these engines have become the standard in the experimental aviation community.
Scott Casler's VW conversions are available for many popular homebuilts and Light Sport Aircraft. Hummel Engines have powered aircraft designs like the Sonerai, Sonex, Ultracruiser Plus, Aerosport Quail, Avid Flyer, Corby Starlet and others. They are now building TEAM SuperMax.
|Engine Model||Horsepower||Bore x Stroke||Displacement|
|2 Cylinder Models||28 hp||88 x 69 mm||840 cm3|
|32 hp||92 x 69 mm||917 cm3|
|37 hp||92 x 78 mm||1037 cm3|
|45 hp||94 x 86 mm||1200 cm3|
|4 Cylinder Models||50 hp||85.5 x 69 mm||1600 cm3|
|60 hp||92 x 69 mm||1835 cm3|
|76 hp||92 x 82 mm||2180 cm3|
|85 hp||94 x 86 mm||2400 cm3|
Engine weight for the two cylinder varies between 81 and 103 lbs, the four cylinder weighs between 135 and 167 lbs.
Hummel Engines has the capability to perform the machining operations required for VW conversions, maintenance and upgrades. Contact the owner, Scott Casler, with your requirements for a price quotation.
Speaking in forums and clinics at several national and regional aviation events, Scott Casler has established himself as the leading source of half VW conversion information and related products. With hundreds of hours of VW based flight time and a full line of parts and services, he has the experience and knowledge required to support your VW conversion.
More detailed information and history about the VW air cooled engine can be found at its Wikipedia page.
Hummel Engines can be visited and reached at:
|Hummel Engines, Scott Casler|
|5464 East Storey Road|
|Coolidge, AZ 85128 USA|
|See contact page|
Text and images used with permission (pending) of Hummel Engines.