How can a Part 103 use a four-stroke engine? Well, you can elect the half-VW from Hummel…or you might try a rotary engine as seen at the 2005 Mid-Atlantic Fly-in. This innovative racing cart engine is being developed for Part 103 ultralight use (yes, to make the weight, with electric starter!) by Erik Pederson, the new president of Phantom Aeronautics. Impressively educated, Eric has a BS in Aero Engineering plus an MS and PhD in Mechanical Engineering. Watch for a test report when Erik is satisfied with the performance.