Whats the difference between the HRII and the F-1?
Hay Carumba! This is a tough one and requires a bit of history. Let’s go way back…. Ray Stits built a small homebuilt known as a Playboy. Dick Van Grunsven, of Van’s Aircraft, built one and then improved it. Eventually it developed into the RV-3. The RV-3 grew into an RV-4. John Harmon built souped up versions of both the RV-3 and RV-4. These hot rods were known as Rockets. John developed a conversion kit (more about that later) to modify an RV-4 kit into the HRII. Mark Frederick then developed the F-1, which did not require a builder to purchase anything from Van’s.
