The original: Dahlemer Binz built 140 RF 4s in the late 60s, and many still fly today. The plane has excellent flying characteristics and is licensed for aerobatics.

The model: Given the SD6060 airfoil, it too has excellent aerobatic ability.

This kit lacks hardware and is for experienced builders. The cowl and canopy assemblies are included.

The fiberglass cowl accepts a 4.75-inch (120 mm) spinner

The retractable landing gear is special-built for this model. It's very beefy and accepts a 6-inch (150 mm) wheel.