The Hinterhoeller F3 (or F 3) is a Canadian sailboat that was designed by Argentine naval architect Germán Frers as a racer-cruiser and first built in 1981. The F3 design moulds were later sold and the boat was developed into the in 1982, with a new deck and coach house design. It was later further developed into the and during its production run saw many changes to the rig, rudder and keel designs.