The S2 6.7 Grand Slam is an American trailerable sailboat that was designed by Don Wennersten as a racer-cruiser and first built in 1980.
[1][3] The fixed keel-equipped version of the boat has a draft of 4.50 ft (1.37 m), while the lifting keel-equipped version has a draft of 4.50 ft (1.37 m) with the centerboard extended and 10 in (25 cm) with it retracted, allowing operation in shallow water, beaching or ground transportation on a trailer.
Under the water she has a retractable keel and rudder which make her easily trailerable and capable of skimming right up to a beach.
"[6] In a 2010 review Steve Henkel wrote, "Best features: ... the S2 6.7 ... hull ... [has] practically nothing below the waterline with the lifting keel in the up position, making launching and retrieving on a trailer a comparatively easy job.
Worst features: ... the heavy lifting keel and its attendant winch is bound to cause problems sooner or later, just by the nature of the beast.