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For this reason, it is not uncommon to find boats with a combination of shallow keel and centreboard (e.g. Randmeer). The keel provides the housing for the centreboard, moving it out of the hull, but adds only a small amount of draft to the boat. The centreboard can then be lowered in deeper waters to increase the amount of lift.
The keel-equipped version of the boat has a draft of 6 ft 2 in (1.88 m), or 4 ft 10 in (1.47 m) with the optional shoal draft keel. The centerboard-equipped version has a draft of 8 ft 6 in (2.59 m) with the centerboard extended and 3 ft 10 in (1.17 m) with it retracted, allowing operation in shallow water.
The keel-equipped version of the boat has a draft of 2.67 ft (0.81 m), while the centerboard-equipped version has a draft of 4.00 ft (1.22 m) with the centerboard extended and 7 in (18 cm) with it retracted, allowing operation in shallow water, beaching or ground transportation on a trailer.
The Tartan 27 is a recreational keelboat, built predominantly of fiberglass, with wood trim.It has a masthead sloop rig, a raked stem, an angled transom, a keel-mounted rudder controlled by a tiller and a fixed modified long keel with a cutaway forefoot and a retractable centerboard.
The boat has a hull speed of 6.21 kn (11.50 km/h). [ 2 ] [ 4 ] [ 5 ] The design has a PHRF handicap of 195-222 for the fin keel model, 116-225 for the centerboard model and 204-222 for the twin keel model.
The keel-equipped version of the boat has a draft of 3.30 ft (1.01 m), while the centreboard-equipped version has a draft of 4.92 ft (1.50 m) with the centreboard extended and 0.83 ft (0.25 m) with it retracted, allowing beaching or ground transportation on a trailer. The centerboard weighs 210 lb (95 kg).
The boat two centerboard configurations. One has a fixed keel and centerboard and it has a draft of 5.00 ft (1.52 m) with the centerboard extended and 2.50 ft (0.76 m) with it retracted. The other has a centerboard that retracts into a trunk and it has a draft of 5.42 ft (1.65 m) with the centreboard extended and 1.00 ft (0.30 m) with it ...
The boats with lead ballast in shoal keel and centerboard have 600 lb (272 kg) of ballast. [ 1 ] [ 4 ] The boat has a draft of 3.50 ft (1.07 m) with the keel extended and 1.75 ft (0.53 m) with it retracted, allowing operation in shallow water or ground transportation on a trailer .