Design and Construction
Gulfstar Inc. built the 53 MS in the United States with a solid-fiberglass hull and fin keel. Depending on load, reported draft ranges from 4.49 to 4.79 feet.
The boat measures 53 feet overall, with a 47.25-foot waterline and a 15-foot beam. Its length-to-beam ratio of 3.53 makes it beamy for a cruiser of its era. Displacement is 44,000 pounds, with lead ballast. A ballast ratio near 11 percent and a displacement-length ratio of 186 place the boat firmly at the heavy, volume-driven end of the cruising spectrum.
A Motion Comfort Ratio of 37.4 and a capsize screening value of 1.70 describe a hull shaped more for steady motion than quick performance. The underbody has about 688 square feet of wetted surface. An immersion rate of roughly 2,469 pounds per inch means the boat sits heavily and changes trim slowly as weight is added.
Rig and Handling
The ketch carries a modest sail plan for its weight. By modern light-air standards, it is undercanvased, but that is consistent with a motorsailer intended to rely on auxiliary power during passages. Dividing the sail plan between two masts also spreads the handling loads, a sensible arrangement on a boat with this displacement and beam.
The running rigging reflects the scale of the boat. The mainsail, jib, genoa, and spinnaker halyards are each 118 feet long. The mainsheet is 132.5 feet, while the working-jib and genoa sheets are 53 feet long.
Calculated maximum speed is about 8.8 knots, compared with a theoretical displacement-hull speed of 9.2 knots. Regardless of the breeze, the design is therefore physically limited to speeds in the single digits.
Accommodations and Cruising Role
With 400 gallons each of fuel and water, the 53 MS was laid out for long-range life aboard rather than weekend racing. Its shallow draft broadens the choice of anchorages and marinas, a genuine advantage for a 44,000-pound cruiser that might otherwise be restricted to deepwater berths.
A Perkins diesel producing roughly 130 horsepower drives a single shaft. The combination of substantial tankage, auxiliary power, and a modest sail plan makes the boat’s priorities clear: this is a motorsailer intended for extended cruising, with the engine playing a central role.
Age, Refits, and Ownership
Production ended in 1975 after 27 boats, so surviving 53 MS hulls are now decades into their service lives. Buyers and owners should expect period-correct systems either to have been renewed already or to need renewal.
The shallow-draft fin keel and solid-fiberglass hull make the structural survey simpler than it would be on cored contemporaries. Even so, the age and condition of the rigging and tankage will govern the real cost of ownership.
Verdict
The Gulfstar 53 MS is a purposeful, heavy-displacement ketch motorsailer, built in small numbers for comfortable long-range cruising rather than performance. Its shallow draft, voluminous tankage, and steady-motion figures make it a rational choice for a couple or family cruising shallow coasts. The modest sail plan and limited hull speed are equally clear reminders that the engine, rather than the wind, is the primary means of propulsion.
Pros
- Draft of less than 4.8 feet opens up marginal anchorages and marinas
- Heavy 44,000-pound displacement and a Motion Comfort Ratio of 37.4 support steady motion
- Only 27 were built, forming a manageable and documented small class
Cons
- Modest sail area relative to displacement limits performance under sail
- Calculated maximum speed of about 8.8 knots limits passage pace
- The small production run means shared owner knowledge is sparse
