Design and Construction
The Seastream 43 has a solid-fibreglass hull, fin keel, and skeg-hung rudder. Her ballast ratio is close to 36 percent. Combined with her displacement, this gives her a low center of gravity and a stiff, stable posture under sail.
Her capsize screening figure falls between 1.77 and 1.79, placing her firmly among moderate bluewater cruising boats. The published assessment considers her a safer choice for an ocean passage than a yacht with a CSF above 2.0.
The mast is deck-stepped, an arrangement noted as potentially less strong than a keel-stepped mast. This is a trade-off accepted in a design intended to provide manageable deck-level rigging rather than accommodate extreme rig loads.
A Perkins diesel is the typical inboard installation, driving through a shaft. Tankage comprises 125 gallons of fuel and 210 gallons of water, allowing a crew to load the boat with cruising gear while hardly disturbing the waterline.
Rig, Sailing Performance, and Handling
The deck-stepped cutter rig has stainless-steel standing rigging and two sets of spreaders. The sail plan includes a mainsail, roller-furling genoa, and hanked staysail. The mainsail has three-point slab reefing, lazy jacks, and a stack pack, making it straightforward to handle. The genoa and staysail lead to winches on the cockpit coaming, with their sheets running through tracks on the side decks or coachroof. A spinnaker pole stows on the mast for use with a chute or cruising sail.
The Seastream 43 isn’t fast, but she is steady and comfortable. She sails well in light to moderate winds, although she may need engine assistance in very light airs. Because she lacks a stiffness-enhancing bulb keel, she benefits from being reefed early to stay upright in a moderate breeze.
Properly balanced and reefed, she handles strong winds and rough seas. Her heavy displacement and long waterline give her a comfortable motion that glides rather than hobby-horses or slams.
Pilothouse, Cockpit, and Accommodation
The pilothouse provides excellent visibility from the helm. Twin sliding doors open to the side decks and cockpit, and the helm includes controls for the engine, bow thruster, and windlass. Aft, the cockpit is protected by a sprayhood and bimini, with long benches and a lazarette.
Below, three separate cabins and two heads provide sleeping space for up to eight people. The forward cabin has a V-berth with an infill, a hanging locker, and drawers. It also has an ensuite head with a marine toilet, sink, and shower.
The aft cabin contains a double berth, locker, and shelves. It shares the second head—which also has a marine toilet, sink, and shower—with the saloon. A third cabin, to starboard of the saloon, has two single bunks, a locker, and drawers.
The large saloon includes a U-shaped settee to port that converts into a double berth. A starboard settee serves as a single berth, and a folding table seats six.
The galley is to port in the pilothouse and includes a three-burner gas stove, oven, grill, double stainless-steel sink, and top-loading refrigerator. Opposite, the navigation station provides a large chart table and full instrument panel.
Known Issue
The only design caveat in the record is the deck-stepped mast, which may be less strong than a keel-stepped mast under extreme loads.
The Verdict
The Seastream 43 is a purpose-built offshore pilothouse cutter that trades speed for steadiness and load-carrying range. Her accommodation is generous for a 43-footer, and her tankage supports long passages. Her motion and stability figures also mark her as a considered candidate for ocean sailing. The deck-stepped rig is the one noted compromise compared with a keel-stepped alternative.
Pros
- Heavy displacement and a high ballast ratio provide stiff, stable offshore behavior
- Three cabins, two heads, and a large saloon accommodate up to eight people
- 125 gal of fuel and 210 gal of water support heavily loaded passage-making
- Comfortable motion at sea, with no hobby-horsing according to the review
Cons
- The deck-stepped mast is potentially less strong than a keel-stepped alternative
- Without a stiffness-enhancing bulb keel, she needs early reefing in a moderate breeze
- She isn’t ideal for coastal sailing; offshore work is needed to show her worth
