Design and Construction
The hull and deck are solid fiberglass, while the hull itself uses a balsa-cored sandwich construction. That core insulates the accommodation from cold water and reduces condensation below, creating an indoor climate that the design records describe as better than that of a single-skin hull. In other words, the sandwich construction improves the indoor climate.
Interior joinery is teak, and headroom is above average for a boat of this size. The 10-foot beam and length-to-beam ratio of 3.08 make her roomier than 58 percent of similar sailboats. That space comes from her beamy midsection rather than any illusion of volume.
The iron fin keel provides a 40 percent ballast ratio. That is just below the average for comparable designs, and the figures suggest that her resistance to heeling is slightly below par. Draft ranges from 5.74 to 6.04 feet, depending on load—enough to settle her into most marinas. With a spade rudder and a displacement-length ratio of 268, she falls into the moderate-racer category rather than being a slug.
Rig, Performance, and Handling
The masthead rig carries 41.2 square meters of mainsail and jib area. Standing and running rigging follow period norms: halyards are 29.6 meters long and 10 mm in diameter, while sheets range from 9.4 to 23.5 meters at 12 mm.
Her sail-area-to-displacement ratio is 15.3 with the ISO reference sail and 18.1 with a 135 percent genoa. The design data characterizes her as slightly underrigged and faster than only 38 percent of similar boats in light air. Her overall figures are more favorable, however: a Relative Speed Performance of 62 places her ahead of 62 percent of comparable designs. The theoretical hull speed is 6.6 knots.
Accommodations and Tankage
Below, the Granada 31 has six berths, a galley, and a toilet facility, all under above-average headroom and finished with teak joinery. A 100-liter freshwater tank supports coastal cruising without constant replenishment.
The balsa-sandwich hull also contributes to a warmer, drier cabin. That makes the Granada 31 a credible shoulder-season boat in northern European waters.
Fuel is carried in a 50-liter stainless steel tank, also described as having a 13-gallon capacity. That modest supply suits a boat whose sailing performance is the main draw rather than long passages under power.
Engine
The optional inboard engine is a 13-horsepower Volvo Penta MD7 diesel driving a saildrive. Its calculated maximum speed under power is roughly 4.4 knots, compared with the boat’s theoretical sailing hull speed of 6.6 knots.
Known Issues and Refit Considerations
The same balsa core that improves comfort below also demands careful maintenance. Every penetration through the sandwich needs particular attention, because any route that allows water to reach the core can eventually lead to rot. Once saturated, a rotted balsa core can be costly or irreparable. Buyers and owners should therefore treat every through-hull, fastening, and deck fitting as a potential water-ingress point.
Build history is another important consideration. Because Granada also sold the 31 for home completion, workmanship may vary widely from one boat to another, particularly when compared with a factory-finished example. Some hulls may have owner-installed systems of unknown provenance, so any refit plan should begin by establishing which work was done at the factory and which was not.
The Verdict
The Granada 31 is a thoughtfully engineered small Danish cruiser. Her balsa-cored hull brings genuine benefits in insulation and condensation control, while her broad midsection provides useful room for the length. She also has a credible overall performance envelope and a documented production run of 750 boats.
The home-completion option and the vulnerable core are the principal caveats. Any prospective buyer should survey the boat carefully for water intrusion and verify its build provenance before committing.
Pros
- Balsa-sandwich hull insulates against cold and reduces cabin condensation
- Above-average headroom
- Roomier than 58 percent of similar designs
- Moderate-racer displacement-length ratio
- Theoretical hull speed of 6.6 knots under sail
- A production run of 750 boats provides reasonable parts and sister-ship familiarity
Cons
- Home-completion sales mean build quality can vary between boats
- Balsa core can rot if penetrated and wetted, with repairs costly or impossible
- Slightly below-average ballast ratio limits resistance to heeling
- Slightly underrigged compared with peers in light air
