Built from 1983 to 1989, this Bob Johnson-designed cruiser represents Island Packet's commitment to seaworthy, comfortable passage-making vessels. With 262 hulls produced during its six-year run, the IP 31 established itself as a popular choice among serious coastal and offshore cruisers seeking a manageable yet capable platform. The boat's long keel configuration and substantial 11,000-pound displacement create exceptional directional stability and a forgiving motion in seas, while the 4,500 pounds of ballast provide reassuring stiffness. The cutter rig arrangement offers versatility in sail handling, particularly valuable when conditions deteriorate offshore. With a comfort ratio of 22.62, this design prioritizes seakindliness over speed, making extended passages notably pleasant for the crew. Island Packet's reputation for quality fiberglass construction shines through in this model, featuring the builder's characteristic attention to structural integrity and finish details. The moderate sail area-to-displacement ratio of 17.2 reflects the design philosophy of steady progress rather than racing performance. While the hull speed of 7.06 knots won't win any races, the boat's ability to maintain course and comfort in challenging conditions has earned it respect among blue-water cruisers who value reliability over speed.
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What is the Island Packet 31's sail area to displacement ratio?
The Island Packet 31 has a Sail Area to Displacement ratio (SA/D) of 17.2. Values between 14–18 are typical cruising sailboats; 18–22 is cruiser/racer; over 22 is performance racing.
What is the Island Packet 31's comfort ratio?
The Island Packet 31 has a Ted Brewer Comfort Ratio of 22.62. A ratio over 30 indicates good offshore comfort; over 40 is very comfortable offshore.
Is the Island Packet 31 safe for offshore sailing?
The Island Packet 31 has a Capsize Screening Formula value of 2.09. Values under 2.0 are considered acceptable for offshore sailing; under 1.8 is ideal.
What is the hull speed of the Island Packet 31?
The theoretical hull speed of the Island Packet 31 is 7.06 kn knots, calculated from its waterline length.
How much does a Island Packet 31 weigh?
The Island Packet 31 has a displacement of 11,000.00 lb and a length overall (LOA) of 31.00 ft.
How much does a used Island Packet 31 cost?
Based on 8 recent market listings, used Island Packet 31 sailboats typically sell for between $39,000 and $70,000, with a median asking price of $50,000. Price varies significantly based on year, condition, location, and included equipment.
Who designed the Island Packet 31?
The Island Packet 31 was designed by Bob Johnson, first built in 1983.