Island Packet 31
Description
The Island Packet 31 (1983–1989, 204 hulls) is the boat that made Island Packet famous and remains the gold-standard compact bluewater cruiser for serious sailors on a realistic budget. With a 31′6″ overall length (bowsprit + boomkin), 10′6″ beam, 11,500 lb displacement, 4′6″ full keel carrying 4,500 lbs encapsulated lead, and a conservative cutter rig of 486 sq ft (SA/D ≈15.5), it is deliberately slow (expect 6–6.5 knots on passage) but virtually indestructible and supremely comfortable in any sea state. Below, the high-freeboard hull delivers astonishing volume: 6′4″+ headroom, huge U-shaped galley, full nav station, enclosed head with shower, long straight settees that double as perfect sea berths, and a private forward stateroom with offset double plus a true quarter berth aft—sleeping six in genuine privacy. Built to the classic over-engineered IP formula (solid hand-laid vinylester fiberglass hull, no coring below the waterline, bronze seacocks, teak everywhere), dozens have circumnavigated and hundreds more have logged decades in the trades. Still the most produced “big” Island Packet, clean examples remain in high demand.
Construction Details
| Designer | Robert K. Johnson |
|---|---|
| Builder | Island Packet Yachts |
| Length | 34.330 ft |
| LOA | 31.000 ft |
| LWL | 27.750 ft |
| Beam | 11.600 ft |
| Displacement | 11000 lb |
| Max Draft | 4.000 ft |
The standard boat dimensions
| i | 39.75 ft |
|---|---|
| j | 14.75 ft |
| p | 34 ft |
| e | 14 ft |
| p2 | - |
| e2 | - |
| i2 | - |
| j2 | - |
| I | J | P | E | P2 | E2 | I2 | J2 |
|---|---|---|---|---|---|---|---|
| 39.75 ft | 14.75 ft | 34 ft | 14 ft | - | - | - | - |
Documents
Blueprints
Sails
Island Packet 31 - MAINSAIL
| Luff | * 34 ft - (10363 mm) |
|---|---|
| Foot | * 14 ft - (4267 mm) |
| Leech | * 36.03 ft - (10982 mm) |
| Tack Angle | * 88 ° |
| Diagonal | * 36.31 ft - (11067 mm) |
| Head (inches) | * 6 in - (152 mm) |
| Area | * 245.34 ft² |
| Edit in Calculator | |
Island Packet 31 - JIBSAIL
| Luff | 39 ft - (11887 mm) |
|---|---|
| Foot | 18.25 ft - (5563 mm) |
| Leech | 32 ft - (9754 mm) |
| Percentage LP | * 100.54 % |
| Length Perpendicular | * 14.83 ft - (4520 mm) |
| Deck Angle | * 15.31 ° |
| Area | * 289.11 ft² |
| Edit in Calculator | |
Island Packet 31 - GENOA
| Luff | 39.75 ft - (12116 mm) |
|---|---|
| Foot | 21.33 ft - (6501 mm) |
| Leech | 36 ft - (10973 mm) |
| Percentage LP | * 130.17 % |
| Length Perpendicular | * 19.2 ft - (5852 mm) |
| Deck Angle | * 5.48 ° |
| Area | * 381.56 ft² |
| Edit in Calculator | |
Island Packet 31 - GENOA
| Luff | * 40.28 ft - (12277 mm) |
|---|---|
| Foot | * 20.81 ft - (6343 mm) |
| Leech | * 37.48 ft - (11424 mm) |
| Percentage LP | 130 % |
| Length Perpendicular | * 19.18 ft - (5846 mm) |
| Deck Angle | * 2.48 ° |
| Area | * 386.25 ft² |
| Edit in Calculator | |
Island Packet 31 - DRIFTER
| Luff | * 40.28 ft - (12277 mm) |
|---|---|
| Foot | * 25.38 ft - (7736 mm) |
| Leech | * 35.55 ft - (10836 mm) |
| Perc LP | * 149.97 % |
| Length Perp | * 22.12 ft - (6742 mm) |
| Deck Angle | * 9.01 ° |
| Area | * 445.45 ft² |
| Edit in Calculator | |
Island Packet 31 - DRIFTER
| Luff | 39 ft - (11887 mm) |
|---|---|
| Foot | 21.5 ft - (6553 mm) |
| Leech | 35 ft - (10668 mm) |
| Perc LP | * 130.03 % |
| Length Perp | * 19.18 ft - (5846 mm) |
| Deck Angle | * 6.52 ° |
| Area | * 373.95 ft² |
| Edit in Calculator | |
Island Packet 31 - ASYMMETRICAL
| Luff | 41 ft - (12497 mm) |
|---|---|
| Foot | 25 ft - (7620 mm) |
| Leech | 38 ft - (11582 mm) |
| Perc LP | * 165 % |
| Area | * 769 ft² |
| Edit in Calculator | |
Island Packet 31 - STAYSAIL
| Luff | 30 ft - (9144 mm) |
|---|---|
| Foot | 9 ft - (2743 mm) |
| Leech | 26 ft - (7925 mm) |
| Length Perpendicular | * 7.43 ft - (2265 mm) |
| Area | * 111.4 ft² |
| Edit in Calculator | |
Disclaimer. Boats are not all the same -- even when produced in the same factory of the same model. Sailrite does its best to publish accurate dimensions, but we often find it worthwhile to have our customers measure their boats carefully before we produce kits for them. You should take the same precautions, especially when the data is not from Sailrite. The information on this site is not guaranteed to be accurate. Sailrite offers this content as a service to our community, but takes no responsibility for the reliability of the data provided.