Piver 31 AA
Description
The Piver 31 AA (more precisely the AA-31 in Arthur Piver's "Advanced Amateur" series) is a mid-sized cruising trimaran from the mid-1960s, designed for amateur or semi-professional builders with enhanced performance and carrying capacity compared to his earlier "Standard" plywood designs. It builds on Piver's philosophy of simple, lightweight, plywood-and-fiberglass construction (often sheathed in fiberglass over marine plywood with double chines for better hydrodynamics and load-bearing), aimed at coastal/offshore cruising while remaining somewhat trailable (with demountable beams reducing width for road transport). This model was part of the AA lineup (Advanced Amateur), which featured sleeker, more sophisticated hull shapes (similar to his professional PI-Series) but simplified for home builders with moderate woodworking skills—no lofting required, using lumberyard materials. The AA series offered about 20% more payload than standard designs without sacrificing speed or handling.
Construction Details
| Designer | Arthur Piver |
|---|---|
| Builder | Home Built |
| Length | 31.000 ft |
| LOA | 31.000 ft |
| Beam | 18.000 ft |
| Max Draft | 2.000 ft |
| Year Built | 1965 |
The standard boat dimensions
| i | 41.50 ft |
|---|---|
| j | 13.50 ft |
| p | 33 ft |
| e | 13 ft |
| p2 | - |
| e2 | - |
| i2 | - |
| j2 | - |
| I | J | P | E | P2 | E2 | I2 | J2 |
|---|---|---|---|---|---|---|---|
| 41.50 ft | 13.50 ft | 33 ft | 13 ft | - | - | - | - |
Documents
Sails
Piver 31 AA - MAINSAIL
| Luff | * 33 ft - (10058 mm) |
|---|---|
| Foot | * 13 ft - (3962 mm) |
| Leech | * 34.86 ft - (10625 mm) |
| Tack Angle | * 87.98 ° |
| Diagonal | * 35.04 ft - (10680 mm) |
| Head (inches) | * 6 in - (152 mm) |
| Area | 214.23 ft² |
| Edit in Calculator |
Piver 31 AA - JIBSAIL
| Luff | * 34.91 ft - (10641 mm) |
|---|---|
| Foot | * 17.93 ft - (5465 mm) |
| Leech | * 30.23 ft - (9214 mm) |
| Percentage LP | * 115 % |
| Length Perpendicular | * 15.53 ft - (4734 mm) |
| Deck Angle | * 12 ° |
| Area | 270.98 ft² |
| Edit in Calculator |
Piver 31 AA - GENOA
| Luff | * 41.46 ft - (12637 mm) |
|---|---|
| Foot | * 21.84 ft - (6657 mm) |
| Leech | * 38.95 ft - (11872 mm) |
| Percentage LP | * 150 % |
| Length Perpendicular | * 20.25 ft - (6172 mm) |
| Deck Angle | * 4 ° |
| Area | 419.73 ft² |
| Edit in Calculator |
Piver 31 AA - SPINNAKER
| Stays | * 41.46 ft - (12637 mm) |
|---|---|
| MidGirth | * 24.3 ft - (7407 mm) |
| Foot | * 24.3 ft - (7407 mm) |
| Perc LP | * 180 % |
| Area | 856.36 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.
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