Yamaha 31 EX
Description
The Yamaha 31 EX (also known as Yamaha Ex 31 or Y-31 EX) is a Japanese-built fiberglass cruiser from the late 1980s–1990s, produced by Yamaha Marine. It reflects the brand's emphasis on solid construction, quality details, and a balance of performance with cruising comfort. The "EX" designation typically indicates an enhanced or export-oriented variant, often featuring a taller rig for improved light-air capability compared to standard or "S" models in the 31-foot range.
Construction Details
| Designer | In House Design |
|---|---|
| Builder | Yamaha Marine (Japan) |
| Length | 31.000 ft |
| LOA | 31.000 ft |
| Year Built | 1978 |
| Notes | Standard Rig: I: 37.73 ft / 11.50 m J: 12.13 ft / 3.70 m P: 32.81 ft / 10.00 m E: 9.84 ft / 3.00 m |
The standard boat dimensions
| i | 42 ft |
|---|---|
| j | 12.21 ft |
| p | 36.16 ft |
| e | 11.22 ft |
| p2 | - |
| e2 | - |
| i2 | - |
| j2 | - |
| I | J | P | E | P2 | E2 | I2 | J2 |
|---|---|---|---|---|---|---|---|
| 42 ft | 12.21 ft | 36.16 ft | 11.22 ft | - | - | - | - |
Sails
Yamaha 31 EX - MAINSAIL
| Luff | * 36.16 ft - (11022 mm) |
|---|---|
| Foot | * 11.22 ft - (3420 mm) |
| Leech | * 37.24 ft - (11351 mm) |
| Tack Angle | * 88 ° |
| Diagonal | * 37.48 ft - (11424 mm) |
| Head (inches) | * 5.25 in - (133 mm) |
| Area | * 209.56 ft² |
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Yamaha 31 EX - JIBSAIL
| Luff | * 34.99 ft - (10665 mm) |
|---|---|
| Foot | * 15.93 ft - (4855 mm) |
| Leech | * 30.84 ft - (9400 mm) |
| Percentage LP | * 114.99 % |
| Length Perpendicular | * 14.04 ft - (4279 mm) |
| Deck Angle | * 12 ° |
| Area | * 245.59 ft² |
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Yamaha 31 EX - GENOA
| Luff | * 41.55 ft - (12664 mm) |
|---|---|
| Foot | * 19.52 ft - (5950 mm) |
| Leech | * 39.34 ft - (11991 mm) |
| Percentage LP | * 150.04 % |
| Length Perpendicular | * 18.32 ft - (5584 mm) |
| Deck Angle | * 3.98 ° |
| Area | * 380.61 ft² |
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Yamaha 31 EX - SPINNAKER
| Stays | * 41.55 ft - (12664 mm) |
|---|---|
| MidGirth | * 21.98 ft - (6700 mm) |
| Foot | * 21.98 ft - (6700 mm) |
| Perc LP | * 180 % |
| Area | * 776 ft² |
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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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