Yamaha 25 III
Description
The Yamaha 25 III (also known as Yamaha 25-3 or Y-25 III) is a Japanese-built fiberglass cruiser-racer from the late 1970s, part of Yamaha Marine’s short-lived but high-quality sailboat production line. It appears to be a further refinement or variant of the Yamaha 25 II (Mk II), sharing the same core design philosophy as an IOR-influenced ¼-tonner optimized for club racing and coastal cruising. Detailed factory specifications for the exact "III" variant are less commonly published than for the 25-2, but rig dimensions and sail data confirm it is closely related, with minor updates possibly in rig tuning, interior details, or sail plan optimization.
Construction Details
| Designer | In House Design |
|---|---|
| Builder | Yamaha Marine (Japan) |
| Length | 24.770 ft |
| LOA | 24.770 ft |
| LWL | 19.250 ft |
| Beam | 9.000 ft |
| Displacement | 3748 lb |
| Ballast | 1433 lb |
| Max Draft | 5.500 ft |
| Year Built | 1978 |
The standard boat dimensions
| i | 29.04 ft |
|---|---|
| j | 9.25 ft |
| p | 27.40 ft |
| e | 9.74 ft |
| p2 | - |
| e2 | - |
| i2 | - |
| j2 | - |
| I | J | P | E | P2 | E2 | I2 | J2 |
|---|---|---|---|---|---|---|---|
| 29.04 ft | 9.25 ft | 27.40 ft | 9.74 ft | - | - | - | - |
Sails
Yamaha 25 III - MAINSAIL
| Luff | * 27.4 ft - (8352 mm) |
|---|---|
| Foot | * 9.74 ft - (2969 mm) |
| Leech | * 28.63 ft - (8726 mm) |
| Tack Angle | * 87.95 ° |
| Diagonal | * 28.75 ft - (8763 mm) |
| Head (inches) | * 4.5 in - (114 mm) |
| Area | 133.28 ft² |
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Yamaha 25 III - JIBSAIL
| Luff | * 24.38 ft - (7431 mm) |
|---|---|
| Foot | * 12.24 ft - (3731 mm) |
| Leech | * 21.18 ft - (6456 mm) |
| Percentage LP | * 115 % |
| Length Perpendicular | * 10.64 ft - (3243 mm) |
| Deck Angle | * 12 ° |
| Area | 129.62 ft² |
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Yamaha 25 III - GENOA
| Luff | * 28.95 ft - (8824 mm) |
|---|---|
| Foot | * 14.93 ft - (4551 mm) |
| Leech | * 27.24 ft - (8303 mm) |
| Percentage LP | * 150 % |
| Length Perpendicular | * 13.88 ft - (4231 mm) |
| Deck Angle | * 4 ° |
| Area | 200.86 ft² |
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Yamaha 25 III - SPINNAKER
| Stays | * 28.95 ft - (8824 mm) |
|---|---|
| MidGirth | * 16.65 ft - (5075 mm) |
| Foot | * 16.65 ft - (5075 mm) |
| Perc LP | * 180 % |
| Area | 409.71 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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