Yamaha 25 II
Description
The Yamaha 25 II (also known as Yamaha 25-2, Yamaha 25 Mk II, or Y-25 Mk II) is a Japanese-built fiberglass cruiser-racer from the mid-to-late 1970s. Produced by Yamaha Marine, it was designed by Ichiro Yokoyama (with Yamaha input) as an IOR ¼-tonner — optimized for racing under the International Offshore Rule while still serving as a capable coastal cruiser. It features high-quality Japanese construction with excellent fiberglass layup and thoughtful details.
Construction Details
| Designer | Ichiro Yokoyama |
|---|---|
| Builder | Yamaha Marine (Japan) |
| Length | 24.750 ft |
| LOA | 24.770 ft |
| LWL | 19.250 ft |
| Beam | 8.960 ft |
| Displacement | 3748 lb |
| Ballast | 1433 lb |
| Max Draft | 5.400 ft |
The standard boat dimensions
| i | 30.50 ft |
|---|---|
| j | 9.78 ft |
| p | 27.90 ft |
| e | 9.02 ft |
| p2 | - |
| e2 | - |
| i2 | - |
| j2 | - |
| I | J | P | E | P2 | E2 | I2 | J2 |
|---|---|---|---|---|---|---|---|
| 30.50 ft | 9.78 ft | 27.90 ft | 9.02 ft | - | - | - | - |
Documents
Sails
Yamaha 25 II - MAINSAIL
| Luff | * 27.9 ft - (8504 mm) |
|---|---|
| Foot | * 9.02 ft - (2749 mm) |
| Leech | * 28.74 ft - (8760 mm) |
| Tack Angle | * 88 ° |
| Diagonal | * 29.02 ft - (8845 mm) |
| Head (inches) | * 4 in - (102 mm) |
| Area | * 128.36 ft² |
| Edit in Calculator |
Yamaha 25 II - JIBSAIL
| Luff | 26.5 ft - (8077 mm) |
|---|---|
| Foot | 11.33 ft - (3453 mm) |
| Leech | 23 ft - (7010 mm) |
| Percentage LP | * 100.2 % |
| Length Perpendicular | * 9.8 ft - (2987 mm) |
| Deck Angle | * 12.37 ° |
| Area | * 129.81 ft² |
| Edit in Calculator |
Yamaha 25 II - GENOA
| Luff | 30.25 ft - (9220 mm) |
|---|---|
| Foot | 13.75 ft - (4191 mm) |
| Leech | 28.083 ft - (8560 mm) |
| Percentage LP | * 130.06 % |
| Length Perpendicular | * 12.72 ft - (3877 mm) |
| Deck Angle | * 4.51 ° |
| Area | * 192.43 ft² |
| Edit in Calculator |
Yamaha 25 II - GENOA
| Luff | 30.5 ft - (9296 mm) |
|---|---|
| Foot | 15.75 ft - (4801 mm) |
| Leech | 28.75 ft - (8763 mm) |
| Percentage LP | * 149.9 % |
| Length Perpendicular | * 14.66 ft - (4468 mm) |
| Deck Angle | * 3.7 ° |
| Area | * 223.51 ft² |
| Edit in Calculator |
Yamaha 25 II - ASYMMETRICAL
| Luff | 31 ft - (9449 mm) |
|---|---|
| Foot | 16.5 ft - (5029 mm) |
| Leech | 28.5 ft - (8687 mm) |
| Perc LP | * 165 % |
| Area | * 384 ft² |
| Edit in Calculator |
Yamaha 25 II - SPINNAKER
| Stays | * 30.43 ft - (9275 mm) |
|---|---|
| MidGirth | * 17.6 ft - (5364 mm) |
| Foot | * 17.6 ft - (5364 mm) |
| Perc LP | * 180 % |
| Area | * 455 ft² |
| Edit in Calculator |
Yamaha 25 II - STORMJIB
| Luff | 16 ft - (4877 mm) |
|---|---|
| Foot | 8 ft - (2438 mm) |
| Leech | 12.75 ft - (3886 mm) |
| Perc LP | * 64.52 % |
| Length Perp | * 6.31 ft - (1923 mm) |
| Deck Angle | * 20.17 ° |
| Area | * 50.47 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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