JY15 vs K4
How do the JY15 and K4 compare? Below, their dimensions, displacement, sail area and the standard design ratios side by side, followed by a data-driven summary.
JY15 
K4 | JY15 | K4 | |
|---|---|---|
| Length overall | 15.0 ft4.57 m | 14.8 ft4.51 m |
| Waterline length | —— | —— |
| Beam | 5.8 ft1.78 m | 7.3 ft2.21 m |
| Draft | 3.0 ft0.91 m | —— |
| Displacement | 275 lb125 kg | 254 lb115 kg |
| Ballast | —— | —— |
| Sail area | 135 ft²12.5 m² | 118 ft²11.0 m² |
| SA / Displacement | 51.08 | 47.07 |
| Displacement / Length | — | — |
| Comfort ratio | — | — |
| Capsize screening | 3.59 | 4.58 |
| Hull speed (kn) | — | — |
JY15 vs K4: the short version
- The JY15 and K4 are close in length (15.0 ft4.57 m vs 14.8 ft4.51 m ).
- The JY15 is heavier, displacing about 8% more, which usually means a steadier but slower-to-accelerate hull.
- On sail area/displacement the JY15 carries the more powerful rig (51.1 vs 47.1), favouring lighter-air performance.
- By the capsize screening formula the JY15 rates better for offshore work (3.59 vs 4.58).
Ratios are guidelines computed from published specs; condition, layout and gear matter as much as the numbers.