Catalina 18 vs Mercury 18
How do the Catalina 18 and Mercury 18 compare? Below, their dimensions, displacement, sail area and the standard design ratios side by side, followed by a data-driven summary.
Catalina 18 
Mercury 18 | Catalina 18 | Mercury 18 | |
|---|---|---|
| Length overall | 18.0 ft5.49 m | 18.0 ft5.49 m |
| Waterline length | 16.3 ft4.98 m | 13.0 ft3.96 m |
| Beam | 7.6 ft2.31 m | 5.3 ft1.62 m |
| Draft | 2.3 ft0.71 m | 3.1 ft0.94 m |
| Displacement | 1,500 lb680 kg | 1,100 lb499 kg |
| Ballast | 425 lb193 kg | 635 lb288 kg |
| Sail area | 151 ft²14.0 m² | 167 ft²15.5 m² |
| SA / Displacement | 18.44 | 25.08 |
| Displacement / Length | 154 | 224 |
| Comfort ratio | 9.3 | 12.6 |
| Capsize screening | 2.65 | 2.07 |
| Hull speed (kn) | 5.4 | 4.8 |
Catalina 18 vs Mercury 18: the short version
- The Catalina 18 and Mercury 18 are close in length (18.0 ft5.49 m vs 18.0 ft5.49 m ).
- The Catalina 18 is heavier, displacing about 36% more, which usually means a steadier but slower-to-accelerate hull.
- On sail area/displacement the Mercury 18 carries the more powerful rig (25.1 vs 18.4), favouring lighter-air performance.
- The Mercury 18 scores higher on the Brewer comfort ratio, suggesting an easier motion in a seaway.
- By the capsize screening formula the Mercury 18 rates better for offshore work (2.07 vs 2.65).
Ratios are guidelines computed from published specs; condition, layout and gear matter as much as the numbers.