Catalina 18 vs Catalina 34
How do the Catalina 18 and Catalina 34 compare? Below, their dimensions, displacement, sail area and the standard design ratios side by side, followed by a data-driven summary.
Catalina 18 
Catalina 34 | Catalina 18 | Catalina 34 | |
|---|---|---|
| Length overall | 18.0 ft5.49 m | 34.5 ft10.52 m |
| Waterline length | 16.3 ft4.98 m | 29.8 ft9.09 m |
| Beam | 7.6 ft2.31 m | 11.8 ft3.58 m |
| Draft | 2.3 ft0.71 m | 5.6 ft1.70 m |
| Displacement | 1,500 lb680 kg | 11,950 lb5,420 kg |
| Ballast | 425 lb193 kg | 5,000 lb2,268 kg |
| Sail area | 151 ft²14.0 m² | 523 ft²48.6 m² |
| SA / Displacement | 18.44 | 16.01 |
| Displacement / Length | 154 | 201 |
| Comfort ratio | 9.3 | 22.2 |
| Capsize screening | 2.65 | 2.06 |
| Hull speed (kn) | 5.4 | 7.3 |
Catalina 18 vs Catalina 34: the short version
- The Catalina 34 is the larger boat at 34.5 ft10.52 m LOA versus 18.0 ft5.49 m for the Catalina 18.
- The Catalina 34 is heavier, displacing about 697% more, which usually means a steadier but slower-to-accelerate hull.
- On sail area/displacement the Catalina 18 carries the more powerful rig (18.4 vs 16.0), favouring lighter-air performance.
- The Catalina 34 scores higher on the Brewer comfort ratio, suggesting an easier motion in a seaway.
- By the capsize screening formula the Catalina 34 rates better for offshore work (2.06 vs 2.65).
Ratios are guidelines computed from published specs; condition, layout and gear matter as much as the numbers.