Catalina 18 vs Interlake
How do the Catalina 18 and Interlake compare? Below, their dimensions, displacement, sail area and the standard design ratios side by side, followed by a data-driven summary.
Catalina 18 
Interlake | Catalina 18 | Interlake | |
|---|---|---|
| Length overall | 18.0 ft5.49 m | 18.0 ft5.49 m |
| Waterline length | 16.3 ft4.98 m | —— |
| Beam | 7.6 ft2.31 m | 6.3 ft1.91 m |
| Draft | 2.3 ft0.71 m | 4.6 ft1.40 m |
| Displacement | 1,500 lb680 kg | 650 lb295 kg |
| Ballast | 425 lb193 kg | —— |
| Sail area | 151 ft²14.0 m² | 175 ft²16.3 m² |
| SA / Displacement | 18.44 | 37.31 |
| Displacement / Length | 154 | — |
| Comfort ratio | 9.3 | — |
| Capsize screening | 2.65 | 2.89 |
| Hull speed (kn) | 5.4 | — |
Catalina 18 vs Interlake: the short version
- The Catalina 18 and Interlake are close in length (18.0 ft5.49 m vs 18.0 ft5.49 m ).
- The Catalina 18 is heavier, displacing about 131% more, which usually means a steadier but slower-to-accelerate hull.
- On sail area/displacement the Interlake carries the more powerful rig (37.3 vs 18.4), favouring lighter-air performance.
- By the capsize screening formula the Catalina 18 rates better for offshore work (2.65 vs 2.89).
Ratios are guidelines computed from published specs; condition, layout and gear matter as much as the numbers.