Interlake vs Sanibel 18
How do the Interlake and Sanibel 18 compare? Below, their dimensions, displacement, sail area and the standard design ratios side by side, followed by a data-driven summary.
Interlake 
Sanibel 18 | Interlake | Sanibel 18 | |
|---|---|---|
| Length overall | 18.0 ft5.49 m | 17.9 ft5.45 m |
| Waterline length | —— | 15.1 ft4.59 m |
| Beam | 6.3 ft1.91 m | 7.8 ft2.38 m |
| Draft | 4.6 ft1.40 m | 4.0 ft1.22 m |
| Displacement | 650 lb295 kg | 1,369 lb621 kg |
| Ballast | —— | 450 lb204 kg |
| Sail area | 175 ft²16.3 m² | 170 ft²15.8 m² |
| SA / Displacement | 37.31 | 22.06 |
| Displacement / Length | — | 179 |
| Comfort ratio | — | 8.6 |
| Capsize screening | 2.89 | 2.81 |
| Hull speed (kn) | — | 5.2 |
Interlake vs Sanibel 18: the short version
- The Interlake and Sanibel 18 are close in length (18.0 ft5.49 m vs 17.9 ft5.45 m ).
- The Sanibel 18 is heavier, displacing about 111% 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 22.1), favouring lighter-air performance.
- By the capsize screening formula the Sanibel 18 rates better for offshore work (2.81 vs 2.89).
Ratios are guidelines computed from published specs; condition, layout and gear matter as much as the numbers.