The Interlake is with a quick, snappy motion best suited to day sailing.
Hull Speed
The theoretical displacement-mode speed limit — determined by waterline length, not engine or sail power.
5.2 kts
A displacement hull pushes a bow wave whose speed is limited by the waterline length.
Performance Ratios
Racing handicap, sail-carrying power, stability and comfort — and what each one actually tells you about a day on the water.
Displacement / Length
81
Ultralight — responsive and fast, but carries less stores.
Comfort Ratio
5.4
Quick, snappy motion — better for day sails and racing than long passages.
Hull Speed
5.2kts
Pounds/Inch Immersion
2lbs
Weight needed to sink the hull one inch — loading sensitivity.
Motion & Offshore Suitability
Two ratios that matter most when you're planning passages — how the boat feels in a seaway, and whether the hull geometry is suitable for open ocean.
Comfort Ratio
5.4
Quick, snappy motion — better for day sails and racing than long passages.
Under 20 — Snappy, racing motion
20–30 — Acceptable coastal
30–40 — Good offshore comfort
Over 40 — Very comfortable offshore
How It Compares
Side-by-side with the boats most often cross-shopped against the Interlake.
| Interlake | Buccaneer 18 | Cape Cod Knockabout | Capri 18 Catalina | Mercury 18 | Rhodes 18 | |
|---|---|---|---|---|---|---|
| Dimensions | ||||||
| LOA | 18.0 | 18.0 | 18.0 | 18.0 | 18.0 | 18.0 |
| LWL | — | 16.7 | 15.5 | 16.3 | 13.0 | 17.0 |
| Beam | 6.3 | 6.0 | 6.0 | 7.6 | 5.3 | 6.3 |
| Displacement | 650 | 500 | 650 | 1 | 1 | 1 |
| Ballast | — | — | — | 425 | 635 | — |
| Sail Area | 175 | 175 | 165 | 155 | — | 162 |
| Performance | ||||||
| SA/Disp | — | 44.5 | 35.2 | 19.0 | — | 25.1 |
| Bal/Disp | — | — | — | 28.3 | 57.7 | — |
| Comfort | 5.4 | 4.2 | 5.7 | 9.3 | — | 8.2 |
| Capsize | — | 3.03 | 2.77 | 2.65 | — | 2.46 |
| Hull Speed | 5.2 | 5.5 | 5.3 | 5.4 | — | 5.5 |