Hull Speed
The theoretical displacement-mode speed limit — determined by waterline length, not engine or sail power.
5.8 kts
A displacement hull pushes a bow wave whose speed is limited by the waterline length.
With a waterline of 18.7′, the Sea Mini 21 tops out around 5.8 knots in displacement mode — after that, the bow wave outruns the hull and resistance climbs steeply.
1.34 × √18.7′ LWL = 5.8 kts
Performance Ratios
Racing handicap, sail-carrying power, stability and comfort — and what each one actually tells you about a day on the water.
Ballast / Displacement
38.1%
Stiff enough to carry a big genoa comfortably into moderate breeze.
Displacement / Length
158
Moderate — a good balance of speed and load-carrying ability.
Hull Speed
5.8kts
Pounds/Inch Immersion
3lbs
Weight needed to sink the hull one inch — loading sensitivity.
How It Compares
Side-by-side with the boats most often cross-shopped against the Sea Mini 21.
| Sea Mini 21 | Balaton 21 | Coco Archambault | Muscadet | Sylphe Dufour | Trotter | |
|---|---|---|---|---|---|---|
| Dimensions | ||||||
| LOA | 21.3 | 21.3 | 21.3 | 21.3 | 21.4 | 21.3 |
| LWL | 18.7 | 18.7 | 20.3 | 18.4 | 19.3 | 18.5 |
| Beam | 8.2 | 8.0 | 8.9 | 7.4 | 7.9 | 6.9 |
| Displacement | 2 | 3 | 2 | 2 | 3 | 2 |
| Ballast | 882 | 1 | 992 | 1 | 882 | — |
| Sail Area | — | 225 | 365 | 205 | 222 | — |
| Performance | ||||||
| SA/Disp | — | 15.8 | 31.5 | 17.2 | 16.4 | — |
| Bal/Disp | 38.1 | 35.3 | 39.1 | 43.3 | — | — |
| Comfort | — | 17.0 | 10.4 | 14.8 | 15.7 | — |
| Capsize | — | 2.13 | 2.60 | 2.15 | 2.15 | — |
| Hull Speed | — | 5.8 | 6.0 | 5.7 | 5.9 | — |