The Saturn 47 is with acceptable motion comfort for coastal passages.
Hull Speed
The theoretical displacement-mode speed limit — determined by waterline length, not engine or sail power.
8.5 kts
A displacement hull pushes a bow wave whose speed is limited by the waterline length.
With a waterline of 40.6′, the Saturn 47 tops out around 8.5 knots in displacement mode — after that, the bow wave outruns the hull and resistance climbs steeply.
1.34 × √40.6′ LWL = 8.5 kts
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
162
Moderate — a good balance of speed and load-carrying ability.
Comfort Ratio
26.5
Acceptable coastal comfort — fine for weekends, notice the chop offshore.
Capsize Screening
1.94
Below the 2.0 offshore threshold — acceptable for ocean passages.
Hull Speed
8.5kts
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
26.5
Acceptable coastal comfort — fine for weekends, notice the chop offshore.
Under 20 — Snappy, racing motion
20–30 — Acceptable coastal
30–40 — Good offshore comfort
Over 40 — Very comfortable offshore
Capsize Screening Formula
1.94
Below the 2.0 offshore threshold — acceptable for ocean passages.
Under 2.0 — Acceptable for offshore
Over 2.0 — Coastal / protected waters
How It Compares
Side-by-side with the boats most often cross-shopped against the Saturn 47.
| Saturn 47 | Boreal 44 | Bowman 45 | Caliber 45 | Irwin 43 Cc Mkii | Moody 45 Ds | |
|---|---|---|---|---|---|---|
| Dimensions | ||||||
| LOA | 45.3 | 45.3 | 45.2 | 45.0 | 45.5 | 45.0 |
| LWL | 40.6 | 38.2 | 36.6 | 35.8 | 35.5 | 42.4 |
| Beam | 14.0 | 14.1 | 13.0 | 13.3 | 13.6 | 15.0 |
| Displacement | 24 | 22 | 24 | 29 | 26 | 29 |
| Ballast | — | 8 | 9 | 12 | 8 | 9 |
| Sail Area | — | 1 | 1 | 940 | 1 | 1 |
| Performance | ||||||
| SA/Disp | — | 21.6 | 20.9 | 16.0 | 18.7 | 17.6 |
| Bal/Disp | — | 36.9 | 37.8 | 41.4 | 30.8 | — |
| Comfort | 26.5 | 25.6 | 31.8 | 36.9 | 32.4 | 29.2 |
| Capsize | 1.94 | 2.00 | 1.79 | 1.74 | 1.84 | 1.93 |
| Hull Speed | 8.5 | 8.3 | 8.1 | 8.0 | 8.0 | 8.7 |