The Seaward 46Rk is well-powered with enough sail area to move in light air, with acceptable motion comfort for coastal passages.
Hull Speed
The theoretical displacement-mode speed limit — determined by waterline length, not engine or sail power.
A displacement hull pushes a bow wave whose speed is limited by the waterline length.
With a waterline of 44.8′, the Seaward 46Rk tops out around 9.0 knots in displacement mode — after that, the bow wave outruns the hull and resistance climbs steeply.
1.34 × √44.8′ LWL = 9.0 kts
Performance Ratios
Racing handicap, sail-carrying power, stability and comfort — and what each one actually tells you about a day on the water.
SA / Displacement
20.0
Powerful cruiser/racer — quick in light air, reef early when it pipes up.
Ballast / Displacement
32.6%
Typical cruising ballast — balanced stability and motion underway.
Displacement / Length
114
Ultralight — responsive and fast, but carries less stores.
Comfort Ratio
24.9
Acceptable coastal comfort — fine for weekends, notice the chop offshore.
Capsize Screening
1.87
Below the 2.0 offshore threshold — acceptable for ocean passages.
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
24.9
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
1.87
Below the 2.0 offshore threshold — acceptable for ocean passages.
Under 2.0 — Acceptable for offshore
Over 2.0 — Coastal / protected waters
PHRF Fleet Position
Where the Seaward 46Rk sits on the PHRF handicap spectrum — lower numbers mean faster boats.
Racer 0–90
Cruiser/Racer 90–150
Estimated Speed by Wind
Rough boat speed estimates at different true wind speeds and points of sail — derived from hull speed, SA/D, and displacement, not measured polars.
| Point of Sail |
6 kts TWS |
10 kts TWS |
15 kts TWS |
20 kts TWS |
| Close-hauled40–50° |
3.9 |
4.9 |
5.5 |
5.7 |
| Close Reach60° |
4.7 |
5.9 |
6.6 |
6.9 |
| Beam Reach90° |
5.7 |
7.3 |
8.1 |
8.8 |
| Broad Reach120–135° |
5.3 |
6.7 |
7.5 |
8.1 |
| Run150–180° |
4.2 |
5.4 |
6.0 |
6.3 |
These are simplified estimates based on hull speed (9.0 kts),
SA/D (20.0), and empirical efficiency curves — not instrument-measured
polars. Real-world speed varies with sea state, bottom condition, sail trim, and current.
Speeds in gold approach hull speed;
bold gold means near or at hull speed.
Wind Range & Comfort Envelope
Estimated wind ranges for comfortable sailing on the Seaward 46Rk — based on sail area, ballast, and displacement characteristics.
Ghost
Sweet Spot
Reef
Heavy
0–6 kts
6–18 kts
18–26 kts
26+ kts
Ghosting
0–6 kts
Light air, motor-sailing likely. Need patience and a light genoa.
Sweet Spot
6–18 kts
Comfortable under full sail. Best speed-to-comfort ratio.
Time to Reef
18–26 kts
Time to shorten sail. Reef the main, swap to a working jib.
Heavy Weather
26+ kts
Storm conditions. Storm jib or bare poles. Seek shelter if coastal.
How It Compares
Side-by-side with the boats most often cross-shopped against the Seaward 46Rk.
|
Seaward 46Rk |
Dufour 48 Prestige |
J/145 |
Malo 47 |
Oceanis 46.1 Beneteau |
X 482 |
| Dimensions |
| LOA |
48.0 |
48.0 |
47.9 |
48.1 |
47.9 |
48.0 |
| LWL |
44.8 |
42.0 |
41.0 |
38.2 |
41.3 |
41.0 |
| Beam |
13.3 |
15.2 |
14.2 |
13.5 |
15.1 |
14.1 |
| Displacement |
23 |
29 |
26 |
31 |
29 |
26 |
| Ballast |
7 |
9 |
11 |
12 |
10 |
11 |
| Sail Area |
1 |
1 |
1,020 |
1 |
1,120 |
1 |
| Performance |
| PHRF |
— |
— |
— |
— |
— |
15 |
| SA/Disp |
20.0 |
21.6 |
16.5 |
21.3 |
18.7 |
20.8 |
| Bal/Disp |
32.6 |
31.9 |
42.3 |
— |
34.3 |
— |
| Comfort |
24.9 |
28.1 |
35.9 |
36.4 |
28.2 |
28.0 |
| Capsize |
1.87 |
1.96 |
1.54 |
1.72 |
1.96 |
1.89 |
| Hull Speed |
9.0 |
8.7 |
11.0 |
8.3 |
8.6 |
8.6 |