The Island Trader 46 is modestly canvassed and unhurried, with a gentle bluewater motion.
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 39.8′, the Island Trader 46 tops out around 8.5 knots in displacement mode — after that, the bow wave outruns the hull and resistance climbs steeply.
1.34 × √39.8′ LWL = 8.4 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
7.8
Modestly canvassed — a comfortable, unhurried cruiser.
Comfort Ratio
48.2
Very comfortable in a seaway — a genuine bluewater motion.
Capsize Screening
1.67
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
48.2
Very comfortable in a seaway — a genuine bluewater motion.
Under 20 — Snappy, racing motion
20–30 — Acceptable coastal
30–40 — Good offshore comfort
Over 40 — Very comfortable offshore
Capsize Screening Formula
1.67
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 Island Trader 46 sits on the PHRF handicap spectrum — lower numbers mean faster boats.
Racer 0–90
Cruiser/Racer 90–150
Cruiser 150–210
Cape Dory 45
120s/nm
Morgan 45 Sj
123s/nm
Endeavour 43
132s/nm
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° |
2.6 |
3.3 |
3.7 |
3.8 |
| Close Reach60° |
3.1 |
4.0 |
4.4 |
4.6 |
| Beam Reach90° |
3.9 |
4.9 |
5.4 |
5.7 |
| Broad Reach120–135° |
3.6 |
4.5 |
5.0 |
5.2 |
| Run150–180° |
2.8 |
3.6 |
4.0 |
4.2 |
These are simplified estimates based on hull speed (8.5 kts),
SA/D (7.8), 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 Island Trader 46 — based on sail area, ballast, and displacement characteristics.
Ghost
Sweet Spot
Reef
Heavy
0–8 kts
8–22 kts
22–30 kts
30+ kts
Ghosting
0–8 kts
Light air, motor-sailing likely. Need patience and a light genoa.
Sweet Spot
8–22 kts
Comfortable under full sail. Best speed-to-comfort ratio.
Time to Reef
22–30 kts
Time to shorten sail. Reef the main, swap to a working jib.
Heavy Weather
30+ 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 Island Trader 46.
|
Island Trader 46 |
Bristol 455 |
Cape Dory 45 |
Endeavour 43 |
Morgan 45 Sj |
Oceanic 46 Brewer |
| Dimensions |
| LOA |
45.5 |
45.3 |
45.3 |
45.3 |
45.7 |
45.8 |
| LWL |
39.8 |
37.3 |
33.5 |
35.0 |
31.4 |
36.5 |
| Beam |
15.2 |
13.2 |
13.0 |
14.0 |
11.0 |
13.5 |
| Displacement |
48 |
34 |
24 |
33 |
25 |
33 |
| Ballast |
8 |
15 |
9 |
12 |
12 |
11 |
| Sail Area |
642 |
988 |
935 |
1,030 |
894 |
— |
| Performance |
| PHRF |
— |
— |
120 |
132 |
123 |
— |
| SA/Disp |
7.8 |
14.9 |
18.1 |
16.1 |
16.8 |
— |
| Bal/Disp |
— |
43.3 |
39.2 |
36.4 |
48.0 |
34.3 |
| Comfort |
48.2 |
43.7 |
32.9 |
39.9 |
44.4 |
— |
| Capsize |
1.67 |
1.62 |
1.81 |
1.75 |
1.51 |
— |
| Hull Speed |
8.5 |
8.2 |
7.8 |
7.9 |
7.5 |
— |