The Ericson 381 is well-powered with enough sail area to move in light air, with acceptable motion comfort for coastal passages, and respectable in club racing.
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 30.5′, the Ericson 381 tops out around 7.4 knots in displacement mode — after that, the bow wave outruns the hull and resistance climbs steeply.
1.34 × √30.5′ LWL = 7.4 kts
Performance Ratios
Racing handicap, sail-carrying power, stability and comfort — and what each one actually tells you about a day on the water.
PHRF Rating
114s/nm
Cruiser/racer — competitive in club racing, comfortable cruising.
SA / Displacement
18.4
Powerful cruiser/racer — quick in light air, reef early when it pipes up.
Ballast / Displacement
43.8%
Stiff enough to carry a big genoa comfortably into moderate breeze.
Displacement / Length
227
Moderate — a good balance of speed and load-carrying ability.
Comfort Ratio
24.9
Acceptable coastal comfort — fine for weekends, notice the chop offshore.
Capsize Screening
1.98
Below the 2.0 offshore threshold — acceptable for ocean passages.
Pounds/Inch Immersion
1lbs
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
1.98
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 Ericson 381 sits on the PHRF handicap spectrum — lower numbers mean faster boats.
Racer 0–90
Cruiser/Racer 90–150
Cruiser 150–210
Pearson 37 2
102s/nm
Ericson 381
114s/nm
Cruiser/racer — competitive in club racing, comfortable cruising.
Nantucket Island 38
171s/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° |
3.1 |
3.9 |
4.3 |
4.5 |
| Close Reach60° |
3.7 |
4.7 |
5.2 |
5.5 |
| Beam Reach90° |
4.5 |
5.7 |
6.4 |
6.7 |
| Broad Reach120–135° |
4.2 |
5.3 |
5.9 |
6.2 |
| Run150–180° |
3.4 |
4.2 |
4.7 |
4.9 |
These are simplified estimates based on hull speed (7.4 kts),
SA/D (18.4), 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 Ericson 381 — based on sail area, ballast, and displacement characteristics.
Ghost
Sweet Spot
Reef
Heavy
0–6 kts
6–20 kts
20–30 kts
30+ kts
Ghosting
0–6 kts
Light air, motor-sailing likely. Need patience and a light genoa.
Sweet Spot
6–20 kts
Comfortable under full sail. Best speed-to-comfort ratio.
Time to Reef
20–30 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 Ericson 381.
|
Ericson 381 |
Cc 37 |
Cc 38 3 |
Landfall 38 Cc |
Nantucket Island 38 |
Pearson 37 2 |
| Dimensions |
| LOA |
37.5 |
37.6 |
37.6 |
37.6 |
37.6 |
37.4 |
| LWL |
30.5 |
28.8 |
31.0 |
30.2 |
31.8 |
29.6 |
| Beam |
12.0 |
11.7 |
12.8 |
12.0 |
12.1 |
12.3 |
| Displacement |
14 |
14 |
14 |
16 |
20 |
16 |
| Ballast |
6 |
6 |
6 |
6 |
8 |
6 |
| Sail Area |
678 |
670 |
729 |
648 |
681 |
661 |
| Performance |
| PHRF |
114 |
— |
— |
— |
171 |
102 |
| SA/Disp |
18.4 |
18.3 |
19.9 |
15.9 |
14.8 |
16.7 |
| Bal/Disp |
43.8 |
42.0 |
43.8 |
38.9 |
41.5 |
37.5 |
| Comfort |
24.9 |
26.7 |
22.4 |
29.1 |
33.3 |
27.3 |
| Capsize |
1.98 |
1.93 |
2.11 |
1.88 |
1.79 |
1.96 |
| Hull Speed |
7.4 |
7.2 |
7.5 |
7.4 |
7.6 |
7.3 |