The Blue Jacket 40 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 35.0′, the Blue Jacket 40 tops out around 7.9 knots in displacement mode — after that, the bow wave outruns the hull and resistance climbs steeply.
1.34 × √35.0′ LWL = 7.9 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
90s/nm
Cruiser/racer — competitive in club racing, comfortable cruising.
SA / Displacement
21.9
Powerful cruiser/racer — quick in light air, reef early when it pipes up.
Ballast / Displacement
37.0%
Typical cruising ballast — balanced stability and motion underway.
Displacement / Length
172
Moderate — a good balance of speed and load-carrying ability.
Comfort Ratio
24.7
Acceptable coastal comfort — fine for weekends, notice the chop offshore.
Capsize Screening
1.94
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
24.7
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
PHRF Fleet Position
Where the Blue Jacket 40 sits on the PHRF handicap spectrum — lower numbers mean faster boats.
Racer 0–90
Cruiser/Racer 90–150
Cruiser 150–210
J/39
45s/nm
Blue Jacket 40
90s/nm
Cruiser/racer — competitive in club racing, comfortable cruising.
Swan 391
90s/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° |
3.6 |
4.5 |
5.1 |
5.3 |
| Close Reach60° |
4.4 |
5.5 |
6.1 |
6.4 |
| Beam Reach90° |
5.3 |
6.7 |
7.5 |
8.2 |
| Broad Reach120–135° |
4.9 |
6.2 |
7.0 |
7.6 |
| Run150–180° |
3.9 |
5.0 |
5.6 |
5.8 |
These are simplified estimates based on hull speed (7.9 kts),
SA/D (21.9), 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 Blue Jacket 40 — 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 Blue Jacket 40.
|
Blue Jacket 40 |
Catalina 386 |
Hanse 400 2008 2014 |
J/39 |
Jpk 1050 |
Swan 391 |
| Dimensions |
| LOA |
39.8 |
39.8 |
39.7 |
39.8 |
39.9 |
39.9 |
| LWL |
35.0 |
34.4 |
35.4 |
33.5 |
26.6 |
33.1 |
| Beam |
12.3 |
13.1 |
13.3 |
13.0 |
11.6 |
12.4 |
| Displacement |
16 |
17 |
18 |
16 |
7 |
18 |
| Ballast |
6 |
5 |
5 |
6 |
3 |
6 |
| Sail Area |
883 |
807 |
1 |
720 |
785 |
767 |
| Performance |
| PHRF |
90 |
— |
— |
45 |
— |
90 |
| SA/Disp |
21.9 |
19.0 |
26.1 |
16.9 |
32.3 |
17.4 |
| Bal/Disp |
37.0 |
29.2 |
32.0 |
39.4 |
— |
— |
| Comfort |
24.7 |
24.9 |
25.0 |
33.7 |
14.9 |
29.0 |
| Capsize |
1.94 |
2.01 |
2.01 |
1.61 |
2.35 |
1.87 |
| Hull Speed |
7.9 |
7.9 |
8.0 |
9.4 |
6.9 |
7.7 |