The Cb 365 is aggressively canvassed for its weight, 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 32.8′, the Cb 365 tops out around 7.7 knots in displacement mode — after that, the bow wave outruns the hull and resistance climbs steeply.
1.34 × √32.8′ LWL = 7.7 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
26.2
Performance-oriented — carries a lot of canvas for its weight.
Comfort Ratio
20.4
Acceptable coastal comfort — fine for weekends, notice the chop offshore.
Capsize Screening
2.00
Above the 2.0 offshore threshold — best suited for coastal and protected waters.
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
20.4
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
2.00
Above the 2.0 offshore threshold — best suited for coastal and protected waters.
Under 2.0 — Acceptable for offshore
Over 2.0 — Coastal / protected waters
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 |
4.6 |
5.1 |
5.3 |
| Close Reach60° |
4.4 |
5.5 |
6.2 |
6.4 |
| Beam Reach90° |
5.4 |
6.8 |
7.6 |
7.7 |
| Broad Reach120–135° |
5.0 |
6.3 |
7.0 |
7.3 |
| Run150–180° |
4.0 |
5.0 |
5.6 |
5.8 |
These are simplified estimates based on hull speed (7.7 kts),
SA/D (26.2), 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 Cb 365 — based on sail area, ballast, and displacement characteristics.
Ghost
Sweet Spot
Reef
Heavy
0–5 kts
5–16 kts
16–24 kts
24+ kts
Ghosting
0–5 kts
Light air, motor-sailing likely. Need patience and a light genoa.
Sweet Spot
5–16 kts
Comfortable under full sail. Best speed-to-comfort ratio.
Time to Reef
16–24 kts
Time to shorten sail. Reef the main, swap to a working jib.
Heavy Weather
24+ 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 Cb 365.
|
Cb 365 |
Cc 110 |
Cr 360 370 |
Feeling 36 |
J/111 |
Sun Fast 36 Jeanneau |
| Dimensions |
| LOA |
36.5 |
36.3 |
36.4 |
36.4 |
36.5 |
36.4 |
| LWL |
32.8 |
31.5 |
32.0 |
32.5 |
31.0 |
31.5 |
| Beam |
11.1 |
12.0 |
11.9 |
11.9 |
11.6 |
12.1 |
| Displacement |
11 |
10 |
14 |
13 |
11 |
11 |
| Ballast |
3 |
4 |
6 |
4 |
5 |
4 |
| Sail Area |
807 |
706 |
— |
736 |
672 |
688 |
| Performance |
| SA/Disp |
26.2 |
23.1 |
— |
20.7 |
20.4 |
21.3 |
| Bal/Disp |
— |
— |
43.0 |
31.9 |
45.5 |
39.6 |
| Comfort |
20.4 |
18.7 |
— |
23.2 |
26.7 |
19.6 |
| Capsize |
2.00 |
2.17 |
— |
1.99 |
1.62 |
2.14 |
| Hull Speed |
7.7 |
7.5 |
— |
7.6 |
8.8 |
7.5 |