The Bosco is moderately powered for comfortable coastal cruising, with a quick, snappy motion best suited to day sailing.
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.
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
15.8
Moderate sail power — a capable coastal cruiser, not overpowered.
Ballast / Displacement
37.3%
Typical cruising ballast — balanced stability and motion underway.
Displacement / Length
249
Moderate — a good balance of speed and load-carrying ability.
Comfort Ratio
14.3
Quick, snappy motion — better for day sails and racing than long passages.
Capsize Screening
2.30
Above the 2.0 offshore threshold — best suited for coastal and protected waters.
Pounds/Inch Immersion
3lbs
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
14.3
Quick, snappy motion — better for day sails and racing than long passages.
Under 20 — Snappy, racing motion
20–30 — Acceptable coastal
30–40 — Good offshore comfort
Over 40 — Very comfortable offshore
Capsize Screening Formula
2.30
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
PHRF Fleet Position
Where the Bosco sits on the PHRF handicap spectrum — lower numbers mean faster boats.
Cruiser 150–210
Heavy Cruiser 210–300
Rhodes 19
261s/nm
Montego 19
288s/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° |
2.1 |
2.6 |
2.9 |
3.1 |
| Close Reach60° |
2.5 |
3.2 |
3.6 |
3.7 |
| Beam Reach90° |
3.1 |
3.9 |
4.4 |
4.5 |
| Broad Reach120–135° |
2.8 |
3.6 |
4.0 |
4.2 |
| Run150–180° |
2.3 |
2.9 |
3.2 |
3.4 |
These are simplified estimates based on hull speed (5.4 kts),
SA/D (15.8), 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 Bosco — based on sail area, ballast, and displacement characteristics.
Ghost
Sweet Spot
Reef
Heavy
0–7 kts
7–20 kts
20–28 kts
28+ kts
Ghosting
0–7 kts
Light air, motor-sailing likely. Need patience and a light genoa.
Sweet Spot
7–20 kts
Comfortable under full sail. Best speed-to-comfort ratio.
Time to Reef
20–28 kts
Time to shorten sail. Reef the main, swap to a working jib.
Heavy Weather
28+ 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 Bosco.
|
Bosco |
Com Pac 19 |
Corinthian 19 Alberg |
Mariner 19 Fk |
Montego 19 |
Rhodes 19 |
| Dimensions |
| LOA |
19.2 |
19.0 |
19.5 |
19.2 |
19.5 |
19.2 |
| LWL |
— |
16.3 |
14.5 |
17.8 |
17.8 |
17.8 |
| Beam |
7.7 |
7.0 |
6.5 |
7.0 |
7.2 |
7.0 |
| Displacement |
2 |
2 |
2 |
1 |
1 |
1 |
| Ballast |
904 |
800 |
1 |
— |
— |
415 |
| Sail Area |
177 |
145 |
193 |
184 |
167 |
175 |
| Performance |
| PHRF |
— |
— |
— |
— |
288 |
261 |
| SA/Disp |
15.8 |
14.7 |
15.9 |
23.2 |
20.0 |
22.9 |
| Bal/Disp |
37.3 |
40.0 |
40.4 |
— |
— |
— |
| Comfort |
14.3 |
13.5 |
21.7 |
9.1 |
9.5 |
8.6 |
| Capsize |
2.30 |
2.22 |
1.86 |
2.49 |
2.48 |
2.53 |
| Hull Speed |
5.4 |
5.4 |
5.1 |
5.7 |
5.7 |
5.7 |