The San Juan 28 is well-powered with enough sail area to move in light air, with a quick, snappy motion best suited to day sailing, designed for cruising comfort rather than 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 22.3′, the San Juan 28 tops out around 6.3 knots in displacement mode — after that, the bow wave outruns the hull and resistance climbs steeply.
1.34 × √22.3′ LWL = 6.3 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
186s/nm
Typical cruiser — designed for comfort and ease, not podium finishes.
SA / Displacement
18.3
Powerful cruiser/racer — quick in light air, reef early when it pipes up.
Ballast / Displacement
50.0%
Race-oriented ballast ratio — very stiff and powerful.
Displacement / Length
249
Moderate — a good balance of speed and load-carrying ability.
Comfort Ratio
18.4
Quick, snappy motion — better for day sails and racing than long passages.
Capsize Screening
2.18
Above the 2.0 offshore threshold — best suited for coastal and protected waters.
Pounds/Inch Immersion
798lbs
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
18.4
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
2.18
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 San Juan 28 sits on the PHRF handicap spectrum — lower numbers mean faster boats.
Cruiser/Racer 90–150
Cruiser 150–210
Heavy Cruiser 210–300
San Juan 28
186s/nm
Typical cruiser — designed for comfort and ease, not podium finishes.
Lancer 29 3
194s/nm
Ontario 28
195s/nm
Ericson 29
210s/nm
Seafarer 29
210s/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 |
3.9 |
| Close Reach60° |
3.2 |
4.0 |
4.5 |
4.7 |
| Beam Reach90° |
3.9 |
4.9 |
5.5 |
5.7 |
| Broad Reach120–135° |
3.6 |
4.5 |
5.1 |
5.3 |
| Run150–180° |
2.9 |
3.6 |
4.0 |
4.2 |
These are simplified estimates based on hull speed (6.3 kts),
SA/D (18.3), 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 San Juan 28 — 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 San Juan 28.
|
San Juan 28 |
Columbia 87 |
Ericson 29 |
Lancer 29 3 |
Ontario 28 |
Seafarer 29 |
| Dimensions |
| LOA |
28.7 |
28.6 |
28.6 |
28.7 |
28.6 |
28.7 |
| LWL |
22.3 |
23.2 |
22.0 |
23.5 |
22.0 |
21.3 |
| Beam |
10.0 |
10.0 |
9.3 |
10.0 |
10.0 |
9.0 |
| Displacement |
6 |
8 |
8 |
7 |
6 |
6 |
| Ballast |
3 |
3 |
3 |
3 |
2 |
2 |
| Sail Area |
385 |
416 |
436 |
374 |
400 |
357 |
| Performance |
| PHRF |
186 |
— |
210 |
194 |
195 |
210 |
| SA/Disp |
18.3 |
16.0 |
16.8 |
15.3 |
17.9 |
16.3 |
| Bal/Disp |
50.0 |
41.2 |
45.9 |
38.5 |
42.7 |
— |
| Comfort |
18.4 |
24.7 |
28.3 |
22.4 |
20.4 |
23.3 |
| Capsize |
2.18 |
1.96 |
1.82 |
2.02 |
2.11 |
1.92 |
| Hull Speed |
6.3 |
6.5 |
6.3 |
6.5 |
6.3 |
6.2 |