The Sirius 28 Can is moderately powered for comfortable coastal cruising, with acceptable motion comfort for coastal passages, 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 24.0′, the Sirius 28 Can tops out around 6.6 knots in displacement mode — after that, the bow wave outruns the hull and resistance climbs steeply.
1.34 × √24.0′ LWL = 6.6 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
188s/nm
Typical cruiser — designed for comfort and ease, not podium finishes.
SA / Displacement
17.1
Moderate sail power — a capable coastal cruiser, not overpowered.
Comfort Ratio
20.0
Acceptable coastal comfort — fine for weekends, notice the chop offshore.
Capsize Screening
2.05
Above the 2.0 offshore threshold — best suited for coastal and protected waters.
Pounds/Inch Immersion
829lbs
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
20.0
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
2.05
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 Sirius 28 Can sits on the PHRF handicap spectrum — lower numbers mean faster boats.
Cruiser/Racer 90–150
Cruiser 150–210
Heavy Cruiser 210–300
Sirius 28 Can
188s/nm
Typical cruiser — designed for comfort and ease, not podium finishes.
Aloha 28
195s/nm
Comet 860
240s/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 |
4.1 |
4.2 |
These are simplified estimates based on hull speed (6.6 kts),
SA/D (17.1), 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 Sirius 28 Can — 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 Sirius 28 Can.
|
Sirius 28 Can |
Aloha 28 |
Comet 860 |
Ericson 28 2 |
S2 86 |
Spirit 28 Finch |
| Dimensions |
| LOA |
28.0 |
28.0 |
28.0 |
28.0 |
28.0 |
28.0 |
| LWL |
24.0 |
24.5 |
22.3 |
23.3 |
22.5 |
23.0 |
| Beam |
9.7 |
9.4 |
9.7 |
10.0 |
9.5 |
10.0 |
| Displacement |
6 |
6 |
6 |
7 |
7 |
6 |
| Ballast |
2 |
3 |
2 |
3 |
3 |
2 |
| Sail Area |
379 |
373 |
474 |
411 |
390 |
365 |
| Performance |
| PHRF |
188 |
195 |
240 |
— |
— |
— |
| SA/Disp |
17.1 |
16.8 |
21.6 |
17.2 |
16.2 |
16.2 |
| Bal/Disp |
— |
44.4 |
32.0 |
42.7 |
— |
42.0 |
| Comfort |
20.0 |
20.6 |
20.7 |
21.8 |
24.2 |
20.3 |
| Capsize |
2.05 |
2.00 |
2.07 |
2.05 |
1.94 |
2.10 |
| Hull Speed |
6.6 |
6.6 |
6.3 |
6.5 |
6.4 |
6.4 |