The Islander 28 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 23.1′, the Islander 28 tops out around 6.4 knots in displacement mode — after that, the bow wave outruns the hull and resistance climbs steeply.
1.34 × √23.1′ LWL = 6.4 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
15.8
Moderate sail power — a capable coastal cruiser, not overpowered.
Ballast / Displacement
42.9%
Stiff enough to carry a big genoa comfortably into moderate breeze.
Displacement / Length
254
Moderate-heavy — carries provisions well, deliberate in light air.
Comfort Ratio
21.0
Acceptable coastal comfort — fine for weekends, notice the chop offshore.
Capsize Screening
2.06
Above the 2.0 offshore threshold — best suited for coastal and protected waters.
Pounds/Inch Immersion
811lbs
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
21.0
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
2.06
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 Islander 28 sits on the PHRF handicap spectrum — lower numbers mean faster boats.
Cruiser/Racer 90–150
Cruiser 150–210
Heavy Cruiser 210–300
Islander 28
186s/nm
Typical cruiser — designed for comfort and ease, not podium finishes.
Aloha 28
195s/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° |
2.5 |
3.1 |
3.5 |
3.6 |
| Close Reach60° |
3.0 |
3.8 |
4.2 |
4.4 |
| Beam Reach90° |
3.7 |
4.6 |
5.2 |
5.4 |
| Broad Reach120–135° |
3.4 |
4.3 |
4.8 |
5.0 |
| Run150–180° |
2.7 |
3.4 |
3.8 |
4.0 |
These are simplified estimates based on hull speed (6.4 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 Islander 28 — based on sail area, ballast, and displacement characteristics.
Ghost
Sweet Spot
Reef
Heavy
0–7 kts
7–22 kts
22–32 kts
32+ kts
Ghosting
0–7 kts
Light air, motor-sailing likely. Need patience and a light genoa.
Sweet Spot
7–22 kts
Comfortable under full sail. Best speed-to-comfort ratio.
Time to Reef
22–32 kts
Time to shorten sail. Reef the main, swap to a working jib.
Heavy Weather
32+ 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 Islander 28.
|
Islander 28 |
Aloha 28 |
Bahama 28 Islander |
Cc 27 Mk Iii |
Mirage 27 Perry |
S2 86 |
| Dimensions |
| LOA |
27.9 |
28.0 |
27.9 |
27.9 |
27.9 |
28.0 |
| LWL |
23.1 |
24.5 |
23.1 |
22.9 |
21.7 |
22.5 |
| Beam |
9.8 |
9.4 |
9.8 |
9.2 |
9.3 |
9.5 |
| Displacement |
7 |
6 |
7 |
5 |
5 |
7 |
| Ballast |
3 |
3 |
3 |
2 |
2 |
3 |
| Sail Area |
361 |
373 |
361 |
344 |
313 |
390 |
| Performance |
| PHRF |
186 |
195 |
— |
— |
— |
— |
| SA/Disp |
15.8 |
16.8 |
15.8 |
17.7 |
16.7 |
16.2 |
| Bal/Disp |
42.9 |
44.4 |
42.9 |
— |
42.3 |
— |
| Comfort |
21.0 |
20.6 |
21.0 |
18.3 |
17.6 |
24.2 |
| Capsize |
2.06 |
2.00 |
2.06 |
2.08 |
2.14 |
1.94 |
| Hull Speed |
6.4 |
6.6 |
6.4 |
6.4 |
6.2 |
6.4 |