The Islander 36 is moderately powered for comfortable coastal cruising, with acceptable motion comfort for coastal passages, and respectable in club 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 28.3′, the Islander 36 tops out around 7.1 knots in displacement mode — after that, the bow wave outruns the hull and resistance climbs steeply.
1.34 × √28.3′ LWL = 7.1 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
144s/nm
Cruiser/racer — competitive in club racing, comfortable cruising.
SA / Displacement
16.4
Moderate sail power — a capable coastal cruiser, not overpowered.
Comfort Ratio
27.3
Acceptable coastal comfort — fine for weekends, notice the chop offshore.
Capsize Screening
1.88
Below the 2.0 offshore threshold — acceptable for ocean passages.
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
27.3
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
1.88
Below the 2.0 offshore threshold — acceptable for ocean passages.
Under 2.0 — Acceptable for offshore
Over 2.0 — Coastal / protected waters
PHRF Fleet Position
Where the Islander 36 sits on the PHRF handicap spectrum — lower numbers mean faster boats.
Racer 0–90
Cruiser/Racer 90–150
Cruiser 150–210
Islander 36
144s/nm
Cruiser/racer — competitive in club racing, comfortable cruising.
Cape Dory 36
165s/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° |
2.8 |
3.5 |
3.9 |
4.1 |
| Close Reach60° |
3.4 |
4.3 |
4.8 |
5.0 |
| Beam Reach90° |
4.1 |
5.2 |
5.8 |
6.1 |
| Broad Reach120–135° |
3.8 |
4.8 |
5.4 |
5.6 |
| Run150–180° |
3.1 |
3.9 |
4.3 |
4.5 |
These are simplified estimates based on hull speed (7.1 kts),
SA/D (16.4), 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 36 — 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 Islander 36.
|
Islander 36 |
Cape Dory 36 |
Cavalier 36 |
Peterson 36 |
Sigma 36 Thomas |
Sweden Yachts 36 |
| Dimensions |
| LOA |
36.1 |
36.1 |
36.1 |
36.1 |
36.0 |
36.1 |
| LWL |
28.3 |
27.0 |
29.9 |
31.5 |
28.8 |
29.5 |
| Beam |
11.2 |
10.7 |
11.8 |
10.5 |
11.5 |
12.0 |
| Displacement |
13 |
16 |
14 |
16 |
12 |
14 |
| Ballast |
5 |
6 |
7 |
6 |
— |
5 |
| Sail Area |
576 |
622 |
858 |
— |
605 |
— |
| Performance |
| PHRF |
144 |
165 |
— |
— |
— |
— |
| SA/Disp |
16.4 |
15.7 |
23.2 |
— |
18.2 |
— |
| Bal/Disp |
— |
37.6 |
51.7 |
37.5 |
— |
41.6 |
| Comfort |
27.3 |
35.7 |
26.4 |
— |
23.9 |
— |
| Capsize |
1.88 |
1.69 |
1.94 |
— |
1.99 |
— |
| Hull Speed |
7.1 |
7.0 |
7.3 |
— |
7.2 |
— |