The Island Packet 36 is moderately powered for comfortable coastal cruising, with acceptable motion comfort for coastal passages.
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 31.0′, the Island Packet 36 tops out around 7.5 knots in displacement mode — after that, the bow wave outruns the hull and resistance climbs steeply.
1.34 × √31.0′ LWL = 7.5 kts
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
17.7
Moderate sail power — a capable coastal cruiser, not overpowered.
Ballast / Displacement
44.3%
Stiff enough to carry a big genoa comfortably into moderate breeze.
Displacement / Length
290
Moderate-heavy — carries provisions well, deliberate in light air.
Comfort Ratio
29.7
Acceptable coastal comfort — fine for weekends, notice the chop offshore.
Capsize Screening
1.88
Below the 2.0 offshore threshold — acceptable for ocean passages.
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
29.7
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 Island Packet 36 sits on the PHRF handicap spectrum — lower numbers mean faster boats.
Racer 0–90
Cruiser/Racer 90–150
Cruiser 150–210
Island Packet 40
141s/nm
Island Packet 38
162s/nm
Island Packet 37
168s/nm
Island Packet 35
180s/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° |
3.0 |
3.8 |
4.3 |
4.5 |
| Close Reach60° |
3.7 |
4.6 |
5.2 |
5.4 |
| Beam Reach90° |
4.5 |
5.7 |
6.3 |
6.6 |
| Broad Reach120–135° |
4.1 |
5.2 |
5.9 |
6.1 |
| Run150–180° |
3.3 |
4.2 |
4.7 |
4.9 |
These are simplified estimates based on hull speed (7.5 kts),
SA/D (17.7), 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 Island Packet 36 — 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 Island Packet 36.
|
Island Packet 36 |
Island Packet 35 |
Island Packet 37 |
Island Packet 38 |
Island Packet 40 |
| Dimensions |
| LOA |
38.6 |
35.3 |
38.6 |
38.0 |
40.0 |
| LWL |
31.0 |
30.0 |
31.0 |
33.0 |
34.0 |
| Beam |
12.2 |
12.0 |
12.2 |
12.7 |
12.9 |
| Displacement |
18 |
17 |
18 |
21 |
22 |
| Ballast |
8 |
8 |
8 |
10 |
10 |
| Sail Area |
797 |
640 |
800 |
870 |
907 |
| Performance |
| PHRF |
— |
180 |
168 |
162 |
141 |
| SA/Disp |
17.7 |
15.3 |
18.4 |
18.1 |
18.1 |
| Bal/Disp |
44.3 |
45.7 |
44.3 |
46.5 |
43.9 |
| Comfort |
29.7 |
31.3 |
30.9 |
32.7 |
32.6 |
| Capsize |
1.88 |
1.85 |
1.84 |
1.83 |
1.83 |
| Hull Speed |
7.5 |
7.3 |
7.5 |
7.7 |
7.8 |