The J80 is aggressively canvassed for its weight, with a quick, snappy motion best suited to day sailing.
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 22.0′, the J80 tops out around 6.3 knots in displacement mode — after that, the bow wave outruns the hull and resistance climbs steeply.
1.34 × √22.0′ 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.
SA / Displacement
26.7
Performance-oriented — carries a lot of canvas for its weight.
Ballast / Displacement
48.3%
Race-oriented ballast ratio — very stiff and powerful.
Displacement / Length
122
Ultralight — responsive and fast, but carries less stores.
Comfort Ratio
11.6
Quick, snappy motion — better for day sails and racing than long passages.
Capsize Screening
2.32
Above the 2.0 offshore threshold — best suited for coastal and protected waters.
Pounds/Inch Immersion
649lbs
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
11.6
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
2.32
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 J80 sits on the PHRF handicap spectrum — lower numbers mean faster boats.
Racer 0–90
Cruiser/Racer 90–150
Cruiser 150–210
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 |
3.7 |
4.2 |
4.4 |
| Close Reach60° |
3.6 |
4.5 |
5.1 |
5.3 |
| Beam Reach90° |
4.4 |
5.6 |
6.2 |
6.7 |
| Broad Reach120–135° |
4.1 |
5.1 |
5.7 |
6.2 |
| Run150–180° |
3.2 |
4.1 |
4.6 |
4.8 |
These are simplified estimates based on hull speed (6.3 kts),
SA/D (26.7), 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 J80 — based on sail area, ballast, and displacement characteristics.
Ghost
Sweet Spot
Reef
Heavy
0–5 kts
5–18 kts
18–28 kts
28+ kts
Ghosting
0–5 kts
Light air, motor-sailing likely. Need patience and a light genoa.
Sweet Spot
5–18 kts
Comfortable under full sail. Best speed-to-comfort ratio.
Time to Reef
18–28 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 J80.
|
J80 |
8M One Design |
Cork 1720 |
Firebird |
Pearson 26 One Design |
Sonata 26 |
| Dimensions |
| LOA |
26.3 |
26.3 |
26.3 |
26.3 |
26.2 |
26.3 |
| LWL |
22.0 |
22.9 |
23.3 |
25.0 |
21.7 |
19.8 |
| Beam |
8.3 |
8.2 |
8.2 |
17.3 |
8.7 |
8.2 |
| Displacement |
2 |
2 |
3 |
1 |
5 |
2 |
| Ballast |
1 |
925 |
1 |
— |
2 |
500 |
| Sail Area |
338 |
452 |
358 |
382 |
321 |
277 |
| Performance |
| PHRF |
— |
— |
96 |
— |
— |
— |
| SA/Disp |
26.7 |
40.2 |
27.6 |
61.2 |
17.2 |
22.3 |
| Bal/Disp |
48.3 |
— |
46.3 |
— |
42.3 |
— |
| Comfort |
11.6 |
9.5 |
11.7 |
— |
19.7 |
12.2 |
| Capsize |
2.32 |
2.44 |
2.27 |
— |
2.00 |
2.32 |
| Hull Speed |
6.3 |
6.4 |
6.5 |
— |
6.2 |
6.0 |