The Kelley 34 is well-powered with enough sail area to move in light air, 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 27.5′, the Kelley 34 tops out around 7.0 knots in displacement mode — after that, the bow wave outruns the hull and resistance climbs steeply.
1.34 × √27.5′ LWL = 7.0 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
18.4
Powerful cruiser/racer — quick in light air, reef early when it pipes up.
Ballast / Displacement
41.4%
Stiff enough to carry a big genoa comfortably into moderate breeze.
Displacement / Length
218
Moderate — a good balance of speed and load-carrying ability.
Comfort Ratio
21.5
Acceptable coastal comfort — fine for weekends, notice the chop offshore.
Capsize Screening
2.07
Above the 2.0 offshore threshold — best suited for coastal and protected waters.
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
21.5
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
2.07
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 Kelley 34 sits on the PHRF handicap spectrum — lower numbers mean faster boats.
Racer 0–90
Cruiser/Racer 90–150
Cruiser 150–210
Peterson 34
120s/nm
San Juan 34
132s/nm
Pearson 34
144s/nm
Tartan 33
153s/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° |
2.9 |
3.7 |
4.1 |
4.3 |
| Close Reach60° |
3.5 |
4.5 |
5.0 |
5.2 |
| Beam Reach90° |
4.3 |
5.5 |
6.1 |
6.4 |
| Broad Reach120–135° |
4.0 |
5.0 |
5.6 |
5.9 |
| Run150–180° |
3.2 |
4.0 |
4.5 |
4.7 |
These are simplified estimates based on hull speed (7.0 kts),
SA/D (18.4), 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 Kelley 34 — based on sail area, ballast, and displacement characteristics.
Ghost
Sweet Spot
Reef
Heavy
0–6 kts
6–20 kts
20–30 kts
30+ kts
Ghosting
0–6 kts
Light air, motor-sailing likely. Need patience and a light genoa.
Sweet Spot
6–20 kts
Comfortable under full sail. Best speed-to-comfort ratio.
Time to Reef
20–30 kts
Time to shorten sail. Reef the main, swap to a working jib.
Heavy Weather
30+ 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 Kelley 34.
|
Kelley 34 |
Pearson 34 |
Peterson 34 |
S2 103 |
San Juan 34 |
Tartan 33 |
| Dimensions |
| LOA |
33.8 |
33.8 |
33.9 |
33.8 |
33.8 |
33.7 |
| LWL |
27.5 |
28.1 |
28.3 |
28.0 |
27.9 |
28.8 |
| Beam |
11.2 |
11.2 |
11.3 |
11.3 |
10.9 |
11.0 |
| Displacement |
10 |
11 |
10 |
10 |
10 |
10 |
| Ballast |
4 |
4 |
5 |
4 |
4 |
4 |
| Sail Area |
538 |
550 |
565 |
564 |
548 |
531 |
| Performance |
| PHRF |
— |
144 |
120 |
— |
132 |
153 |
| SA/Disp |
18.4 |
17.6 |
18.6 |
18.9 |
18.4 |
18.4 |
| Bal/Disp |
41.4 |
— |
47.2 |
— |
45.7 |
— |
| Comfort |
21.5 |
23.4 |
22.2 |
21.5 |
22.6 |
21.0 |
| Capsize |
2.07 |
2.00 |
2.04 |
2.07 |
2.00 |
2.04 |
| Hull Speed |
7.0 |
7.1 |
7.1 |
7.1 |
7.1 |
7.2 |