The Vulcan 34 Westerly is moderately powered for comfortable coastal cruising, with a steady, comfortable ride offshore.
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 28.4′, the Vulcan 34 Westerly tops out around 7.1 knots in displacement mode — after that, the bow wave outruns the hull and resistance climbs steeply.
1.34 × √28.4′ 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.
SA / Displacement
14.7
Moderate sail power — a capable coastal cruiser, not overpowered.
Ballast / Displacement
44.7%
Stiff enough to carry a big genoa comfortably into moderate breeze.
Displacement / Length
303
Moderate-heavy — carries provisions well, deliberate in light air.
Comfort Ratio
30.1
Good offshore comfort — steady enough for multi-day passages.
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
30.1
Good offshore comfort — steady enough for multi-day passages.
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 Vulcan 34 Westerly sits on the PHRF handicap spectrum — lower numbers mean faster boats.
Cruiser/Racer 90–150
Cruiser 150–210
Heavy Cruiser 210–300
Catalina 34
150s/nm
Oday 34
153s/nm
Contest 34
186s/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° |
2.7 |
3.4 |
3.7 |
3.9 |
| Close Reach60° |
3.2 |
4.1 |
4.5 |
4.7 |
| Beam Reach90° |
3.9 |
5.0 |
5.6 |
5.8 |
| Broad Reach120–135° |
3.6 |
4.6 |
5.1 |
5.4 |
| Run150–180° |
2.9 |
3.7 |
4.1 |
4.3 |
These are simplified estimates based on hull speed (7.1 kts),
SA/D (14.7), 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 Vulcan 34 Westerly — 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 Vulcan 34 Westerly.
|
Vulcan 34 Westerly |
Catalina 34 |
Contest 34 |
Gk 34 Westerly |
Oday 34 |
Rival 34 |
| Dimensions |
| LOA |
34.0 |
34.0 |
34.0 |
34.0 |
34.0 |
34.0 |
| LWL |
28.4 |
29.3 |
27.6 |
27.7 |
28.8 |
24.8 |
| Beam |
11.8 |
11.9 |
11.2 |
11.3 |
11.3 |
9.7 |
| Displacement |
15 |
11 |
16 |
8 |
11 |
11 |
| Ballast |
6 |
5 |
7 |
4 |
4 |
4 |
| Sail Area |
570 |
514 |
484 |
512 |
524 |
— |
| Performance |
| PHRF |
— |
150 |
186 |
— |
153 |
— |
| SA/Disp |
14.7 |
15.7 |
12.1 |
19.9 |
16.5 |
— |
| Bal/Disp |
44.7 |
41.8 |
43.2 |
54.8 |
— |
39.5 |
| Comfort |
30.1 |
22.0 |
34.4 |
17.5 |
23.3 |
— |
| Capsize |
1.88 |
2.09 |
1.76 |
2.22 |
2.00 |
— |
| Hull Speed |
7.1 |
7.3 |
7.0 |
7.1 |
7.2 |
— |