The Herreshoff 45 Cat Ketch is well-powered with enough sail area to move in light air, 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 40.0′, the Herreshoff 45 Cat Ketch tops out around 8.5 knots in displacement mode — after that, the bow wave outruns the hull and resistance climbs steeply.
1.34 × √40.0′ LWL = 8.5 kts
Performance Ratios
Racing handicap, sail-carrying power, stability and comfort — and what each one actually tells you about a day on the water.
PHRF Rating
114s/nm
Cruiser/racer — competitive in club racing, comfortable cruising.
SA / Displacement
19.1
Powerful cruiser/racer — quick in light air, reef early when it pipes up.
Ballast / Displacement
43.2%
Stiff enough to carry a big genoa comfortably into moderate breeze.
Displacement / Length
129
Ultralight — responsive and fast, but carries less stores.
Comfort Ratio
21.7
Acceptable coastal comfort — fine for weekends, notice the chop offshore.
Capsize Screening
2.03
Above the 2.0 offshore threshold — best suited for coastal and protected waters.
Pounds/Inch Immersion
12lbs
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
21.7
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
2.03
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 Herreshoff 45 Cat Ketch sits on the PHRF handicap spectrum — lower numbers mean faster boats.
Racer 0–90
Cruiser/Racer 90–150
Cruiser 150–210
Freedom 45 Cc
99s/nm
Freedom 45 Ac
105s/nm
Herreshoff 45 Cat Ketch
114s/nm
Cruiser/racer — competitive in club racing, comfortable cruising.
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° |
3.6 |
4.5 |
5.0 |
5.3 |
| Close Reach60° |
4.3 |
5.5 |
6.1 |
6.4 |
| Beam Reach90° |
5.3 |
6.7 |
7.5 |
8.1 |
| Broad Reach120–135° |
4.9 |
6.2 |
6.9 |
7.5 |
| Run150–180° |
3.9 |
4.9 |
5.5 |
5.8 |
These are simplified estimates based on hull speed (8.5 kts),
SA/D (19.1), 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 Herreshoff 45 Cat Ketch — 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 Herreshoff 45 Cat Ketch.
|
Herreshoff 45 Cat Ketch |
Caliber 45 |
Freedom 45 Ac |
Freedom 45 Cc |
Morgan 45 3 |
Nonsuch 40 |
| Dimensions |
| LOA |
45.0 |
45.0 |
45.0 |
45.0 |
45.0 |
45.0 |
| LWL |
40.0 |
35.8 |
34.4 |
34.4 |
36.8 |
40.0 |
| Beam |
13.4 |
13.3 |
13.5 |
13.5 |
13.4 |
14.1 |
| Displacement |
18 |
29 |
22 |
22 |
21 |
26 |
| Ballast |
8 |
12 |
9 |
9 |
— |
— |
| Sail Area |
830 |
940 |
731 |
731 |
928 |
— |
| Performance |
| PHRF |
114 |
— |
105 |
99 |
— |
— |
| SA/Disp |
19.1 |
16.0 |
14.5 |
14.5 |
19.6 |
— |
| Bal/Disp |
43.2 |
41.4 |
41.3 |
41.3 |
— |
— |
| Comfort |
21.7 |
36.9 |
29.5 |
29.5 |
26.1 |
29.5 |
| Capsize |
2.03 |
1.74 |
1.90 |
1.90 |
1.95 |
1.89 |
| Hull Speed |
8.5 |
8.0 |
7.9 |
7.9 |
8.1 |
8.5 |