The Ansa 47 is well-powered with enough sail area to move in light air, 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 36.4′, the Ansa 47 tops out around 8.1 knots in displacement mode — after that, the bow wave outruns the hull and resistance climbs steeply.
1.34 × √36.4′ LWL = 8.1 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
21.1
Powerful cruiser/racer — quick in light air, reef early when it pipes up.
Ballast / Displacement
47.5%
Race-oriented ballast ratio — very stiff and powerful.
Displacement / Length
240
Moderate — a good balance of speed and load-carrying ability.
Comfort Ratio
33.1
Good offshore comfort — steady enough for multi-day passages.
Capsize Screening
1.78
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
33.1
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
1.78
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 Ansa 47 sits on the PHRF handicap spectrum — lower numbers mean faster boats.
Racer 0–90
Cruiser/Racer 90–150
Cruiser 150–210
Centurion 45
63s/nm
Tartan 4600
75s/nm
Baltic 46
83s/nm
Oyster 46
135s/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° |
3.6 |
4.5 |
5.1 |
5.3 |
| Close Reach60° |
4.3 |
5.5 |
6.1 |
6.4 |
| Beam Reach90° |
5.3 |
6.7 |
7.5 |
7.9 |
| Broad Reach120–135° |
4.9 |
6.2 |
7.0 |
7.3 |
| Run150–180° |
3.9 |
5.0 |
5.6 |
5.8 |
These are simplified estimates based on hull speed (8.1 kts),
SA/D (21.1), 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 Ansa 47 — 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 Ansa 47.
|
Ansa 47 |
Baltic 46 |
Centurion 45 |
Elite 45 |
Oyster 46 |
Tartan 4600 |
| Dimensions |
| LOA |
46.0 |
46.2 |
46.2 |
45.9 |
46.0 |
46.2 |
| LWL |
36.4 |
38.3 |
36.2 |
36.1 |
39.6 |
39.6 |
| Beam |
13.2 |
13.5 |
13.3 |
14.1 |
14.0 |
14.3 |
| Displacement |
26 |
26 |
24 |
22 |
31 |
28 |
| Ballast |
12 |
— |
9 |
8 |
12 |
8 |
| Sail Area |
1 |
920 |
886 |
1 |
980 |
— |
| Performance |
| PHRF |
— |
83 |
63 |
— |
135 |
75 |
| SA/Disp |
21.1 |
16.5 |
17.0 |
23.6 |
15.6 |
— |
| Bal/Disp |
47.5 |
— |
39.1 |
40.0 |
40.3 |
30.4 |
| Comfort |
33.1 |
31.6 |
30.4 |
25.7 |
35.4 |
— |
| Capsize |
1.78 |
1.82 |
1.84 |
2.01 |
1.77 |
— |
| Hull Speed |
8.1 |
8.3 |
8.1 |
8.1 |
8.4 |
— |