The First 42S7 Beneteau is moderately powered for comfortable coastal cruising, 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 35.8′, the First 42S7 Beneteau tops out around 8.0 knots in displacement mode — after that, the bow wave outruns the hull and resistance climbs steeply.
1.34 × √35.8′ LWL = 8.0 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
17.9
Moderate sail power — a capable coastal cruiser, not overpowered.
Ballast / Displacement
34.5%
Typical cruising ballast — balanced stability and motion underway.
Displacement / Length
178
Moderate — a good balance of speed and load-carrying ability.
Comfort Ratio
23.3
Acceptable coastal comfort — fine for weekends, notice the chop offshore.
Capsize Screening
2.06
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
23.3
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
2.06
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 First 42S7 Beneteau sits on the PHRF handicap spectrum — lower numbers mean faster boats.
Racer 0–90
Cruiser/Racer 90–150
Cruiser 150–210
J/42
78s/nm
Sabre 425
96s/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° |
3.3 |
4.1 |
4.6 |
4.8 |
| Close Reach60° |
4.0 |
5.0 |
5.6 |
5.8 |
| Beam Reach90° |
4.9 |
6.1 |
6.9 |
7.4 |
| Broad Reach120–135° |
4.5 |
5.7 |
6.3 |
6.9 |
| Run150–180° |
3.6 |
4.5 |
5.1 |
5.3 |
These are simplified estimates based on hull speed (8.0 kts),
SA/D (17.9), 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 First 42S7 Beneteau — based on sail area, ballast, and displacement characteristics.
Ghost
Sweet Spot
Reef
Heavy
0–7 kts
7–20 kts
20–28 kts
28+ kts
Ghosting
0–7 kts
Light air, motor-sailing likely. Need patience and a light genoa.
Sweet Spot
7–20 kts
Comfortable under full sail. Best speed-to-comfort ratio.
Time to Reef
20–28 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 First 42S7 Beneteau.
|
First 42S7 Beneteau |
Catalina 425 |
Contest 43 |
J/42 |
Sabre 425 |
Sun Odyssey 415 Jeanneau |
| Dimensions |
| LOA |
42.5 |
42.5 |
42.7 |
42.5 |
42.4 |
42.7 |
| LWL |
35.8 |
37.0 |
36.3 |
36.0 |
34.7 |
36.4 |
| Beam |
13.5 |
13.8 |
13.1 |
13.5 |
12.8 |
13.8 |
| Displacement |
18 |
21 |
26 |
19 |
19 |
20 |
| Ballast |
6 |
8 |
10 |
8 |
8 |
7 |
| Sail Area |
771 |
870 |
880 |
840 |
766 |
871 |
| Performance |
| PHRF |
— |
— |
— |
78 |
96 |
— |
| SA/Disp |
17.9 |
18.3 |
16.1 |
17.0 |
17.2 |
18.3 |
| Bal/Disp |
34.5 |
40.0 |
40.0 |
42.1 |
42.7 |
35.8 |
| Comfort |
23.3 |
25.4 |
34.2 |
34.1 |
26.8 |
25.5 |
| Capsize |
2.06 |
2.00 |
1.78 |
1.59 |
1.92 |
2.00 |
| Hull Speed |
8.0 |
8.2 |
8.1 |
9.8 |
7.9 |
8.1 |