The Cm 46 is with a quick, snappy motion best suited to day sailing.
Hull Speed
The theoretical displacement-mode speed limit — determined by waterline length, not engine or sail power.
9.2 kts
A displacement hull pushes a bow wave whose speed is limited by the waterline length.
With a waterline of 46.6′, the Cm 46 tops out around 9.2 knots in displacement mode — after that, the bow wave outruns the hull and resistance climbs steeply.
1.34 × √46.6′ LWL = 9.1 kts
Performance Ratios
Racing handicap, sail-carrying power, stability and comfort — and what each one actually tells you about a day on the water.
Comfort Ratio
6.7
Quick, snappy motion — better for day sails and racing than long passages.
Capsize Screening
4.01
Above the 2.0 offshore threshold — best suited for coastal and protected waters.
Hull Speed
9.2kts
Pounds/Inch Immersion
24lbs
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
6.7
Quick, snappy motion — better for day sails and racing than long passages.
Under 20 — Snappy, racing motion
20–30 — Acceptable coastal
30–40 — Good offshore comfort
Over 40 — Very comfortable offshore
Capsize Screening Formula
4.01
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 Cm 46 sits on the PHRF handicap spectrum — lower numbers mean faster boats.
Tartan 4700
How It Compares
Side-by-side with the boats most often cross-shopped against the Cm 46.
| Cm 46 | First 44 Beneteau | Lagoon 47 | Sun Odyssey 455 Jeanneau | Tartan 4700 | X46 | |
|---|---|---|---|---|---|---|
| Dimensions | ||||||
| LOA | 46.6 | 46.4 | 46.3 | 46.3 | 46.9 | 46.2 |
| LWL | 46.6 | 42.1 | 42.7 | 39.7 | 39.5 | 40.5 |
| Beam | 24.3 | 13.9 | 24.9 | 14.4 | 14.1 | 14.0 |
| Displacement | 14 | 23 | 19 | 25 | 28 | 24 |
| Ballast | — | 7 | — | 9 | 9 | 9 |
| Sail Area | 1 | 1 | — | 1,044 | 1 | 1 |
| Performance | ||||||
| PHRF | — | — | — | — | 84 | — |
| SA/Disp | — | 22.3 | — | 19.1 | 17.8 | 21.9 |
| Bal/Disp | — | 31.0 | — | 35.9 | 34.8 | — |
| Comfort | 6.7 | 25.1 | 9.6 | 27.1 | 30.6 | 26.2 |
| Capsize | 4.01 | 1.95 | 3.69 | 1.96 | 1.86 | 1.95 |
| Hull Speed | 9.2 | 8.7 | 8.8 | 8.4 | 8.4 | 8.5 |