The Schock 55 is aggressively canvassed for its weight, 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 44.0′, the Schock 55 tops out around 8.9 knots in displacement mode — after that, the bow wave outruns the hull and resistance climbs steeply.
1.34 × √44.0′ LWL = 8.9 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
28.1
Performance-oriented — carries a lot of canvas for its weight.
Ballast / Displacement
44.9%
Stiff enough to carry a big genoa comfortably into moderate breeze.
Displacement / Length
97
Ultralight — responsive and fast, but carries less stores.
Comfort Ratio
20.9
Acceptable coastal comfort — fine for weekends, notice the chop offshore.
Capsize Screening
1.89
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
20.9
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
1.89
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 Schock 55 sits on the PHRF handicap spectrum — lower numbers mean faster boats.
Racer 0–90
Cruiser/Racer 90–150
Baltic 55 Dp
30s/nm
Swan 53 2
44s/nm
Alden 54
60s/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° |
4.2 |
5.3 |
5.9 |
6.2 |
| Close Reach60° |
5.1 |
6.4 |
7.2 |
7.5 |
| Beam Reach90° |
6.2 |
7.9 |
8.8 |
9.5 |
| Broad Reach120–135° |
5.7 |
7.3 |
8.1 |
8.8 |
| Run150–180° |
4.6 |
5.8 |
6.5 |
6.8 |
These are simplified estimates based on hull speed (8.9 kts),
SA/D (28.1), 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 Schock 55 — based on sail area, ballast, and displacement characteristics.
Ghost
Sweet Spot
Reef
Heavy
0–5 kts
5–18 kts
18–28 kts
28+ kts
Ghosting
0–5 kts
Light air, motor-sailing likely. Need patience and a light genoa.
Sweet Spot
5–18 kts
Comfortable under full sail. Best speed-to-comfort ratio.
Time to Reef
18–28 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 Schock 55.
|
Schock 55 |
Alden 54 |
Baltic 55 Dp |
Endeavour 54 |
Swan 53 2 |
Swan 55Cc Frers |
| Dimensions |
| LOA |
55.0 |
54.1 |
55.0 |
54.5 |
54.1 |
55.0 |
| LWL |
44.0 |
40.0 |
47.4 |
43.8 |
47.2 |
42.9 |
| Beam |
12.5 |
14.3 |
16.1 |
15.8 |
15.6 |
15.9 |
| Displacement |
18 |
36 |
38 |
55 |
48 |
52 |
| Ballast |
8 |
15 |
16 |
13 |
18 |
19 |
| Sail Area |
1 |
1 |
— |
1 |
— |
1 |
| Performance |
| PHRF |
— |
60 |
30 |
— |
44 |
— |
| SA/Disp |
28.1 |
17.8 |
— |
11.3 |
— |
15.6 |
| Bal/Disp |
44.9 |
41.1 |
41.8 |
23.6 |
37.3 |
— |
| Comfort |
20.9 |
36.8 |
— |
46.0 |
— |
43.4 |
| Capsize |
1.89 |
1.73 |
— |
1.66 |
— |
1.71 |
| Hull Speed |
8.9 |
8.5 |
— |
8.9 |
— |
8.8 |