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Schock 34 Gp
Designer: Nelson/Marek  ·  Builder: W. D. Schock Corp.(Usa)  ·  First built: 1985
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About the Schock 34 Gp

Designed by the respected Nelson/Marek team and built by W. D. Schock Corp., this 34-footer represents a fascinating piece of 1980s sailing yacht evolution, though with only three hulls produced during its brief production run starting in 1985, it remains one of the rarer finds in today's used boat market. The Schock 34 Gp showcases classic performance-oriented design characteristics with its fin keel and spade rudder configuration, delivering responsive handling that appeals to sailors seeking an engaging helm experience. With a sail area to displacement ratio of 21 and a relatively light 8,500-pound displacement, this yacht demonstrates spirited performance potential while maintaining reasonable stability with 3,220 pounds of ballast. The boat's proportions suggest versatility for both coastal cruising and club racing, with enough beam at 11.58 feet to provide comfortable interior volume while maintaining the sleek lines that contribute to its 7.17-knot theoretical hull speed. The moderate comfort ratio of 16.68 indicates a design balanced between performance and livability, making it suitable for weekend coastal adventures rather than extended offshore passages. Given its rarity and the reputation of both its design team and builder, the Schock 34 Gp represents an intriguing option for sailors seeking something distinctive in the competitive 34-foot market segment.

Core Dimensions
LOA (Length Overall) 33.83 ft / 10.31 m
LWL (Waterline Length) 28.60 ft / 8.72 m
Beam 11.58 ft / 3.53 m
Max Draft 6.50 ft / 1.98 m
Displacement 8,500.00 lb / 3,856 kg
Ballast 3,220.00 lb / 1,461 kg
Ballast Type Lead
Sail Area (Reported) 545.00 ft² / 50.63 m²
Design & Construction
Hull Type Fin w/spade rudder
Rigging Type Masthead Sloop
Construction FG
Designer Nelson/Marek
Builder W. D. Schock Corp.(USA)
First Built 1985
Number Built 3
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Performance Ratios
PHRF Rating PHRF (Performance Handicap Racing Fleet) is a national racing handicap measured in seconds per nautical mile. Lower values indicate faster boats. Ratings are sourced from US Sailing's national database (median across 60+ regional fleets).
Under 0 — Ultralight racer0–90 — Performance racer90–150 — Cruiser/racer150–210 — Typical cruiserOver 210 — Heavy/slow cruiser
 90
SA/Displacement Sail Area to Displacement ratio measures how much sail power a boat has relative to its weight. Higher values mean more performance and speed.
Under 14 — Heavy cruiser, slow14–18 — Cruising sailboat18–22 — Cruiser/racerOver 22 — Performance racer
 21
Ballast/Displacement Ballast to Displacement ratio shows what percentage of the boat's total weight is ballast. Higher values generally mean better initial stability and stiffer sail carrying.
30–35% — Typical cruiser35–45% — Stiff performance boatOver 45% — Racing oriented
 37.88
Displacement/Length Displacement to Length ratio measures how heavy a boat is relative to its waterline length. Lower values mean a lighter, faster boat.
Under 100 — Ultralight racer100–200 — Light cruiser/racer200–300 — Moderate cruiser300–400 — Heavy cruiserOver 400 — Very heavy
 162.21
Comfort Ratio Ted Brewer's Comfort Ratio predicts how comfortable a boat will feel in offshore conditions. Higher values mean a steadier, more comfortable motion in a seaway.
Under 20 — Uncomfortably rough20–30 — Acceptable coastal30–40 — Good offshore comfortOver 40 — Very comfortable offshore
 16.68
Capsize Screening Formula The USHS Capsize Screening Formula estimates offshore capsize risk. Lower is safer — values under 2.0 are considered acceptable for offshore sailing.
Under 2.0 — Safe for offshore2.0–2.2 — Borderline offshoreOver 2.2 — Coastal use recommended
 2.27
Hull Speed Hull Speed is the theoretical maximum speed of a displacement hull, calculated from waterline length. Most cruising sailboats reach this speed in moderate conditions. 7.17 kn
S# (Speed Number) The Speed Number (S#) is a quick performance index. Higher values indicate a faster, more powerful design relative to its size.
Under 3.0 — Slow cruiser3.0–5.0 — Average cruiser5.0–7.0 — Performance cruiserOver 7.0 — Racer
 3.82
Pounds/Inch Immersion Pounds per Inch Immersion (PPI) tells you how much weight is needed to sink the boat one inch. Useful for calculating how additional gear and stores affect waterline. 1,183.37 pounds/inch
SA/Displacement (Calc) Calculated Sail Area to Displacement ratio using actual measured sail dimensions rather than reported values. More precise than the reported SA/Disp figure. 21.84
Rig Dimensions
I (Foretriangle Height) 44.10 ft / 13.44 m
J (Foretriangle Base) 13.00 ft / 3.96 m
P (Mainsail Luff) 40.00 ft / 12.19 m
E (Mainsail Foot) 14.00 ft / 4.27 m
SA Fore 286.65 ft² / 26.63 m²
SA Main 280.00 ft² / 26.01 m²
SA Total (100%) 566.65 ft² / 52.64 m²
Est. Forestay Length 45.98 ft / 14.01 m
Engine & Accommodations
Engine Make Yanmar
Engine Model 2GM20
Engine Type Diesel
Horsepower 18
Fuel Capacity 20 gals / 76 L
Water Capacity 20 gals / 76 L
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