Back to Search
Privateer 18
 ·  Builder: Bock Boats (Usa)  ·  First built: 1960
+ Add to Compare
About the Privateer 18

First launched in 1960 by Bock Boats, this compact fractional sloop represents classic American small boat design from the early fiberglass era. Built with solid construction principles, the Privateer 18 features a fin keel configuration that provides good pointing ability while maintaining reasonable stability for its size class. With a displacement of 1,700 pounds and 585 pounds of ballast, this design strikes a balance between performance and seaworthiness that makes it well-suited for protected coastal waters and small lake sailing. The 215 square feet of sail area provides adequate power for light to moderate conditions, while the fractional rig offers flexibility in sail handling and reduces weather helm tendencies. The boat's comfort ratio of 13.19 indicates a relatively stiff, quick motion that prioritizes responsiveness over cushioned ride quality. Combined with a capsize screening formula of 2.18, these numbers suggest the Privateer 18 is best suited for day sailing and short coastal hops rather than extended cruising or offshore passages. At 17.5 feet overall with a 6.5-foot beam, the cockpit provides adequate space for small crews while maintaining manageable size for trailering and storage. This makes it an attractive option for sailors seeking an honest, straightforward design for weekend adventures and sailing instruction.

Core Dimensions
LOA (Length Overall) 17.50 ft / 5.33 m
LWL (Waterline Length) 16.00 ft / 4.88 m
Beam 6.50 ft / 1.98 m
Max Draft 2.75 ft / 0.84 m
Displacement 1,700.00 lb / 771 kg
Ballast 585.00 lb / 265 kg
Sail Area (Reported) 215.00 ft² / 19.97 m²
Design & Construction
Hull Type Fin Keel
Rigging Type Fractional Sloop
Construction FG
Builder Bock Boats (USA)
First Built 1960
Owner Reviews

No owner reviews yet — be the first to share your experience with this boat.

Performance Ratios
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
24.2
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
34.41
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
185.29
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
13.19
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
2.18
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. 5.36 kn
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. 371.60 pounds/inch
How It Compares

vs. Montgomery 17, Precision 18, Siren 17, Sovereign 18, Venture 17

This boat Similar boats
Dimensions
LOA
Privateer 18 ★
17.5 ft
Montgomery 17
17.1 ft
Precision 18
17.4 ft
Siren 17
17.2 ft
Sovereign 18
18.0 ft
Venture 17
17.3 ft
LWL
Privateer 18 ★
16.0 ft
Montgomery 17
15.8 ft
Precision 18
15.4 ft
Siren 17
15.0 ft
Sovereign 18
14.5 ft
Venture 17
15.0 ft
Beam
Privateer 18 ★
6.5 ft
Montgomery 17
7.3 ft
Precision 18
7.4 ft
Siren 17
6.7 ft
Sovereign 18
7.0 ft
Venture 17
6.3 ft
Displacement
Privateer 18 ★
1 lbs
Montgomery 17
1 lbs
Precision 18
1 lbs
Siren 17
750 lbs
Sovereign 18
1 lbs
Venture 17
900 lbs
Ballast
Privateer 18 ★
585 lbs
Montgomery 17
550 lbs
Precision 18
350 lbs
Siren 17
130 lbs
Sovereign 18
540 lbs
Venture 17
270 lbs
Sail Area
Privateer 18 ★
215 sq ft
Montgomery 17
154 sq ft
Precision 18
Siren 17
139 sq ft
Sovereign 18
123 sq ft
Venture 17
Performance
PHRF Rating (lower = faster)
Privateer 18 ★
Montgomery 17
264 s/nm
Precision 18
262 s/nm
Siren 17
Sovereign 18
Venture 17
314 s/nm
SA / Displacement (higher = more powerful)
Privateer 18 ★
24.2
Montgomery 17
19.7
Precision 18
Siren 17
27.0
Sovereign 18
16.1
Venture 17
Ballast / Disp (higher = stiffer)
Privateer 18 ★
34.4 %
Montgomery 17
39.3 %
Precision 18
31.8 %
Siren 17
17.3 %
Sovereign 18
40.0 %
Venture 17
30.0 %
Comfort Ratio (higher = more comfortable offshore)
Privateer 18 ★
13.2
Montgomery 17
9.4
Precision 18
Siren 17
5.9
Sovereign 18
10.0
Venture 17
Capsize Screening (lower = safer)
Privateer 18 ★
2.18
Montgomery 17
2.62
Precision 18
Siren 17
2.94
Sovereign 18
2.54
Venture 17
Displacement / Length (lower = lighter)
Privateer 18 ★
185
Montgomery 17
157
Precision 18
133
Siren 17
99
Sovereign 18
197
Venture 17
119
Hull Speed
Privateer 18 ★
5.4 kts
Montgomery 17
5.3 kts
Precision 18
Siren 17
5.2 kts
Sovereign 18
5.1 kts
Venture 17
Speed Number (higher = faster)
Privateer 18 ★
Montgomery 17
Precision 18
Siren 17
5.8
Sovereign 18
2.6
Venture 17
Find a Privateer 18 For Sale