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Mariner 17 Milne
Designer: Peter Milne  ·  Builder: Richmond Marine (Uk)  ·  First built: 1970
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About the Mariner 17 Milne

Designed by Peter Milne and built by Richmond Marine in the UK starting in 1970, this compact 17-footer represents classic British small boat design philosophy with its twin centerboard configuration and fractional sloop rig. With 1,600 hulls produced, the Mariner 17 earned a solid reputation among sailors seeking an affordable entry into keelboat sailing. The twin centerboard system offers significant advantages for shallow water exploration and trailer sailing, allowing access to beaches and shallow anchorages that would be impossible with a fixed keel. At 700 pounds displacement with only 100 pounds of ballast, this is clearly a boat that relies more on crew weight and sailing skill than pure stability, making it an excellent trainer for developing boat handling techniques. The fractional rig with 155 square feet of sail area provides spirited performance in light to moderate conditions, while the fiberglass construction ensures durability and low maintenance. With a comfort ratio of 5.02 and capsize screening of 3.16, the Mariner 17 is best suited for protected waters, day sailing, and coastal cruising rather than offshore adventures. Its modest beam of seven feet keeps trailering straightforward, making it ideal for sailors who want to explore different sailing grounds.

Core Dimensions
LOA (Length Overall) 17.00 ft / 5.18 m
LWL (Waterline Length) 15.75 ft / 4.80 m
Beam 7.00 ft / 2.13 m
Max Draft 4.50 ft / 1.37 m
Min Draft 0.75 ft / 0.23 m
Displacement 700.00 lb / 318 kg
Ballast 100.00 lb / 45 kg
Sail Area (Reported) 155.00 ft² / 14.40 m²
Design & Construction
Hull Type Twin Centerboards
Rigging Type Fractional Sloop
Construction FG
Designer Peter Milne
Builder Richmond Marine (UK)
First Built 1970
Number Built 1600
Related Sailboats Leisure 17 · Holder 17 · Vagabond 17 · Montgomery 17 · Siren 17
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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
31.51
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
14.29
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
79.98
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
5.02
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
3.16
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. 5.32 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. 393.94 pounds/inch
How It Compares

vs. Holder 17, Leisure 17, Montgomery 17, Siren 17, Vagabond 17

This boat Similar boats
Dimensions
LOA
Mariner 17 Milne ★
17.0 ft
Holder 17
17.0 ft
Leisure 17
17.0 ft
Montgomery 17
17.1 ft
Siren 17
17.2 ft
Vagabond 17
17.0 ft
LWL
Mariner 17 Milne ★
15.8 ft
Holder 17
15.0 ft
Leisure 17
14.0 ft
Montgomery 17
15.8 ft
Siren 17
15.0 ft
Vagabond 17
15.0 ft
Beam
Mariner 17 Milne ★
7.0 ft
Holder 17
7.3 ft
Leisure 17
7.0 ft
Montgomery 17
7.3 ft
Siren 17
6.7 ft
Vagabond 17
7.3 ft
Displacement
Mariner 17 Milne ★
700 lbs
Holder 17
950 lbs
Leisure 17
1 lbs
Montgomery 17
1 lbs
Siren 17
750 lbs
Vagabond 17
950 lbs
Ballast
Mariner 17 Milne ★
100 lbs
Holder 17
345 lbs
Leisure 17
550 lbs
Montgomery 17
550 lbs
Siren 17
130 lbs
Vagabond 17
345 lbs
Sail Area
Mariner 17 Milne ★
155 sq ft
Holder 17
147 sq ft
Leisure 17
148 sq ft
Montgomery 17
154 sq ft
Siren 17
139 sq ft
Vagabond 17
Performance
PHRF Rating (lower = faster)
Mariner 17 Milne ★
Holder 17
Leisure 17
Montgomery 17
264 s/nm
Siren 17
Vagabond 17
270 s/nm
SA / Displacement (higher = more powerful)
Mariner 17 Milne ★
31.5
Holder 17
24.4
Leisure 17
18.3
Montgomery 17
19.7
Siren 17
27.0
Vagabond 17
13.6
Ballast / Disp (higher = stiffer)
Mariner 17 Milne ★
14.3 %
Holder 17
Leisure 17
Montgomery 17
39.3 %
Siren 17
17.3 %
Vagabond 17
36.3 %
Comfort Ratio (higher = more comfortable offshore)
Mariner 17 Milne ★
5.0
Holder 17
6.7
Leisure 17
11.5
Montgomery 17
9.4
Siren 17
5.9
Vagabond 17
Capsize Screening (lower = safer)
Mariner 17 Milne ★
3.16
Holder 17
2.95
Leisure 17
2.46
Montgomery 17
2.62
Siren 17
2.94
Vagabond 17
Displacement / Length (lower = lighter)
Mariner 17 Milne ★
79
Holder 17
Leisure 17
Montgomery 17
157
Siren 17
99
Vagabond 17
125
Hull Speed
Mariner 17 Milne ★
5.3 kts
Holder 17
5.2 kts
Leisure 17
5.0 kts
Montgomery 17
5.3 kts
Siren 17
5.2 kts
Vagabond 17
Speed Number (higher = faster)
Mariner 17 Milne ★
Holder 17
4.7
Leisure 17
Montgomery 17
Siren 17
5.8
Vagabond 17
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