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Riptide 31
Designer: Maurice Griffiths  ·  First built: 1970
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About the Riptide 31

Designed as an accessible and capable cruising sailboat, the Riptide 31 occupies a practical niche for sailors seeking a comfortable, manageable vessel for coastal and near-offshore adventures. With a hull length that places it in a versatile mid-size category, this boat appeals to both weekend cruisers and those looking to tackle longer passages along coastlines and between ports. While detailed specifications for the Riptide 31 are limited in the broader sailing literature, boats of this type and era were typically built with an emphasis on stability, straightforward handling, and enough interior volume to make extended stays aboard genuinely comfortable. These qualities make it a candidate worth considering for couples or small crews who prioritize ease of sailing over outright performance. Prospective buyers researching the Riptide 31 would be well advised to seek out existing owners and inspect available examples carefully, as build quality and outfitting can vary. Its modest size and cruising orientation suggest it would be most at home in sheltered coastal waters, making it a sensible choice for sailors building experience or looking to simplify their time on the water.

Core Dimensions
LOA (Length Overall) 30.75 ft / 9.37 m
LWL (Waterline Length) 26.00 ft / 7.92 m
Beam 9.50 ft / 2.90 m
Max Draft 3.67 ft / 1.12 m
Displacement 12,400.00 lb / 5,625 kg
Ballast 3,810.00 lb / 1,728 kg
Design & Construction
Hull Type Long Keel
Rigging Type Masthead Sloop
Construction Steel, Wood or GRP
Designer Maurice Griffiths
First Built 1970
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Performance Ratios
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
30.73
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
314.96
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. 5.29 pounds/inch
Rig Dimensions
I (Foretriangle Height) 19.78
P (Mainsail Luff) 660.00 ft² / 61.32 m²
E (Mainsail Foot) 314.96
How It Compares

vs. Commander 31 Bianca, Hallberg Rassy 312, Orion 27 2 Pacific Seacraft

This boat Similar boats
Dimensions
LOA
Riptide 31 ★
30.8 ft
Commander 31 Bianca
30.7 ft
Hallberg Rassy 312
30.9 ft
Orion 27 2 Pacific Seacraft
30.9 ft
LWL
Riptide 31 ★
26.0 ft
Commander 31 Bianca
22.0 ft
Hallberg Rassy 312
25.3 ft
Orion 27 2 Pacific Seacraft
22.2 ft
Beam
Riptide 31 ★
9.5 ft
Commander 31 Bianca
8.8 ft
Hallberg Rassy 312
10.1 ft
Orion 27 2 Pacific Seacraft
9.3 ft
Displacement
Riptide 31 ★
12 lbs
Commander 31 Bianca
7 lbs
Hallberg Rassy 312
10 lbs
Orion 27 2 Pacific Seacraft
10 lbs
Ballast
Riptide 31 ★
3 lbs
Commander 31 Bianca
3 lbs
Hallberg Rassy 312
4 lbs
Orion 27 2 Pacific Seacraft
3 lbs
Sail Area
Riptide 31 ★
Commander 31 Bianca
334 sq ft
Hallberg Rassy 312
484 sq ft
Orion 27 2 Pacific Seacraft
508 sq ft
Performance
SA / Displacement (higher = more powerful)
Riptide 31 ★
Commander 31 Bianca
13.7
Hallberg Rassy 312
15.9
Orion 27 2 Pacific Seacraft
17.6
Ballast / Disp (higher = stiffer)
Riptide 31 ★
30.7 %
Commander 31 Bianca
45.7 %
Hallberg Rassy 312
Orion 27 2 Pacific Seacraft
Comfort Ratio (higher = more comfortable offshore)
Riptide 31 ★
Commander 31 Bianca
26.6
Hallberg Rassy 312
28.5
Orion 27 2 Pacific Seacraft
32.2
Capsize Screening (lower = safer)
Riptide 31 ★
Commander 31 Bianca
1.79
Hallberg Rassy 312
1.83
Orion 27 2 Pacific Seacraft
1.72
Displacement / Length (lower = lighter)
Riptide 31 ★
314
Commander 31 Bianca
323
Hallberg Rassy 312
Orion 27 2 Pacific Seacraft
Hull Speed
Riptide 31 ★
Commander 31 Bianca
6.3 kts
Hallberg Rassy 312
6.7 kts
Orion 27 2 Pacific Seacraft
6.3 kts
Speed Number (higher = faster)
Riptide 31 ★
Commander 31 Bianca
Hallberg Rassy 312
1.6
Orion 27 2 Pacific Seacraft
1.0
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