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Mariah 30
Designer: Alan Andrews  ·  First built: 1991
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About the Mariah 30

With limited documentation available, the Mariah 30 represents one of those intriguing sailboats that has quietly served coastal sailors without widespread recognition in the mainstream sailing press. This 30-foot design appears to have been produced in relatively small numbers, making it something of a hidden gem for sailors seeking an affordable entry into cruising. Based on her proportions and era, the Mariah 30 likely embodies the practical design philosophy of her time, emphasizing seaworthiness and comfortable accommodations over racing performance. Her moderate displacement and beam suggest she would be well-suited for coastal cruising and weekend adventures, offering a good balance of stability and maneuverability. The limited availability of detailed specifications often indicates a boat that was built by a smaller manufacturer or had a shorter production run, which can translate to unique character and potentially attractive pricing in the used boat market. For sailors willing to do their homework and conduct thorough surveys, boats like the Mariah 30 can offer excellent value, providing solid sailing capabilities and the satisfaction of owning something distinctive rather than following the crowd toward more common production boats.

Core Dimensions
LOA (Length Overall) 30.00 ft / 9.14 m
LWL (Waterline Length) 25.83 ft / 7.87 m
Beam 10.42 ft / 3.18 m
Max Draft 5.92 ft / 1.80 m
Displacement 7,000.00 lb / 3,175 kg
Sail Area (Reported) 567.00 ft² / 52.68 m²
Design & Construction
Hull Type Fin w/spade rudder
Rigging Type Masthead Sloop
Construction FG
Designer Alan Andrews
First Built 1991
Owner Reviews

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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
 99
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
 24.87
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
 17.61
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. 6.81
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
 3.44
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. 961.7
Rig Dimensions
I (Foretriangle Height) 41.42
J (Foretriangle Base) 12.0
P (Mainsail Luff) 36.5
E (Mainsail Foot) 12.92
SA Fore 248.52
SA Main 235.79
Find a Mariah 30 For Sale
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