Touted “the most expensive boat of its size” at her introduction in 1977, the diminutive Mariah 31 helped build Pacific Seacraft’s reputation for making quality boats. She was designed by the original co-founder of Pacific Seacraft, Henry Mohrschladt who only two years earlier kicked off the business with Mike Howarth building boats out of Howarth’s garage.
The Mariah 31 is a ridiculously sturdy boat, with hull thicknesses seldom seen in boats twice her length. We’re talking one inch at the topsides extending to 3 inches at the bilge, and deck thicknesses of an inch and a half (where you can hear owners complain they can’t readily find through-deck bolts long enough). As testament to her strength, Paul Lotus during his solo circumnavigation in Selene writes of surviving a blow with a semi-submerged shipping container without taking on any water, the impact had enough force to throw him clean off from his berth while he slept.
Not surprisingly she is heavy, requiring a lot of canvas hung from her 4ft bowsprit to keep her moving. Later MkII versions introduced a 5ft bowsprit. The interiors have a nice layout, loads of headroom and are finished in high quality teak.
Under sail she’s generally considered a slow boat, expect to clock regular 100 mile days in the trades with a well set up rig. She’s at her best on a reach, with 14-18 knots on the beam – expect a solid 6 knots. However with the wind from behind, her tub-like underbody and shoal keel doesn’t do much to reduce rolling motion which can get uncomfortably large.
Production ceased in 1983, the rumor was that the boat was too expensive to keep going. Before production ended a number of boats were sold as hull and deck kits and finished by their owners.
LOA MkI: 36′ 0″
LOA MkII: 37′ 0″
LOD: 30′ 11″
LWL: 25′ 0″
Beam: 10′ 8″
Draft: 4′ 5″
Displacement: 16,000 lbs.
Ballast (lead): 6,000 lbs.
Sail Area: 596 sq. ft.
Bridge Clearance: 45′ 4″
Headroom: 6′ 5″
Designer: Henry Mohrschladt
Builder: Pacific Seacraft
Year Introduced: 1977
Last built: 1983
Links and Further Reading
» Mariah 31 Yahoo Group, owner discussions.
» Confessions of a Long Distance Sailor by Paul Lotus, a solo circumnavigation in a Mariah 31.
» Mariah 31 Sea Trial by Earl R. Hinz, Sea Magazine, Aug 1978.