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Sailboat

Mariah 31

1977 — 1983
Designer
Henry Morschadt
Builder
Pacific Seacraft
Hull Type
Long keel w/trans. hung rudder
Construction
FG

Dimensions

Length Overall
36.00 ft / 10.97 m
Length On Deck
30.92 ft / 9.42 m
Waterline Length
25.00 ft / 7.62 m
Beam
10.67 ft / 3.25 m
Draft
4.42 ft / 1.35 m
Displacement
16,000 lb / 7,257 kg
Ballast
6,000 lb / 2,722 kg
drawing

Rig and Sails

Type
Cutter
Reported Sail Area
576.00 ft2 / 53.51 m2
Total Sail Area
575.93 ft2 / 53.51 m2
Mainsail
Sail Area
255.50 ft2 / 23.74 m2
P
36.50 ft / 11.13 m
E
14.00 ft / 4.27 m
Mast Height
45.33 ft / 13.82 m
Foresail
Sail Area
320.43 ft2 / 29.77 m2
I
41.56 ft / 12.67 m
J
15.42 ft / 4.70 m
Est. Forestay Len.
44.33 ft / 13.51 m

Spinnaker

SPL/TPS
ISP

Auxilary Power

Make
?
Model
?
HP
?
Type
?
Fuel Capacity
35 gals / 132 L

Accomodations

Water Capacity
70 gals / 265 L
Holding Tank Capacity
?
Headroom
6.42 ft / 1.96 m

Calculations

Hull Speed
6.7 knots
Sail Area/Displacement
14.51
under powered
Ballast/Displacement
37.5
less stiff, less powerful
Displacement/Length
457.14
ultraheavy
Comfort Ratio
38.74
moderate bluewater cruising boat
Capsize Screening
1.71
better suited for ocean passages

Notes

From BlueWaterBoats.org:

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 Lutus 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.

» 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.


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