1980 Southern Cross 31 Ketch

New York, United States
$18,500 USD

LOA 31’ Beam 9’5” Draft 4’7 Displ 13,700lb. Full keel. Diesel, Yanmar 2QM 20. Well equipped. Sound. Comfortable for coastal cruising or bluewater passages. Sleeps 4. Owner has downsized. Details/photos at www.rocknaks.com/. Rockport, ME. $18,500.

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About the Southern Cross 31

Designer
Thomas Gillmer
Builder
C. E. Ryder
Associations
?
# Built
150
Hull Type
Long keel w/trans. hung rudder
Construction
FG

Dimensions

Length Overall
31 0 / 9.5 m
Waterline Length
25 0 / 7.6 m
Beam
9 6 / 2.9 m
Draft
4 7 / 1.4 m
Displacement
13,600 lbs / 6,169 kg
Ballast
4,400 lbs / 1,995 kg

Rig and Sails

Type
Cutter
Reported Sail Area
496 ft2 / 46.1 m2
Total Sail Area
495.5 ft2 / 46 m2
Mainsail
Sail Area
212.6 ft2 / 19.8 m2
P
31 5 / 9.6 m
E
13 5 / 4.1 m
Mast Height
?
Foresail
Sail Area
282.9 ft2 / 26.3 m2
I
36 6 / 11.1 m
J
15 5 / 4.7 m
Forestay Length
39 7 / 12.1 m

Auxilary Power

Make
?
Model
?
HP
?
Fuel Type
?
Fuel Capacity
?

Accomodations

Water Capacity
?
Holding Tank Capacity
?
Headroom
?

Calculations

Hull Speed
6.7 knots
Sail Area/Displacement
13.93
under powered
Ballast/Displacement
30.74
less stiff, less powerful
Displacement/Length
388.57
ultraheavy
Comfort Ratio
38.83
moderate bluewater cruising boat
Capsize Screening
1.59
better suited for ocean passages

Notes

From BlueWaterBoats.org:

The Southern Cross 31 is a no nonsense double-ender designed by Tom Gillmer, a professor of naval architecture at the US Naval Academy. The design takes influence from shapes dating back to Colin Archer’s work nearly a century earlier, and the hull in many respects is similar the straight transomed Allied Seawind 30, an earlier Gillmer creation notable for being the first fiberglass boat to circumnavigate the globe. (The Allied Seawind 30 was successful enough to be updated to the Allied Seawind II)

She’s a full keeled sailboat with an outboard rudder and tiller combo, a configuration often praised for its simplicity and the cockpit is quite small, suitable for ocean passages. The cutter rig with bowsprit has 447 sq. ft. of canvas, plenty for its displacement, but being a heavy displacement boat performance is hampered in light airs. Looking on the bright side, the weight gains dividends with a comfortable motion while underway.

Two interior layouts were offered, one with a stand up navigation station over a large locker and one with quarter-berth. The overall construction quality was of a good standard, suitably strong for offshore work. The hulls were built in fiberglass with the topsides cored in Airex foam, while the deck and cabin house was cored in balsa.

In total 130 boats were built between 1976 and 1987, of which a number were sold as hull and deck kits. A slightly larger and similar Gillmer design is the Aries 32 (around 20 of these were built).

» Southern Cross Owners Association
» Twenty Small Sailboats to Take You Anywhere by John Vigor, (Ch19, p117-123) an in depth look at the Southern Cross 31. ISBN:978-0939837328
» Ryder Yachts

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