Southern Cross 39

1981 — 1990
Designer
Thomas Gillmer
Builder
C. E. Ryder
Associations
?
# Built
?
Hull
Monohull
Keel
Fin
Rudder
Skeg
Construction
FG/ hull w/ Airex/ Deck w/balsa

Dimensions

Length Overall
39 0 / 11.9 m
Waterline Length
31 0 / 9.5 m
Beam
12 11 / 3.9 m
Draft
5 3 / 1.6 m
Displacement
21,000 lb / 9,525 kg
Ballast
7,680 lb / 3,482 kg (Lead)

Rig and Sails

Type
Cutter
Reported Sail Area
774′² / 71.9 m²
Total Sail Area
774′² / 71.9 m²
Mainsail
Sail Area
333′² / 30.9 m²
P
45 0 / 13.7 m
E
14 9 / 4.5 m
Mast Height
?
Foresail
Sail Area
441′² / 41 m²
I
50 11 / 15.5 m
J
17 3 / 5.3 m
Forestay Length
53 10 / 16.4 m

Auxilary Power

Make
Universal
Model
?
HP
40
Fuel Type
Diesel
Fuel Capacity
50 gal / 189 l

Accomodations

Water Capacity
120 gal / 454 l
Holding Tank Capacity
?
Headroom
?
Cabins
?

Calculations

Hull Speed
7.46 knots
Sail Area/Displacement
16.27
good performance
Ballast/Displacement
36.55
less stiff, less powerful
Displacement/Length
314.69
heavy
Comfort Ratio
34.93
moderate bluewater cruising boat
Capsize Screening
1.75
better suited for ocean passages

Notes

From BlueWaterBoats.org:

The Southern Cross 39 is a no nonsense double-ender following the theme of her two smaller siblings the Southern Cross 31 and Southern Cross 35. Designed by Thomas Gillmer, a professor of naval architecture at the US Naval Academy, she has the same canoe stern and sharply rising sheer line, but underneath Gillmer gave her a fin keel and skeg hung rudder arrangement to increase the performance of this passage making machine. Her cutter rig with bowsprit has 774 sq. ft. of canvas, plenty for her displacement of 21,000 lbs.

Launched in 1981, the first 13 hulls were factory built and bathed in fine light teak. About half of the subsequent models were sold as kits and owner finished so interior layouts can vary. The most common configuration has a V-berth forward, quarter berth portside, and superb seagoing galley amidships. The galley is easy to access from the companionway with a U-shaped orientation for security offshore. The hulls were built in fiberglass with Airex foam coring throughout while the deck and cabin house were balsa cored. The ballast is internally set cast iron. Water tanks are set in the keel while the fuel tank is underneath the aft berth.

These boats were built until 1990 when the Ryder factory closed.

Links, References and Further Reading

» Southern Cross Owners Association
» Ryder Yachts

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