Australis Catamaran

1966
Designer
Graham Johnston
Builders
?
Associations
?
# Built
?
Hull Type
Catamaran Twin Dbrd.
Construction
Wood/FG

Dimensions

Length Overall
18 0 / 5.5 m
Waterline Length
17 9 / 5.4 m
Beam
7 6 / 2.3 m
Draft
0 5 / 0.2 m 2 11 / 0.9 m
Displacement
150 lbs / 67 kg
Ballast
?
drawing

Rig and Sails

Type
Cat (rotating spar)
Reported Sail Area
150 ft2 / 13.9 m2
Total Sail Area
?
Mainsail
Sail Area
?
P
?
E
?
Mast Height
?
Foresail
Sail Area
?
I
?
J
?
Forestay Length
?

Auxilary Power

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

Accomodations

Water Capacity
?
Holding Tank Capacity
?
Headroom
?

Calculations

Hull Speed
5.66 knots
Sail Area/Displacement
86.17
high performance
Ballast/Displacement
?
Displacement/Length
11.58
Ultralight
Comfort Ratio
0.86
lightweight racing boat
Capsize Screening
5.68
better suited for coastal cruising

Notes

Australian designed ‘A’ class that trounced the competition at the 1967 IYRU selection trails for a new single handed catamaran. Almost immediately it was granted international status and licenses were granted to a number of builders around the world. However, the class never achieved any wide spread popularity and the International designation was withdrawn in 1973.


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