Nacra 5.5 (18 SQ. Meter)

1979
Designer
Tom Roland
Builder
NACRA Catamarans
Associations
?
# Built
?
Hull Type
Catamaran Twin Dbrd.
Construction
FG

Dimensions

Length Overall
18 0 / 5.5 m
Waterline Length
?
Beam
10 11 / 3.4 m
Draft
0 5 / 0.1 m 2 9 / 0.9 m
Displacement
330 lbs / 150 kg
Ballast
?
drawing

Rig and Sails

Type
Cat (rotating spar)
Reported Sail Area
193 ft2 / 17.9 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
?
Sail Area/Displacement
64.66
high performance
Ballast/Displacement
?
Displacement/Length
?
Comfort Ratio
?
Capsize Screening
6.37
better suited for coastal cruising

Notes

Also called NACRA 18M2.
Designed for maximum length, beam (11’) and SA allowed by the single handed 18 Sq. Meter ‘box’ rule which had been recently established at the time. (NACRA’s version was introduced first using the standard hulls of the NACRA 5.2. Later (1983?, updated with a new, full length, hull design.(18’)
Another NACRA 5.5 (non-18SM) was available with the same hulls, less beam and a sloop rig.
The NACRA 5.5 (18sm) shown here has the boom (gooseneck) attached to forward beam.
This was replaced in the mid 1980’s with a newer NACRA 18sm with the updated 5.5m hulls and boomless rig.


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