Sigma 18

1979 — 1980
Designer
Brian Amato
Builder
Sigma Sailcraft Co.(USA)
Associations
?
# Built
?
Hull Type
Fin w/transom hung rudder
Construction
FG

Dimensions

Length Overall
17 5 / 5.3 m
Waterline Length
15 3 / 4.7 m
Beam
6 3 / 1.9 m
Draft
2 0 / 0.6 m
Displacement
1,220 lbs / 553 kg
Ballast
450 lbs / 204 kg

Rig and Sails

Type
Fractional Sloop
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
5.23 knots
Sail Area/Displacement
21.02
high performance
Ballast/Displacement
36.89
less stiff, less powerful
Displacement/Length
153.57
light
Comfort Ratio
10.07
lightweight racing boat
Capsize Screening
2.37
better suited for coastal cruising

Notes

Originally the TANGERINE 18. Relatively few built as SIGMA 18. The molds were purchased by Renkin, primarily, a builder of powerboats, where it became the RENKIN 18.


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