Cal 20

1961 — 1975
insignia
Designer
C. William Lapworth
Builders
Jensen Marine/Cal Boats
Calgan Marine Ltd.
Association
Cal 20 National Class Association
# Built
1945
Hull Type
Fin w/transom hung rudder
Construction
FG

Dimensions

Length Overall
20 0 / 6.1 m
Waterline Length
18 0 / 5.5 m
Beam
6 11 / 2.1 m
Draft
3 3 / 1 m
Displacement
1,950 lbs / 885 kg
Ballast
900 lbs / 408 kg
drawing

Rig and Sails

Type
Fractional Sloop
Reported Sail Area
195 ft2 / 18.1 m2
Total Sail Area
195.3 ft2 / 18.1 m2
Mainsail
Sail Area
115 ft2 / 10.7 m2
P
22 11 / 7 m
E
10 0 / 3.1 m
Mast Height
?
Foresail
Sail Area
80.3 ft2 / 7.5 m2
I
22 0 / 6.7 m
J
7 3 / 2.2 m
Forestay Length
23 2 / 7.1 m

Auxilary Power

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

Accomodations

Water Capacity
?
Holding Tank Capacity
?
Headroom
?

Calculations

Hull Speed
5.69 knots
Sail Area/Displacement
19.99
good performance
Ballast/Displacement
46.15
stiffer, more powerful
Displacement/Length
149.27
light
Comfort Ratio
12.05
lightweight racing boat
Capsize Screening
2.24
better suited for coastal cruising

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