ROCK 20

Sailboat Specifications


Hull Type:
Fin with rudder on skeg
Rigging Type:
Masthead Sloop
LOA:
23.52 ft / 7.17 m
LWL:
19.52 ft / 5.95 m
S.A. (reported):
217.00 ft2 / 20.16 m2
Beam:
7.38 ft / 2.25 m
Draft (max):
3.94 ft / 1.20 m
Draft (min):
Displacement:
3,858 lb / 1,750 kg
Ballast:
1,323 lb / 600 kg
S.A./Disp.:
14.15
Bal./Disp.:
34.29
Disp./Len.:
231.57
Construction:
FG
Ballast Type:
Iron
First Built:
1968
Last Built:
1975
# Built:
200
Builder:
Birka Marine (FIN)
Designer:
Heinz-Jurgen Sass
Website:

Sailboat Calculations

S.A./Disp.:
14.15
Bal./Disp.:
34.29
Disp./Len.:
231.57
Comfort Ratio:
20.07

Rig and Sail Particulars

I:
25.60 ft / 7.80 m
J:
9.02 ft / 2.75 m
P:
23.23 ft / 7.08 m
E:
8.73 ft / 2.66 m
SPL/TPS:
ISP:
S.A. Fore:
115.46 ft2 / 10.73 m2
S.A. Main:
101.40 ft2 / 9.42 m2
S.A. Total (100% Fore + Main Triangles)
216.85 ft2 / 20.15 m2
S.A./Disp. (calc.):
14.14
Est. Forestay Len.:
27.14 ft / 8.27 m

Sailboat Links

Designers:
Builders:

Notes

Another version called the ROCK 24 is probably based on the same hull but with a different sail plan.



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