ALPA 21

ALPA 21 drawing

Sailboat Specifications


Hull Type:
Fin w/transom hung rudder
Rigging Type:
Masthead Sloop
LOA:
21.25 ft / 6.48 m
LWL:
18.60 ft / 5.67 m
S.A. (reported):
245.00 ft2 / 22.76 m2
Beam:
8.16 ft / 2.49 m
Draft (max):
4.00 ft / 1.22 m
Draft (min):
Displacement:
2,868 lb / 1,301 kg
Ballast:
800 lb / 363 kg
S.A./Disp.:
19.47
Bal./Disp.:
27.89
Disp./Len.:
198.97
Construction:
FG
Ballast Type:
First Built:
1976
Last Built:
# Built:
Builder:
Alpa (ITA)
Designer:
Sparkman & Stephens
Website:

Sailboat Calculations

S.A./Disp.:
19.47
Bal./Disp.:
27.89
Disp./Len.:
198.97
Comfort Ratio:
13.95

Rig and Sail Particulars

I:
30.00 ft / 9.14 m
J:
8.55 ft / 2.61 m
P:
26.00 ft / 7.92 m
E:
9.00 ft / 2.74 m
SPL/TPS:
ISP:
S.A. Fore:
128.25 ft2 / 11.91 m2
S.A. Main:
117.00 ft2 / 10.87 m2
S.A. Total (100% Fore + Main Triangles)
245.25 ft2 / 22.78 m2
S.A./Disp. (calc.):
19.49
Est. Forestay Len.:
31.19 ft / 9.51 m

Sailboat Links

Notes

S&S design #2204.



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