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THUNDERBIRD
• Designed by Ben Seaborn
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General Information
Hull Type:
Fin w/spade rudder
Rigging Type:
Fractional Sloop
First Built:
1958
Dimensions
Length Overall (LOA):
7.92 m
Length Waterline (LWL):
6.17 m
Beam:
2.30 m
Draft (Max):
1.46 m
Weight & Ballast
Displacement:
1,656 kg
Ballast:
694 kg
Sail Plan
Foresail Area:
9.94 m²
Mainsail Area:
18.72 m²
Sail Area:
28.66 m²
Sail Area (reported):
28.71 m²
I (Fore Triangle Height):
8.15 m
J (Fore Triangle Base):
2.44 m
P (Mainsail Hoist):
9.45 m
E (Boom Length):
3.96 m
Est. Forestay Length:
8.51 m
Engine & Systems
Performance Ratios
Hull Speed:
6.03 knots
SA/Displacement (Calc):
20.88
SA/Displacement (Reported):
20.91
Ballast/Disp Ratio:
41.92%
Displacement/Length:
196.23
Comfort Ratio:
17.40
Capsize Screening:
1.96
S-Number:
3.19
Immersion:
97 kg/cm
Notes
Some THUNDERBIRDS have been built of molded FG with aluminum spars. A "cruising deck" design was introduced. Most have been built from plans now supplied by the class association. See the class web site for details.
Market Value
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