Sailboat Specifications
Hull Type:
Keel/Cbrd.
Rigging Type:
Masthead Yawl
LOA:
37.75 ft / 11.51 m
LWL:
25.00 ft / 7.62 m
Beam:
10.58 ft / 3.22 m
S.A. (reported):
558.00 ft2 / 51.84 m2
Draft (max):
7.70 ft / 2.35 m
Draft (min):
4.50 ft / 1.37 m
Displacement:
15,000 lb / 6,804 kg
Ballast:
5,650 lb / 2,563 kg
S.A./Disp.:
14.73
Bal./Disp.:
37.67
Disp./Len.:
428.57
Construction:
FG
Ballast Type:
Lead
First Built:
1960
Last Built:
1965
# Built:
21
Builder:
Pearson Yachts (USA)
Designer:
William Tripp
Auxiliary Power/Tanks (orig. equip.)
Make:
Universal
Model:
Atomic 4
Type:
Gas
HP:
20
Fuel:
25 gals / 95 L
Sailboat Calculations
S.A./Disp.:
14.73
Bal./Disp.:
37.67
Disp./Len.:
428.57
Comfort Ratio:
34.74
Capsize Screening Formula:
1.72
S#:
0.89
Rig and Sail Particulars
I:
38.50 ft / 11.73 m
J:
15.20 ft / 4.63 m
P:
33.00 ft / 10.06 m
E:
16.10 ft / 4.91 m
PY:
16.00 ft / 4.88 m
EY:
8.20 ft / 2.50 m
S.A. Fore:
292.60 ft2 / 27.18 m2
S.A. Main:
265.65 ft2 / 24.68 m2
S.A. Total (100% Fore + Main Triangles)
558.25 ft2 / 51.86 m2
S.A./Disp. (calc.):
14.74
Est. Forestay Len.:
41.39 ft / 12.62 m
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Notes
The first 2 boats, based on this design, were built by Palmer Johnson. (1959). It is thought that Pearson purchased the molds from them and extended the LOA by 1'8", though this is disputed by some. This flush deck version was superseded, in 1964, by the INVICTA II with a standard coach roof. (Thanks to Nanette Blish, and Dave Bricker, both former INVICTA owners, for supplying updated information on this model.)
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