Pearson Lark
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24 - Same hull different deck? 
First Year 1966   Main Area  173   Hull Speed  5.76
Last Year  1968   For Tri    139   SA/D        18.9
LOA        24.0   I         29.3   D/L          303
LWL        18.5   J          9.5   BR           42%
Beam        8.0   P         31.0   L/B         3.00
Disp      4,300   E         11.2   LWL /B      2.31
Draft       4.0   Eng         OB   OR           23%
Sail Area   312                    CSF         1.97
Ballast   1,800                    MCR         20.5
                                   M/F         1.25
                                   PHRF         255
Info on Design Ratios
1967

1967

1967

original brochure specs:

LOA = 24', LWL = 18'6", Beam = 8', Draft = 4'. Ballast + 1800#, Displacement
= 4300#, Sail area = 283 sq. ft. ( 144 sq. ft. main and 139 sq. ft. 100%
fore triangle), MORC Rating = 20.0 est.

I also got a blueprint of the sail plan:
P2 = 29'-3". P = 25'-9"
B = 11'-2"
J = 9'-6"
Schrouds = 3/16" dia. 1x19
Stays = 3/16" dia. 1x19
Running rigging 7 x 19 ss and dacron (we replaced these halyards with 5/16
nylon only) 

Main Sail leech = 27'-8", area = 144 sq. ft.
#! Genoa: Luff 29'-3", Leach = 28'-3", Foot = 15'-11", area = 220 sq. ft.
#2 genoa: Luff 26'-6", Leach = 25'-9", Foot = 15'-2.5", area = 190 sq. ft.
(remarks column for #2 genoa: 33"Lg. Head Pendt.)
Working Jib: Luff 26'-6", Leach = 23'-5", Foot = 9'-10", area = 114 sq. ft.
(remarks column for Working Jib: 33"Lg. Head Pendt.)
Roller Furling: Luff 28'-2", Leach = 27'-8", Foot = 15'-2" (handwritten in)
Spinnaker: LUFF = C, LEACH = C, FOOT = A, Area = Max.