Measurements made from the 1/4 scale model then calculated up to a full sized Optimist dinghy.
The model was made using the original 1948 Clark Mills plans to build with standard 8 foot long plywood sheets.


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Opti_Model_bottom_width.xls




calculated from Metric




.25 scale .25 scale
Full scale Full scale
Full scale Full scale


station decimal inch half breadth
half breadth full breadth
full breadth full breadth
inch
inch half width Inch millimeters
millimeters millimeters
inches Nearest 1/16
0
in. 00 2.39 61.3
245.2 490.4
19.307 19 3/8” bow transom
1
in. 01








2
in. 02








3
in. 03 2.63 69.0
276.0 552.0
21.732 21 3/4”
4
in. 04








5
in. 05








6
.in 06 2.89 73.3
293.2 586.4
23.087 23”
7
in. 07








8
in. 08








9
in. 09 3.12 79.2
316.8 633.6
24.945 24 15/16”
10
in. 10








11
in. 11








12
in. 12 3.36 85.6
342.4 684.8
26.961 26“
13
in. 13








14
in. 14








15
in. 15 3.60 91.5
366.0 732.0
28.819 28 13/16”
16
in. 16








17
in. 17








18
in. 18 3.81 96.8
387.2 774.4
30.488 30 ½ “
19
in. 19








20
in. 20








21
in. 21 4.02 102.1
408.4 816.8
32.157 32 1/8”
22
in. 22








23
in. 23








24
in. 24 4.21 106.8
427.2 854.4
33.638 33 5/8”
25
in. 25








26
in. 26








27
in. 27 4.35 111.1
444.4 888.8
34.992 34”
28
in. 28








29
in. 29








30
in. 30 4.52 114.8
459.2 918.4
36.157 36 1/8”
31
in. 31








32
in. 32








33
in. 33 4.65 117.9
471.6 943.2
37.134 37 1/8”
34
in. 34








35
in. 35








36
in. 36 4.74 120.7
482.8 965.6
38.016 23”
37
in. 37








38
in. 38








39
in. 39 4.85 123.0
492.0 984.0
38.740 38 3/4”
40
in. 40








41
in. 41








42
in. 42 4.91 124.9
499.6 999.2
39.339 39 5/16”
43
in. 43








44
in. 44








45
in. 45 4.96 126.1
504.4 1008.8
39.717 39 11/16”
46
in. 46








47
in. 47








48
in. 48 5.00 127.0
508.0 1016.0
40.000 40”
49
in. 49








50
in. 50








51
in. 51 5.00 126.9
507.6 1015.2
39.969 40”
52
in. 52








53
in. 53








54
in. 54 5.00 127.4
509.6 1019.2
40.126 40 1/8”
55
in. 55








56
in. 56








57
in. 57 4.98 126.6
506.4 1012.8
39.874 39 3/4”
58
in. 58








59
in. 59








60
in. 60 4.92 125.4
501.6 1003.2
39.496 39 1/2”
61
in. 61








62
in. 62








63
in. 63 4.87 122.8
491.2 982.4
38.677 38 11/16”
64
in. 64








65
in. 65








66
in. 66 4.77 121.5
486.0 972.0
38.268 38 5/16”
67
in. 67








68
in. 68








69
in. 69 4.74 120.6
482.4 964.8
37.984 38”
70
in. 70








71
in. 71








72
in. 72 4.64 118.0
472.0 944.0
37.165 37 3/16”
73
in. 73








74
in. 74








75
in. 75 4.57 115.7
462.8 925.6
36.441 36 7/16”
76
in. 76








77
in. 77








78
in. 78 4.47 113.3
453.2 906.4
35.685 35 11/16”
79
in. 79








80
in. 80








81
in. 81 4.39 111.4
445.6 891.2
35.087 35”
82
in. 82








83
in. 83








84
in. 84 4.30 109.2
436.8 873.6
34.394 34 3/8”
85
in. 85








86
in. 86 4.26 108.0
432.0 864.0
34.016 34” transom












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