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LUDERS 21 built by Ron Rawson Inc./ American Plastics Inc. (USA) and designed by A. E. Luders. Her first hull was built in 1967 with an overall lengh of 6.48 m or 21.25 ft long

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LUDERS 21 Sailboat Specifications​


Overall Length (LOA) m / ft6.48 m / 21.25 ft
Builder(s)Ron Rawson Inc. / American Plastics Inc.
Designer(s)A. E. Luders
CountryUnited States
Hull TypeFin Keel w/bulb
First Hull Built1967
Rigging TypeFractional Sloop
Ballast Ratio29


Overall Length (LOA) 6.48 m / 21.25 ft
Waterline Length (LWL)4.88 m / 16.00 ft
Beam (width)1.70 m / 5.58 ft
Draft0.91 m / 3.00 ft
Light Displacement (MLC) 680 kg / 1500 lb
Maximum Displacement680 kg / 1500 lb
Ballast Weight197 kg / 435 lb


Capsize Screening Formula (CSF)1.95
Comfort Ratio13.34
Displacement-Length Ratio (DLR)163.49
Ballast Ratio29
Sail Area to Displacement17.01

Above Deck

Estimated Forestay Length5.74 m / 18.82 ft
Reported Sail Area12.91 m² / 139.00 ft²
Total Sail Area12.84 m² / 138.19 ft²
Mainsail Area8.24 m² / 88.69 ft²
I18.00 ft * 5.49 m
J5.50 ft * 1.68 m
P21.50 ft * 6.55 m
E8.25 ft * 2.51 m
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