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St Francis 50
Designer: Angelo Lavranos  ·  Builder: St Francis Marine (Rsa)  ·  First built: 2006
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About the St Francis 50

Designed by renowned South African naval architect Angelo Lavranos, this impressive catamaran represents a compelling blend of performance and comfort for serious offshore cruising. Built by St Francis Marine in South Africa starting in 2006, the design showcases the builder's expertise in creating robust multihulls capable of handling demanding ocean passages. The fractional sloop rig configuration provides excellent sail handling characteristics, while the substantial sail area of 1,550 square feet delivers impressive performance in light to moderate conditions. Her GRP construction with foam core sandwich ensures both strength and weight savings, crucial elements for any catamaran design. The relatively shallow 4.10-foot draft opens up countless anchorages and coastal cruising grounds that would challenge deeper-draft monohulls. Twin 54-horsepower engines provide reliable auxiliary power and excellent maneuverability in tight quarters or challenging conditions. With her generous beam of over 26 feet, the design offers exceptional stability and interior volume, making extended offshore passages comfortable for crew and guests alike. This catamaran excels as a bluewater cruiser, combining Angelo Lavranos's reputation for seaworthy designs with the practical advantages of multihull sailing. Her specifications suggest a vessel well-suited for serious ocean voyaging while maintaining the comfort expected from a modern cruising catamaran.

Core Dimensions
LOA (Length Overall) 50.03 ft / 15.25 m
LWL (Waterline Length) 47.08 ft / 14.35 m
Beam 26.25 ft / 8.00 m
Max Draft 4.10 ft / 1.25 m
Displacement 27,557.78 lb / 12,500 kg
Sail Area (Reported) 1,550.00 ft² / 144.00 m²
Design & Construction
Hull Type Catamaran Twin Keel
Rigging Type Fractional Sloop
Construction GRP w/ foam core
Designer Angelo Lavranos
Builder St Francis Marine (RSA)
First Built 2006
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Performance Ratios
Comfort Ratio Ted Brewer's Comfort Ratio predicts how comfortable a boat will feel in offshore conditions. Higher values mean a steadier, more comfortable motion in a seaway.
Under 20 — Uncomfortably rough20–30 — Acceptable coastal30–40 — Good offshore comfortOver 40 — Very comfortable offshore
11.34
Capsize Screening Formula The USHS Capsize Screening Formula estimates offshore capsize risk. Lower is safer — values under 2.0 are considered acceptable for offshore sailing.
Under 2.0 — Safe for offshore2.0–2.2 — Borderline offshoreOver 2.2 — Coastal use recommended
3.48
Hull Speed Hull Speed is the theoretical maximum speed of a displacement hull, calculated from waterline length. Most cruising sailboats reach this speed in moderate conditions. 9.19 kn
Pounds/Inch Immersion Pounds per Inch Immersion (PPI) tells you how much weight is needed to sink the boat one inch. Useful for calculating how additional gear and stores affect waterline. 26.48 pounds/inch
Rig Dimensions
Mast Height (DWL) 70.60 ft / 21.52 m
Engine & Accommodations
Engine Make Yanmar
Engine Type Diesel, Saildrive
Horsepower 2x 54
Fuel Capacity 222 gals / 840 L
Water Capacity 357 gals / 1,350 L
KSP 0.81
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