Cal's Evals » LEOPARD 38 - MOORINGS 3800

Release Date: 12/22/2010

Cals Eval Leopard 38 This catamaran, also called the Moorings 3800, is made by Robertson and Caine in South Africa. It is a charter cat design, relatively heavy for a boat its size, but possessing a large sail area. Average values [in brackets] for 68 cruising catamarans in the 35-37 foot waterline length range are used for evaluating this boat. The Leopard 38 numbers are: Displacement: 8.83 tons [average 5.26 tons (range is 2.25 to 9.7)] Length Overall: 37.50 feet [average 38.05 feet (range is 35 to 43)] Length at Waterline: 36 feet [average 35.8 feet (range is 35.0 to 36.83)] Beam Overall: 19.75 feet [average 21.16 feet (range is 16.37 to 27.1)] Beam between hull centerlines: 14.87 ft. [average 16.99 ft. (range is 13.93 to 22.99)] Sail Area (Main plus 100% fore-triangle): 991 sq. ft. [778 sq. ft. (range is 540 to 1086)] Sail Area/Displacement Ratio: 21.68 [25.35 (range is 14.38 to 41.68)] Bridgedeck Clearance (Unknown) [29 in. is nominal for 37 ft. LWL catamarans] Lwl/Bh ratio: 7.38 [9.93 (range is 6.49 to 14.23)] Base Speed: 9.47 knots [10.01 (range is 8.13 to 12.64)] Texel Rating: 137 [128 (range is 91 to 163)] Bruce Number: 1.17 [1.25 (range is 0.95 to 1.62)] Stability Speed: 18.18 knots [19.33 (range is 12.37 to 28.29)] Kelsall Stability Speed: 30.58 knots [32.52average (range is 20.81 to 47.59)] The Leopard 38 is a heavy boat. The over-average sail area does not make up for the displacement as shown in the SA/D ratio. The result is the lower than average Base Speed. Furthermore, the Lwl/Bh ratio of 7.38 is well below the trend line and may indicate a tendency to build significant bow waves that would be speed limiting and potentially produce wave interference between the hulls under the bridgedeck. Its stability is lower than average despite the large displacement because of the relatively narrow spacing of the hull centerlines. All indications are that this boat is designed for cruising. The boat has low-aspect ratio keels and skeg-hung rudders. The comparatively wide hulls would be amenable to overloading than one of the slimmer catamarans. Calvin H. Markwood Engineering Analyst Multihull Dynamics, Inc. Contact Cal: multihull.analysis@comcast.net