Study of Hullform Low Wash Catamaran Water Bus Design to Support Transportation Needs from Small IslandsStudy of Hullform Low Wash Catamaran Water Bus Design to Support Transportation Needs from Small Islands

The purpose of this study is to designed the low wash hull on catamaran vessels to support transportation on the small islands of the Karimunjawa Islands, and to observed the results of waves generated from the shape of the hull. Using the regression method of the comparison ship, the main size of the catamaran ship is obtained LoA = 20.9 m, LwL = 20 m, B = 8 m, H = 3.1 m, T = 1.6 m. Hullform designed with 4 forms: Model 1 (symmetrical), Model 2 (symmetrical variation), Model 3 (flat side outside of asymmetric catamaran), and Model 4 (flat side inside of asymmetric catamaran). The results obtained that a symmetrical hull catamaran is the ship that has the smallest resistance i.e. model 2 S/L 0.3. At Fn 0.28 the resistance is 2.37 N, Fn 0.47; 4.85 N, and Fn 0.65; 5.71 N. Vessels with asymmetric flat hulls outside have the lowest wave elevation as well as low wash are model 3 with S/L 0.3 with elevation height from 0 to 1 point of 0.012264.