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

Adi Kurniawan Yusim†, Aulia Windyandari†*, Eko Julianto Sasono†, Hartono† & Ahmad Fauzan Zakki‡

†Vocational School, Industrial Technology Department, Central Java, Diponegoro University, Indonesia

‡Faculty of Engineering, Naval Architecture Department, Central Java, Diponegoro University, Indonesia

*Corresponding Author Email: [email protected]

This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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.