• Muhammad Iqbal Departemen Teknik Perkapalan, Fakultas Teknik, Universitas Diponegoro
  • Parlindungan Manik Diponegoro University
  • Eko Sasmito Hadi Diponegoro University
  • Achmad Kurniawan Diponegoro University
Keywords: Hambatan, Katamaran, Centerbulb, Foil, CFD


Catamarans are double hull ships which have many advantages over single hull ships with the same displacement. To increase catches, fishermen in Cilacap converted ships from the original single hull with outrigger to double hull (catamaran). Displacement of ships has doubled. But the ship's resistance increased to almost 4 times. To reduce the resistance of catamarans, some researchers use the concept of center bulb. In this study, the center bulb form used foil. The purpose of this study was to determine the effect of center bulb position on ship resistance components by comparing 9 center bulb positions. The results stated that of the nine center bulb position configurations, Model 6 is the best model because at Fr 0.35 it can reduce ship resistance by up to 33%. For the viscous resistance component it is not significantly affected by the use of the center bulb. But on the wave resistance component, the use of this center bulb can reduce wave resistance by 47% at Fr 0.35.


Download data is not yet available.


M. S. Seif dan E. Amini, “Performance Comparison Between Planing Monohull and Catamaran at High Froude Numbers,” Iranian Journal of Science & Technology, vol. 28, no. B4, 2004.

F. Zouridakis, “A Preliminary Design Tool for Resistance and Powering Prediction of Catamaran Vessels,” Master Thesis Massachusetts Institute of Technology. Dept. of Ocean Engineering. , 2005.

Samuel, M. Iqbal dan I. K. A. P. Utama, “An Investigation Into The Resistance Components Of Converting A Traditional Monohull Fishing Vessel Into Catamaran Form,” International Journal of Technology, vol. 6, no. 3, pp. 432-441, 2015.

M. Iqbal dan Samuel, “Traditional Catamaran Hull Form Configurations That Reduce Total Resistance,” International Journal of Technology, vol. 8, no. 1, pp. 989-997, 2017.

M. Iqbal dan G. Rindo, “Optimasi Bentuk Demihull Kapal Katamaran Untuk Meningkatkan Kualitas Seakeeping,” KAPAL : Jurnal Ilmu Pengetahuan dan Tekologi Kelautan, vol. 12, no. 1, pp. 19-24, 2015.

D. Bruzzone, A. Grasso dan I. Zotti, “Nonlinear Seakeeping Analysis of Catamarans with Central Bulb,” Naples, 2008.

I. Zotti, “Medium Speed Catamaran with Large Centralbulbs: Experimental Investigation on Resistance and Vertical Motions,” Naples, 2007.

G. K. Saha, K. Suzuki dan H. Kai, “Hydrodynamic Optimization of a Catamaran Hull With Large Bow and Stern Bulbs Installed on the Center Plane of the Catamaran,” Journal of Marine Science and Technology, vol. 10, pp. 32-40, 2005.

D. B. Danisman, “Reduction of Demi-Hull Wave Interference Reistance in Fast Displacement Catamarans Utilizing an Optimized Centerbulb Concept,” Ocean Engineering, vol. 91, pp. 227-234, 2014.

M. Insel dan A. F. Molland, “An Investigation into the Resistance Components of High Displacement Catamarans,” Transaction Royal Institutions of Naval Architevture, vol. 134, 1992.

A. F. Molland, A Guide to Ship Design, Construction and Operation, The Maritime Engineering Reference Book, Butterworth- Heinemann, Elsevier, 2008.

A. Jamaluddin, I. K. A. P. Utama, B. Widodo dan A. F. Molland, “Experimental and Numerical Study of the Resistance Component Interactions of Catamarans,” Proceedings of the Institution of Mechanical Engineers, Part M: Journal of Engineering for the Maritime Environment , vol. 227, no. 1, pp. 51-60, 2012.

S. A. Harvald, Resistance and Propulsion of Ships, New York : Wiley, 1983.