Perancang kapal berusaha untuk memperoleh stabilitas dan seakeeping yang baik terlebih untuk kapal cepat bertipe planning hull. Tipe ini memiliki deadrise sehingga lambungnya bentuk ‘V’ sehingga tujuan penelitian ini adalah untuk mengetahui pengaruh besar sudut deadrise terhadap stabilitas dan seakeeping. Objek penelian adalah kapal planning hull Series 62: parent model 4677-1. Metode penelitian menggunakan simulasi komputer dengan bantuan software dan perhitungan stabilitas tersebut dibandingkan dengan metode Krylov II. Hasil penelitian menyatakan bahwa tiga variasi deadrise yaitu 10°, 13°, dan 18°, sudut deadrise yang kecil memberikan stabilitas yang baik tetapi mengurangi olah gerak kapal (seakeeping) sedangkan sudut deadrise yang besar akan mengurangi kemampuan stabilitas kapal tetapi memiliki seakeeping yang baik. Ketiga model tersebut sama-sama memenuhi regulasi stabilitas IMO. Sehingga besar sudut deadrise yang direkomendarikan untuk penelitian ini adalah 13°.

Renewable energy technology has been developed to reduce use of fossil energy. It has two advantages namely environmentally friendly and renewable. For example the use of marine current as a source of electricity by using a turbine. Several studies have been done to improve performance of turbine, for example the use of a duct. The duct amis to reduce torque ripple so that power does not have high fluctuations that result in excessive vibration in the turbine. Therefore the subject of this study is how the effect duct on Darrieus-Savonius combination turbine to reduce torque ripple factor (TRF) with the analysis of CFD. The simulation was performed on duct type 1, 2 and without duct with result of TRF is 3,939; 3,489 and 4,930. The conclusion that the use of duct on turbine can decrease torque ripple, where type 2 produces a smaller TRF namely, 3.489.

Projected temperature that will be felt by world community will increase 7.5°C hotter in 2070, meaning that world community is threatened to live in extreme temperatures an average of 34°C in next 50 years. This prediction can occur if a reduction in greenhouse gas emissions fails to be carried out simultaneously. On or hand, impact of soaring crude oil prices on world market has been felt by all walks of life so it is necessary to create alternative solutions to dependence of fuel to get through difficult times. In sea transportation sector, use of fuel for motorized ships is not only uneconomical but also not environmentally friendly. Dependence on fossil fuel energy has led to development of energy-efficient ship concepts that use alternative energy sources in moving ships. This is anticipated by use of solar energy in form of Electricalboats (Eb) which are applied as fishing vessels. This paper presents a study of efficient use of solar energy in Eb as a boat driver that does not utilize fuel for development of environmentally friendly fishing vessels. Technical analysis is done through testing ship model in Towing Tank n results are explored with Naval Architect ories. In conclusion, there is a potential for fuel consumption savings of up to 90% when compared to ships that only use conventional engines.

Wooden hulls have been damaged and overgrown by fouling have negative impact on the service life and also increase the resistance of ship thereby increasing fuel consumption. Therefore the ship have to repaired regularly. The problem discussed is how to repair wooden ships such as replacing plank, cleaning hull and coating; and hull analysis to determine resistance of ship. Therefore the object of this paper is to repair wooden ships and analysis of the hull. The method used is training that is followed by demonstration and also science and technology simulation that explains the form hull and resistance of the ship with use of software Maxsurf. The result is replacement plank on the keel, and the side; clean the hull, putty and coating. The ship is measured and the main dimension is obtained and then makes line plans and 3D ship models. The calculation of the ship's resistance shows that ship use main engine Honda GX 160 with 5.5 hp will produce 6.325 knots.ABSTRAKKondisi lambung kapal kayu yang rusak dan ditumbuhi biota laut (fouling) berdampak negatif pada umur pakai kapal dan juga menambah tahanan kapal sehingga meningkatkan konsumsi bahan bakar. Oleh karena itu kapal harus diperbaiki secara berkala. Permasalah yang diselesaikan adalah bagaimana reparasi kapal kayu seperti penggantian papan kayu, pembersihan lambung, pengecatan dan juga analisa bentuk lambung kapal kayu untuk mengetahui tahanan kapal kayu. Sehingga tujuan penulisan ini adalah melakukan reparasi kapal kayu dan juga analisa lambung kapal. Sendangkan metode penelitian yang digunakan adalah adalah pelatihan yang diikuti demonstrasi dan juga simulasi ipteks yang menjelaskan bentuk lambung dan tahanan kapal dengan bantuan software Masurf. Kapal yang reparasi dilakukan pergantian papan pada lunas kapal, dan sisi kapal, pembersihan lambung, pendempulan dan pengecatan. Selanjutnya dilakukan pengukuran kapal untuk mendapatkan ukuran utama dan pembuatan gambar rencana garis dan model kapal 3D. Pada perhitungan tahanan kapal dengan menggunakan motor penggerak Honda GX 160 dengan daya 5,5 HP akan menghasilakan kecepatan 6,325 knot.