This paper discusses fishermen who have modified fishing vessels to get a greater number of captures, so that the technical requirements of the ship are not met. Catamaran hull shape has a wider deck surface and has a good level of safety. The purpose of this study is to analyze the stability of fishing vessels when operating. The method used is ship basic data and optimization methods using maxsurf software. The results showed the stability curve area at a heeling of 0° -30°, 0° -40°, and 30° -40°, there was a reduction in the area from loadcase 1 to loadcase 3. The actual GM is above the minimum GM while the actual maximum GZ value occurs above the 10° heeling. All variable values of catamaran hull ship stability value meet the criteria in accordance with IMO A. 749 chapter 3regulations and High Speed Craft 2000 annex 7 Multihull.
At the end of 2016 public transport had only reached urban area of Samarinda, and it has not yet accessed the outskirt area of Samarinda. The lack of transportation connecting communities from each region is a problem. The purpose of this research was to design the inland waterways tranportation mode in the out skirt city of Samarinda. The used method was the trend curve and optimization approach. The results showed the principal dimension of ships had lenght over all (Loa) = 12.7 meters, draft (T) = 0.53 meters, the breadth of each hull (B) = 1.3 meters, the total breadth (BT) = 5.5 meters and height (H) = 1.6 meters, Cb = 0.54, Vs = 10 knots, Crew = 4 person, passenger = 36 person.
Penggunaan baja untuk menggantikan kayu Bitti sebagai bahan konstruksi gading kapal kayu dinilai tidak praktis karena melalui proses pembentukan dan pemeliharaan, sehingga penggunaan bahan lain seperti FRP sangat penting. Penelitian ini bertujuan untuk mengetahui ukuran dan bentuk penampang bahan FRP yang sesuai sebagai pengganti gading kayu ditinjau dari segi kekuatan. Metode yang digunakan yaitu elemen hingga (FEM) dan dianalisis menggunakan metode eksperimen numerik pada software. Penelitian ini bersifat kualitatif dengan mengoptimalkan bahan FRP dengan bentuk penampang I beam, I beam+flange, box of hole beam, T beam, dan U beam+flange sebagai pengganti bahan kayu Bitti. Hasil penelitian menunjukkan gading kayu Bitti memiliki elastisitas (E) = 9534.02 MPa dan momen inersia penampang (I) = 2197x104 mm4 terjadi tegangan maksimum (?k) = 7.682 N/mm2 dan lendutan maksimum (?) = 0.1 mm, untuk faktor keamanan gading kayu Bitti (Sf) = 1.28, sedangkan bahan FRP pengganti gading kayu dengan nilai (E) = 69000 MPa dapat digunakan penampang I beam dengan nilai I = 316x104 mm4, I beam+flange dengan nilai I = 288x104 mm4, box of hole beam dengan nilai I = 317x104 mm4, T Beam dengan nilai I = 478 x104 mm4, serta U beam+flange dengan nilai I = 375x104 mm4, terjadi tegangan maksimum (?k) = 52.00 N/mm2 dengan lendutan maksimum (?) < 0.082 mm dan faktor keamanan (Sf) = 1.28. Bahan FRP pengganti kayu gading membutuhkan momen inersia penampang sebesar 1/7~1/5 kali lebih kecil dari momen inersia penampang kayu gading dengan elastisitas tujuh kali lebih besar dari kayu gading. Nilai ini dapat dijadikan patokan untuk ukuran kapal di atas ataupun di bawah 70 GT ketika akan menggunakan bahan FRP sebagai pengganti gading kayu.
[ID] Banyak wisatawan yang berkunjung di Kepulauan Derawan, sebagian besar melakukan kegiatan penyelaman. Namun, jumlah kunjungan ini tidak diimbangi dengan sarana transportasi laut yang layak teknis dan layak laut. Tujuan penelitian ini yakni menemukan data-data berupa ukuran utama, rencana garis, dan rencana umum desain kapal katamaran. Metodelogi yang digunakan dalam penelitian ini yakni dengan Trend Curve Approach dan optimasi desain dengan software Maxurf Modeler Advanced. Hasil penelitian yang didapat adalah ukuran utama kapal dengan rincian sebagai berikut; L = 21m, B =10m, B1 =2.4m, H = 5m, T = 2m, Vs = 10 knot, Cb = 0.33, Daya Mesin = 86 HP (Untuk 1 Mesin), Jumlah Penumpang dan Kru = 87 Orang. [EN] Many tourists visiting the Derawan Islands, most do diving. However, the number of visits is not balanced with the means of sea transportation that is technically feasible and seaworthy. The purpose of this study was to find data in the form of main dimention, lines plan, and general arragement for the design of glass bottom catamaran vessels. The methodology used in this study is the Trend Curve Approach and design optimization with Maxurf Modeler Advanced software. The results of the research obtained are the main size of the ship obtained as follows; L = 21m, B = 10m, B1 = 2.4m, H = 5m, T = 2m, Vs = 10 knots, Cb = 0.33, Engine Power = 86 HP (For 1 Machine), Number of Passengers and Crew = 87 Persons.
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