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All Journal Department of Naval Architecture Journal La Lifesci
Adhi Paska, Adhi
Teknik Perkapalan, Fakultas Teknik, Universitas Diponegoro - Semarang
Agriculture, Biological Sciences & Forestry Chemistry Civil Engineering, Building, Construction & Architecture Earth & Planetary Sciences Environmental Science Immunology & microbiology

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ANALISA ENGINE PROPELLER MATCHING PADA KAPAL PERINTIS BARU TYPE 200 DWT UNTUK MEDAPATKAN SISTEM PROPULSI YANG OPTIMAL Paska, Adhi; Hadi, Eko Sasmito; Kiryanto, Kiryanto
Jurnal Teknik Perkapalan Vol 4, No 3 (2016): Juli
Publisher : Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (905.977 KB)

Abstract

Kapal Perintis 200 DWT adalah kapal yang beroperasi di wilayah Kepulauan Seribu, Jakarta. Kapal tersebut mengalami modifikasi pada bentuk lambung kapal yang dimaksudkan agar bentuk lambung baru dapat meningkatkan performa sistem penggerak kapal dari bentuk lambung sebelumnya. Perhitungan untuk menentukan sistem penggerak yang optimal dapat dilakukan dengan menghitung tahanan kapal, daya mesin yang sesuai dengan tahanan tersebut, hingga menentukan karakteristik propeller rekomendasi. Karakteristik propeller diantaranya Ae/Ao, Diameter propeller, Pitch dan lain – lain. Adapun karakteristik lainnya seperti Koefisien Advance (J), Pitch Ratio (P/D) ditentukan dengan variasi dari nilai 0,5 hingga 1,4. Dengan karakteristik tersebut dapat dihasilkan kt, kq, effisiensi, serta daya dan kecepatan propeller. Dari perhitungan didapatkan spesifikasi mesin rekomendasi Kapal Perintis 200 DWT lambung baru yaitu Caterpillar C18 Alert dengan daya 500 kW dan kecepatan 2100 rpm. Sedangkan karakteristik propeller yang optimal adalah dengan Ae/Ao = 0,600 ; P/D = 0,8 ; J = 0,5. Dan dari grafik Matching Point diketahui bahwa Matching Point kapal dengan modifikasi bentuk lambung baru lebih baik dari kapal dengan bentuk lambung lama.
Tensile and Flexural Strength Fiberglass Mixed Green Mussel Shell Powder for Fishing Vessel Size below 5 GT Paska, Adhi; Yusrizal, Yusrizal; Hermawan, Maman; Idnillah, Mochamad
Journal La Lifesci Vol. 6 No. 2 (2025): Journal La Lifesci
Publisher : Newinera Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37899/journallalifesci.v6i2.2163

Abstract

Green mussel (Perna viridis) is a marine organism that is widely cultivated and considered a leading commodity in the fisheries sector. The increase in mussel production has resulted in a significant amount of shell waste. Improperly managed mussel shell waste can have a negative impact on the environment. However, green mussel shell waste has great potential for reuse, one of which is as a composite material in fiberglass manufacturing. The high calcium content in mussel shells can serve as an additional reinforcement in fiberglass composites. The wood crisis as a raw material for boat construction, which also contributes to environmental deforestation, has led to the consideration of alternative materials such as fiberglass for boat building. This research is an experimental study on the utilization of green mussel shell (GMS) waste as a fiberglass mixture material for boat construction. An ideal composition between the GMS waste powder and fiberglass material is expected to enhance the mechanical strength of fiberglass fishing boats. The study shows that the addition of 20% GMS powder in fiberglass lamination improves mechanical properties, with a maximum tensile stress value of 113.23 MPa. Meanwhile, the maximum flexural strength is observed at 15% GMS powder composition, reaching 192.38 MPa. The addition of GMS powder has the potential to strengthen fiberglass, making it suitable for applications such as fishing boat hulls. However, adding more than 30% GMS powder decreases the material’s strength, particularly in tensile testing. Further research is needed to explore the use of GMS powder for waste reduction and to provide insights into its applications in fiberglass boat manufacturing.
Co-Authors Eko Sasmito Hadi Idnillah, Mochamad Kiryanto Kiryanto Maman Hermawan Yusrizal Yusrizal