For the past three years LAMP has b

For the past three years LAMP has been the fortunate beneficiary of the Institute for Maritime History and its driving force, David Howe. Mr. Howe owns a workboat which has transited to Florida each summer to become the primary support platform for LAMP's offshore operations. The boat is hope-ported in Tall Timbers, Maryland, approximately sixteen miles up the Potomac River from the Chesapeake Bay. Roper is a 36 (10.97 m) steel hulled boat originally built in 1990 as a shrimp trawler in New Bern, North Carolina. She is a seventeen gross-ton vessel drafting a five feet with a beam of twelve feet and is framed in steel and sheathed in 3/16 in. (.47 cm) steel plate. Powered by a Caterpillar 3208NA engine, she has the typical hard chine of a North Carolina-built trawler and cruises economically at 6.6 knots. Her work deck is plated in 3/16 (.47 cm) steel and buttressed underneath by .25 in. (.63 cm) steel deck beams and similar longitudinal stringers. In the center of the deck a coaming rises from the hold with a divided hatch cover to form a coffin-like deck box and hold access point. While smaller loads could be lowered into the hold, the safest place for twin cannon tubes was on deck, on either side of the deck box.
After much consideration of available resources, funds, and time, a swinging davit was decided upon to handle the upcoming loads. An a-frame was considered since this type of lifting device offers more athwartships stability in rolling seas but was considered too bulky and expensive to install since the relative small size of the vessel would have been consumed by the bulk of a frame. The additional weight of an a-frame would also add substantial weight aloft and may cause the vessel to be unnecessarily tender. Similarly, since Roper has the vestiges of her upperworks from trawling, it was thought to add a center pivoting boom for lifting. However, without an excessively long boom, lifting would have to take place exclusively over the side, an inherently more unstable operation, and so this option was discarded. During the 2010 yard period, a light duty lifting davit was attached to Roper's port quarter to handle loads of up to 300 pounds (136.3 kg). After much use in recovering heavy concretions the location of the davit and its performance was satisfactory enough to warrant adding a heavier davit. After some searching a pair of dock davits were located which each were rated to 3,500 pounds (1,590 kg) and had been used as a boat lift. While available for a very economical price, they has to be removed from the dock and carefully loaded since each davit weighted an approximate 400 pounds (181.8 kg). In February of 2011 Roper made her way up the Patuxent River, breaking ice much of the way, to retrieve the davits and have them ready for installation during the 2011 haulout and refit.

Hasil (Bahasa Indonesia) 1:

Selama tiga tahun lampu telah beruntung penerima manfaat Institut sejarah maritim dan motor penggerak, David Howe. Tn. Howe memiliki workboat yang telah transited ke Florida setiap musim panas untuk menjadi platform utama dukungan untuk lampu operasi lepas pantai. Perahu harapan-porting di Tall Timbers, Maryland, sekitar enam belas mil menyusuri Sungai Potomac dari Chesapeake Bay. Roper adalah 36 (10.97 m) baja dikuliti perahu awalnya dibangun pada tahun 1990 sebagai pukat udang di New Bern, North Carolina. Dia tujuh belas bruto-ton kapal penyusunan kaki lima dengan sinar dua belas kaki dan dibingkai dalam baja dan menyarungkan dalam 3/16 in. (.47 cm) baja pelat. Didukung oleh mesin 3208NA Caterpillar, dia memiliki chine keras khas dari pukat dibangun North Carolina dan cruises ekonomi di 6.6 knot. Pekerjaan geladak berlapis baja (.47 cm) 3/16 dan ditopang di bawah oleh.25 in. (.63 cm) dek baja balok dan longeron longitudinal yang serupa. Di pusat dek coaming naik dari memegang dengan penutup dibagi menetas untuk membentuk kotak seperti peti mati dek dan memegang titik akses. Sementara beban kecil bisa diturunkan ke palka, tempat teraman untuk kembar meriam tabung adalah di dek, di kedua sisi kotak dek. Setelah banyak pertimbangan sumber daya yang tersedia, dana, dan waktu, davit berayun diputuskan untuk menangani beban mendatang. Bingkai dianggap karena jenis perangkat mengangkat menawarkan lebih athwartships stabilitas di majalah rolling laut tetapi dianggap terlalu besar dan mahal untuk menginstal sejak ukuran relatif kecil kapal akan telah dikonsumsi oleh sebagian besar bingkai. Berat tambahan bingkai juga menambahkan substansial berat aloft dan dapat menyebabkan kapal untuk menjadi tidak perlu lembut. Demikian pula, karena Roper memiliki sisa-sisa upperworks nya dari trawl, ia berpikir untuk menambahkan sebuah pusat pivoting booming untuk mengangkat. Namun, tanpa ledakan terlalu lama, mengangkat harus mengambil tempat secara eksklusif atas sisi, operasi secara inheren tidak stabil, dan jadi pilihan ini dibuang. Selama periode 2010 halaman, tugas ringan yang mengangkat davit melekat Roper di pelabuhan kuartal untuk menangani beban hingga 300 pound (136.3 kg). Setelah banyak digunakan dalam memulihkan berat concretions lokasi davit dan kinerja itu cukup memuaskan untuk menjamin menambahkan lebih berat davit. Setelah beberapa mencari sepasang dermaga Derek telah terletak yang masing-masing dinilai untuk 3.500 pound (1.590 kg) dan telah digunakan sebagai perahu lift. Sementara tersedia untuk harga yang sangat ekonomis, mereka harus dihapus dari dermaga dan dimuat dengan hati-hati karena setiap davit tertimbang perkiraan 400 pound (181.8 kg). Pada bulan Februari 2011 Roper membuat nya naik Patuxent River, melanggar es banyak jalan, mengambil derek dan memilikinya siap untuk instalasi selama 2011 haulout dan mereparasi.