Archive image from page 21 of Development of a spherical acrylic. Development of a spherical acrylic plastic pressure hull for hydrospace application . developmentofsph00stac Year: 1970 lifting sling rigid cage rib cage ring bolted onto the cage ribs sliding fit between pin and opening in cage ring rubber gasket ring with guide pins bolted onto the hatch ring acrylic plastic hull lifting slings in the capsule. Since a rigid attachment to the cage at both top and bottom steel inserts was undesirable, as it would restrain the sphere radially during pres- sure application, a special joint was
Archive image from page 21 of Development of a spherical acrylic. Development of a spherical acrylic plastic pressure hull for hydrospace application . developmentofsph00stac Year: 1970 lifting sling rigid cage rib cage ring bolted onto the cage ribs sliding fit between pin and opening in cage ring rubber gasket ring with guide pins bolted onto the hatch ring acrylic plastic hull lifting slings in the capsule. Since a rigid attachment to the cage at both top and bottom steel inserts was undesirable, as it would restrain the sphere radially during pres- sure application, a special joint was devised that permitted the sphere to change its radial dimen- sion but at the same time resisted lateral forces applied to the sphere by waves on the ocean surface, or currents when submerged. The joint devised for this application consisted basically of pins attached to the polar metal plates that fitted into oversize holes in the cage framework. Thus, the sphere was permitted to change its diametri- cal dimension while at the same time the pin and hole joint restrained the whole capsule from lateral or vertical displacement that would cause it to strike the ribs of the cage. The sliding pin joint imposes only lateral and ver- tical but not diametral restraint. Because of this, no external tensile loading can act on the capsule, regardless whether the NEMO system is being lifted out of water or just floating on the ocean sur- face. The drawback of this capsule attachment to the NEMO service module was that the cage did reduce to some extent the pan- oramic visibility of which an acrylic plastic capsule is capable. Because of it, this attachment arrangement would not be as satisfactory from the optical viewpoint as the tie-rod attachment. There was, however, a compensating feature to the cage. If the cage members were spaced appro- priately the cage could act as a protector against impacting the ship during launching operations. This protective feature of the cage was felt to
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Keywords: 1970, archive, book, bookauthor, bookdecade, bookpublisher, booksponsor, booksubject, bookyear, boston_library_consortium_member_libraries, drawing, historical, history, hulls_naval_architecture_, illustration, image, naval_civil_engineering_laboratory_port_hueneme_calif, page, picture, port_hueneme_calif_u_s_naval_civil_engineering_lab, print, reference, stachiw_jerry_d_1931_, submersibles, vintage
