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Download Glass Reinforced Plastics by Brian Parkyn (Eds.) PDF

By Brian Parkyn (Eds.)

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The lifeboat is to be loaded incrementally and measurements at full load, 25, 50, 75 and 100 per cent overloads should be recorded as follows: (i) Deflection of keel amidships. (ii) Change in length as measured between top of stem and stern posts. 87 Area in 2 NOTE: K — Vertical height of section NOTE: Gunwale section area allows for a f in. dia. O. T. survey of lifesaving appliances supplement No. 1. 163 ft - 1 4 4 . 5 ton/in 2 Stress in keel:. ". ·. '. 10 cwt,L — 27 ft BM = W x Ζ,/6 = (164 x 27)/6 = 730 cwt ft Position of actual NA about assumed NA{h) — AT/area.

For this reason also there does not seem to be a case for using epoxy resins in preference to polyesters. The corrosion and weathering resistance of GRP are naturally advantageous in boat hull construction, this being particularly so in the case of ships' lifeboats. These are subjected to heavy marine atmosphere weathering and intermittent industrially polluted environments with only minimum maintenance. Needless to say, for these reasons GRP is almost exclusively used today for constructing ships' boats.

Usually the 'egg box' is made u p of marine grade mahogany plywood. This is fitted to the boat bottom and simply 'glassed in' using in situ laminating with polyester or epoxy resin and glass Boat Hulls 39 fibre strips. By completely laminating on to the surface of one or more of the compartments thus formed, built in fuel and water tanks can be very easily m a d e . Machinery and other fittings can then be attached in a conventional way to the wooden structure. Needless to say such a structure can be m a d e in any suitable material, steel, aluminium or G R P and fitted to the G R P hull in the same way.

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