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Aviation History
1921
1921 - 0246.PDF
APRIL 7, 1921 Photo. No. 8.—N4. Complete hull in frame. Photo. No. 9 P5, showing planking and steps. of 30 ins., carefully joggled over the timbers and floors. (SeePhoto. No. 8, N4 Complete Hull in Frame.)] Planking.—The planking is oi Honduras mahogany fitted innarrow widths with close seams. The inner skin, ,\ in. thick, being laid diagonally, the outer skin, T\ in. thick ofthe same material, is laid fore and aft. I am of the opinion this might be improved by fitting the diagonal planking45° inside and 350 outside, and as the stringers run fore and aft, this would make a very strong job. The saving inlabour would be considerable ; roughly it might be stated if in the N. 4 ten men took three weeks to do the outer skinfore and alt, eight men would do the same diagonally in two weeks. In the first case the wages bill would be, say, /150,and in the second £80, which shows a saving of nearly 50 per cent. One has only to consider the time spent in dividingout and in tapering and shaping the planks fore and aft to appreciate the above* Varnished nainsook is laid between these skins ; this not onlymakes a watertight job, but is light and very strong. The inner diagonal skin is held in position with copper pins, the outerbeing through-fastened to the timbers with copper nails, the ends turned on the face of the timbers. Steps.—Outside the main structure already described, adouble bottom or water planing surface is fitted, known as the step. The water planes are framed up forward of themain step with three-ply birch and small stifteners, the frames being spaced 18 ins. apart and secured to the innerhull planing-bottom with spruce fillets. The chine of rock elm is in one piece and tapered from 1 £ ins.by 1J ins. at the front step to i£ ins. by 1 in. at the stem. The stringers are of spruce all in one piece fore and aft,fitted through the three-ply frames, which are fixed to them by small fillets. The timbers are of rock elm of the same size, and spacingas in the main hull, the ends joggled into the chines and tapered to fit the hull. They are secured to the face of thestringers with glue and light copper pins. The bottom is planked with a double skin of mahogany with varnishednainsook between, similar to the main hull. (See Photo. No. 9, P5 showing planking and steps.) Fin Top.—The fin top is framed with rock elm timbersspaced 2 ins. apart, the ends being joggled into the chines and into a fillet of rock elm. The whole is planked in a Photo. No. 10.—The N4 Titania.forward. Interior view looking 246 J
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