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Aviation History
1921
1921 - 0247.PDF
APRIL 7, 1921 similar manner to the inner hull, carefully fitted to the chine and hull-fillet rabbets and closely fastened with screws. Protection Plates.—Rubbing plates of ^-in. brass, bent to the shape of the bottom, are fitted along the keel, and the chines are also protected by brass strips fitted along the 5CLCTIOM A A. SECTION BB. DTML. OF Ffaa-nQN OF Ccmen 1 Sketch 1. sides and bottom with the fore ends let in flush and securedby screws. A strong point in favour of the small transverse framedhull is its resiliency, as it does not depend for its efficiency upon the rigidity of the parts comprising it. (See Photo.No. 10, N4 Interior View Looking Forward.) Up to the present all flying boats have been built principally of wood,bat Messrs. Beard more have recently taken the next step towards advancement in building a composite boat. This is a MI. or PQRTIo n OF Sketch 2. stage in construction shipbuilders arrived at many yearsago, and at that time many problems had to be solved to get a satisfactory job. However, Naval Architects mastered all theproblems, with the result many good composite boats are still in commission. The composite boat known as" W.B.IX.," built by Beardmore, is on the longitudinal system, the main portion of the hull being of approximatelycircular form. There are 17 continuous longitudinals, which run right fore and aft, care being taken that none of thesemembers are cut throughout their entire length. The seven longitudinals on the lower side of the hull are builtas shown in sketch 1, and the remaining longitudinals on the top side are built as shown in sketch 2. The channels formingthese longitudinals are of duralumin 25 mm. x 15 mm- X 15 mm. x .04 in. thick, and are braced as shown insketches 1 and 2. The main transverse frames are intercostal between thefore and aft longitudinals and are spaced along the boat at approximately 2 ft. apart. (For construction see sketch 3.)The channels forming the transverse frames are the same size,as those in the longitudinals. The transverse frames areconnected to the longitudinals by duralumin double angles 14 mm. x 14 mm. X .028 in. and gusset plates of .04 in.thick. The framing from keel to chines and from chines to hull side is formed of duralumin channels 25 mm. X 15 mm.X 15 mm. X .04 in., this framing being braced and supported to the main portion of the hull by duralumin channels andgusset plates. Intermediate transverse framing is fitted from chine tokeel and keel to chine on the bottom of the boat, the spacing of these transverse frames being approximately '8 ins. Inter-mediate longitudinal frames are als6 fitted approximately 6 ins. apart, the latter framework forming a support for theskin of boat. These intermediate transverse and longitudinal frames are formed of light duralumin channels .033 in.thick and .04 in. thick as required. The intermediate transverse and longitudinal framing on the top of the boatis of similar construction to that on the bottom, the framing at this part forming 8-in. squares of the same section ofchannel. The continuous main longitudinals run right forward andfinish into a heavy transverse nose frame built of duralumin channel and plate, thereby forming a very rigid structureforward. In front of this frame the nose of the boat is made of a removable steel nose cap which can be removed andreplaced in the event of damage. The keel and chines are of 04' DtTML. R>gTON OF Fg^ME. Sketch 3. American rock elm and are double rabbetted to take thetwo-ply skin. (See sketches 4 and 5.) This double rabbet is a great improvement over the method adopted in theF. boats, but the chine piece would have been better if a greater distance had been left between the edge and endof planking. The skin below the chines is formed of two thicknesses ofmahogany planking, the inner thickness being | in. laid at an angle of 45°, and the outer thickness -fe in. laid foreand aft. One ply of varnished cotton fabric is laid between the mahogany skins. The skin is fastened to the duralumin 10/6x25% «IO% y-04 CHANNEL 4 B. A BOLT5 AT TRANSVERSE AMES WOODSCREWS N*?4 X 2* PITCH STAGGERED DETAIL SECTION Sketch 4. • framing by J^ in. duralumin nails clenched over rooves in the inside of the hull. The two skins clear of the framing are riveted together with similar nails clenched over rooves. The skin above the chines is of two thicknesses, each -g\ in. mahogany, the inner thickness laid at 450 and the outer thickness fore and aft, with varnished fabric between. Attachment to framing is similar to that of the bottom skin. The builders have avoided many of the mistakes the early -347
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