FlightGlobal.com
Home
Premium
Archive
Video
Images
Forum
Atlas
Blogs
Jobs
Shop
RSS
Email Newsletters
You are in:
Home
Aviation History
1920
1920 - 0569.PDF
MAY 27, 1920 ••' • . \ ( •. :! •' v' "• ^'••-•'"••• -•;:•: -,-::- :••-. - - ' •:- •.-,•. ". \ / V ; i. NOTES ON FLYING BOAT HULLS By Major LINTON HOPE, M.I.N.A., F.R.Ae.S., Consulting Naval Architect to H.M. the King of the Belgians and to the Air Ministry. ,. .> (Continued'from page 548.) IT has been suggested that P.5 and later boats of much larger weighed 436 lbs., 437 lbs. and 440 lbs., the estimated weightsize,, designed^by the writer, have been evolved to some extent being 430 lbs. The variation of the fore and aft position from L-ii-i. but a glance at the profiles of the 41-ft. design of the hull C.G. was J in. aft and A in. forward, while theof 1916 (Fig. 7) and the 45.ft. P.5 of 1918 (Fig. 8) will show C.G.s of the 45-ft. P.5 and the 64-ft. boat were both exactly at once that the latter boat is obviously developed from the as designed. T1ML P1.HW Oft HULL FIG. 8. Figs. 7 and 8.—Major Lin ton Hope's 1916 design and P. 5 of 1918 NOTES ON FLYING BOAT HULLS : The 50-ft. N.P.L. No. 135 of 1915 and the C.E. 1 of 1917 writer's orginal 1916 type, which was totally different fromany flying boat in existence at that time. C.E.I, built in 1917, in her general form, is not in the leastlike either the 1916 41-footer or the 1918 P.5, except that the main planing bottom, forward of the step of C.E.i (seeFig. 9), has a marked resemblance to that of the writer's 1916 design, the lines of which were lent to the Royal Air-craft Factory, Farnborough, where the design was made after many tests at the N.P.L. tank. She was built under the supervision of the writer and tohis specification of TV in- single skin mahogany, for the main hull, the construction being generally similar to thatof the A.D. boats already mentioned, but owing to the difficulty of construction of the tail the labour per squarefoot of hull surface was increased 15 per cent. The last design is for a flying boat of 72,000 lbs. weightand over 80 ft. in length, and the construction section (Fig. 10) is that of an intermediate size design for 32,000 lbs.The first boat built from this design came out only 12 lbs. in excess of the estimated weight for the bare, hull, while asecond boat built by another firm, was only 130 lbs. more. Fisjs. 11 and 12 are photographs of this boat while underconstruction, made by Capt. Jones, R.A.F. _ As the estimated weight was nearly 3,000 lbs., these errorsarc-almost negligible, and the difference between the boats is probably entirely due to difference in the specific gravity of the timber. . , ..,_•.,.• Additional examples of the accuracy with which it is possible to estimate weights with this system of construction are two 24-ft. boats (Fig. 14). estimated weight 216 lbs., actual weights 210 lbs. and 209J lbs. Three 30-ft. A.D. boats, built by three different firms. BOHStCTlOMS or K.1K1MC AOTTovivBOTH/-,«.»* rp %tmt *i AM Fig. 9. Bow sections of planing bottoms of N.P.L. C.E. 1 and L.H. 41-footer 569 E 2
Sign up to
Flight Digital Magazine
Flight Print Magazine
Airline Business Magazine
E-newsletters
RSS
Events
