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Aviation History
1925
1925 - 0835.PDF
DECEMBER 24, 1925 THE THREE-ENGINED FOKKER MONOPLANE The Type F VI1-3 m. l.\ our issue oi September 17, 1925. we publislu-il some photo- graphs and a brief general description of the new Fokkor three-engmed monoplane, the type F. \'II-3m. which ha> since done well in America in' the Commercial Airplane Reliability Tour lor the Ford Trophy. Wo have now received trom the Pokker Company certain further particulars relating to this machine, as well as the general arrangement drawings and as three-engined machines are much to the fore at the present moment, we have thought that some data relating to the i'okker might be of interest. struction have proved it to be easy of maintenance, reliable, durable and largely weatherproof. From the general arrangement drawings it will be seen that the three-engined monoplane is of typical Fokker lines with a long fuselage and a monoplane wing of fairly high aspect ratio. The wing section employed is the usual Fokker, which has the characteristic that its lift curve does not show a sharp drop after the critical angle has been passed. In section the wmg tapers both in chord and depth, giving a wing nf tapering plan form. Ailerons of large span but smal\ THE FOKKER F.VII-3m : A three-quarter front view. The engines shown in the photograph are Wright"Whirlwinds" of 200 h.p. each, but other engines such as the Armstrong-Siddeley "Lynx," can be substituted. Concerning the constructional features of the Fokker F. VII-3m little need be said, as these follow, in the main, the well-known Fokker practice, which has already been fully dealt with in FLIGHT on several occasions. The fuselage is of welded steel tube construction, of which the famous Dutch designer has by now had many years' experience, and which he has so far seen no reason to change, whatever theoretical objections may be raised against it. The mono- plane cantilever wing is an all-wood structure, in which the three-ply covering carries part of the stresses. Several vears' experience with commercial machines of this con- chord are fitted, and are said to be very elleetive, although they do not show the horn balance with which the machine on which Fokker gave his non-stalling exhibition at Croydon was provided. The chief departure from the single-cngined I". VII is in the lengthening of the nose of the fuselage to trim the machine with an engine of lower weight than the larger engine with which the older type is fitted. This lias been accomplished by a simple framework of steel tubes, and the space thus left between the pilot's cockpit and the engine plate is so large that after removing the cowling a man may easily, while V. W. The Fokker F. VII-3m: This photograph shows the mounting of the nose and wing en- gines, the pilot's cockpit and the I undercarriage. * w. w. m m m m m m 835
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