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Aviation History
1924
1924 - 0773.PDF
DECEMBER 11, 19-4 its excellent performance bears out the impression of efficiency. The particular Napier engine used, by the way, has a com pression ratio of 5-8 to 1, and the performance figures given below apply to the machine thus equipped. The main dimensions of the Fokker D.XIII are : Length, o.a., 7.9 m. (25 ft. 11 ins.) ; height, 2.9 ms. (9 ft. 6 in.) ; span 11 m. (36.ft.) ; wing area, 21.47 sq. m. (231 sq. ft.) ; the weight empty is 1,180 kgs. (2,590 lbs.). The totafuseful load, com posed of pilot, fuel for 2\ hours, guns, anmmuition, etc., is 430 kgs. (950 lbs.), and the total loaded weight is 1,610 kgs. THE KOOLHOVEN MONOPLANE IT may be remembered that at the last Paris Aero Show the Nationale Vliegtuigindustrie of The Hague, Holland, other wise the Dutch company of which Mr. Frederick Koolhoven is technical director and Lieut.-Col. H. Walaardt Sacre managing director, exhibited a monoplane with Bristol " Jupiter " engine. Since then the machine has undergone considerable development, and as now exhibited, the F.K.31 is certainly an exceptionally fine two-seater fighter. It is, as the accompanying photograph will show, a parasol mono- ANOTHER DUTCH EXHIBITOR AT THE PARIS SHOW : The F.K.31 two-seater fighter monoplane exhibited by the Nationale Vliegtuigindustrie, of which Mr. Frederick Koolhoven is technical director. Note the wide chassis, which is reminiscent of the B.A.T. machines. (3,540 lbs.), giving a wing loading of 75 kgs./sq. m. (15.4 lbs./sq. ft.) and a power loading of 7.9 lbs./h.p. The top speed at ground level is 280 km./h. (175 m.p.h.). The machine climbs to 5,000 m. (16,400 ft.) in 12 minutes, and has a service ceiling of 8,000 m. (26,300 ft), Its absolute ceiling is 9,500 m. (31,200 ft.). These figures are, we understand, those obtained on actual test flights, and not estimated figures, and if correct they are testimony not only to the power deve loped by the Napier " Lion " but also to the skill of the famous Dutch designer. plane, with strut bracing and an oleo undercarriage giving exceptionally long travel—10 ins., to be exact. The engine fitted this year is a French-built Bristol " Jupiter." The F.K.31 has a steel tube fuselage structure, but whereas Fokker uses welding for joining struts to longerons Kool hoven has developed a special form of joint employing tubular rivets, no welding being used for stressed parts. The formers or bulkheads of the fuselage are made of Duralumin, a special paint being used to insulate the two so as to avoid any electric action. The rear portion of the fuselage is fabric covered, ON THE KOOLHOVEN F.K.31 : 1. View, looking upwards, of the pilot's cockpit, circular opening in wing, and aileron crank. 2. Side doors give access to the cockpits of the F.K31, a very neat locking device, shown in 3, securing the doors during flight. The oleo undercarriage has a travel of 10 ins. 773
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