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Aviation History
1926
1926 - 0648.PDF
covering of this portion is of fabric, while in front the covering is in the form of three-ply wood. The two portions of the fuselage can be readily detached from one another. The biplane wings are of normal construction as regards .their main spars and ribs, which are of wood, but the drag struts inside the wings are duralumin tubes, with steel wire drag bracing, while the inter-plane struts are also of duralu- min. The wing section used is that known as T.64. SEPTEMBER 9, 1926 as a school machine has proved itself thoroughly reliable and robust, qualities of the very greatest value in school work, where machines often receive treatment of none too gentle a character. There is, however, a very great deal of difference between a machine designed for hard school work and one designed for some very special purpose, such as a competition. Exactly how the de Havilland designers have done the trick we are not certain, but the figures given in the table No. 2. THE DE HAVILLAND " MOTH Three-quarter front view. The undercarriage is of the simple V-type, with the front " legs " telescopic and containing rubber rings working in compression. The Armstrong-Siddeley " Genet " engine is bolted to the fireproof bulkhead which closes the fuselage proper in front, and the petrol tank is mounted in the top centre-section so as to obtain direct gravity feed. The tank itself is of aluminium throtrgrrouir, "wfth~wektedjoints, a form of construction giving •very light weight. The oil tank is placed just ahead of the indicate that the " Moth " as fitted with the " Genet " engine should stand a very good chance in the competition. The empty weight of the machine is 720 lbs. The weight of petrol and oil is 105 lbs. approximately (12 gallons of petrol and 2 gallons of oil). The point-scoring useful load is no less than 725 lbs., so that the machine has a ratio of empty weight to total loaded weight of 0-464. In the earlier part of our Lympne supplement we referred to the efficiency of the 1923 light 'plane single-seaters, pointing No. 2. THE DE HAVILLAND " MOTH " : Side view. fireproof bulkhead. The Blackburn " Bluebird" has anestimated top speed of 85 m.p.h., a cruising speed of 70 m.p.h., and a landing speed of 32 m.p.h. No. 2. The De Havilland " Moth" Armsirovg-Whiiwcrth " Genet " The de Havilland " Moth " is already so well known to our readers as to make a detailed description of the machine quite unnecessary. It has been in use, in its original form as fitted with the A.D.C. Aircraft " Cirrus " engine, by the various light aeroplane clubs for well over a year, and in its capacity 572 out that the figure for " ton-miles per gallon " which they represented was 5-86. The useful load is 725 lbs., and to obtain a mileage of 1,875 lb.-miles per lb. of fuel the consumption for the total distance of 1,964 miles would have to be 72a Ai-96- - 760 lbs. of petrol, or, taking petrol as weighing 7 lbs./gallon, 1 964108-5 gallons. This would represent a mileage of ' ^ = 10o • o18-1 miles per gallon. Such a mileage will not be easy to obtain, but we should hesitate to say that it is impossible.
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