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Aviation History
1913
1913 - 0165.PDF
FEBRUARY 8, 1913. Edited by V. E. A 12-oz. Tractor Monoplane, WE publish this week particulars and scale drawings (kindly sup plied us by Mr. A. B. Clark, Hon. Sec. of the South Eastern Model Club), of a rubber-driven tractor model of a somewhat heavier weight than those in general vogue. The model was partially con structed by Mr. J. H. Dollittle (who is well-known for his work in connection with this type of model), and completed by Mr. C. A. Rippon, the present owner and flyer of the model ; both being members of the above-mentioned club. As Mr. Clark says : " twelve ounces is considerably in excess of the average- rubber-driven model, and judging by the monthly reports in FLIGHT there appears to be only a few models (excluding, of course, power-driven ones), which exceed 10 or 12 ozs. in weight and which are actually capable of flying a fair distance and for a sufficient lime to allow of careful observations being made." If model flying is not indulged for purposes of observation and careful deductions therefrom, why trouble about it at all ; we have more than once referred to the subject of the flying of larger models. In a postcript to his communication, Mr. Clark says: " I think we shall have quite a number of rubber-driven models in use in the S.E.M.Ae.C, weighing between 2 lbs. and 3 lbs., but details will not be available for some months." We certainly trust that such will be the case, and when details are available we shall be very pleased to publish them, for it is experiments with larger and JOHNSON, M.A. heavier models than those now in average use that are so' much needed. To return to our model: The Fuselage is 46 in. in length—the maximum depth and breadth is 4*5 in. and is situated al«mt i± in. from the propeller bearing. The three main longitudinal!, »re con structed of straight-grained silver spruce, and the distance pieces (or struts) are made of yellow bambuo (which is more reliable than the mottled. The joints are lmund with strong thread and glued— being afterwards again bound with silk ribbon 0*5 in. wide. The Main-plane spars are built of ash j> in. by A *n- section, and the ribs of birch A in. by Vtt •*». section. The ribs are joined to the spars by small pins or fretwood nails. The plane has a camber of about o#5 in. near the centre with a gradual reduction towards the tips—the outside rib having a camber of only o"25 in. The trailing edges of this plane are flexible. The chord at tlii fuselage (centre) is 6 ins., tapering to 5 ins. at the tips. The Tail is constructed of s6a in. x aaf in. cotton wood (should cotton wood not be procurable, straight-grained poplar can be used). It has a maximum chord and span of 15 ins. anil 10 ins. respectively. This plane is laid quite flat on the top frame-members, and is wired in place. The Rear-fin is made of 18 S.W.G. piano wire. The covering fabric used for all these surfaces is Hart's proofed silk. The main plane (and we presume the others as well) is only single surfaced. A 12'oz. Tractor Monoplane. 165
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