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Aviation History
1914
1914 - 0177.PDF
FEBRUARY 14, 1914. Finally I would ask you devote some more of your time to scientific research work with your models: improving their gliding angles, their lifting capacity and their stability. You can always improve your model by cutting down its weight, but if this is done at the expense of its strength it is no real improvement. Improvement should move along the lines of better aerodynamical qualities ; there fore, it is in this direction that I hope you will experiment and carry out research work. Mr. W. E. Evans' Single Propeller Record-Holding Model. We have much pleasure in publishing the following particulars l/SH admirably. The front hooks, or rather loops, and protector is made of 17 gauge piano wire in one piece bent to the necessary shape and soldered, and then bound on with thread. The chassis, also of 17 gauge piano wire, is triangular in shape being 11 ins. from axle to top and having a base of 8 ins. This extends 3 J ins. above the top of fuselage, and forms a kingpost for the necessary straining wire on top. Genuine piano wire only should be used for this, otherwise the longitudinal stability of the model becomes unreliable owing to the strain of the rubber underneath. The wheels are of 3-ply wood ij ins. in diameter and -j\ in. thick, SINGLE PROPELLER MONOPLANE- CANARD TYPE SILVER SPRUCE HOLLOW SPARS BIRCH ¥,i, » 4" LENGTH 3-6 WE EVANS •l7&AU<i£ PIANO tolKE- TRACK S %. " and illustrations (supplied us by Mr. Evans) of this model, which holds the official British records both for distance and duration, the former being 290 yards and the latter 64 sees. : — The fuselage is built up of two silver spruce hollow spars blocked at the centre and ends, of rectangular section J in. high by £ in. wide, and 3 ft. 6 ins. long, planed very thin so as to weigh only J oz. each. The centre is bowed to the extent of 3 ins., and held in position by two pieces of ^ in. by ^V ™. birch glued and pinned above and fret cut and fitted with hubs made of brass tubing with a collet soldered on either side to make the tubing quite firm. Their weight is one dram each. A double skid of 17 gauge piano wire is fixed at rear of fuselage to allow ample clearance for the propeller. >**Q The main plane is 27! ins. span and 54 ins. chord, made of T\ in. by -V in. birch and covered with fabric. The weight of this is 10 drams. The dihedral is a curve instead of the usual V. The ** | fuSHT. ^fefefc, ^^'^ ;Sffl^^ ^^fcjg|||^# J \ •J ^^^^^^^^^*s^^^0^^^** BMBSP^T ^H . • A single screw r.o.g. monoplane by W. E. Evans. below. Similar pieces for stiffening are also fixed across midway between the centre and the ends. The hollow spars are chamfered one side at either end to form a joint which is glued and bound with thread. The gear, comprising two J-in. cog-wheels, was specially made by Messrs. J. Bonn and Co., the weight of which (complete with spindle for propeller), is only 6 drams. It answers its purpose camber is \ in. in the centre and J in. at the tips, these having Ja very slight negative angle of incidence. Two of the ribs are fixed 1 \ ins. on either side of the centre to rest on the fuselage, and allow a firm fixing. When birch plane edging is glued and rivetted, holes should always be bored for the fine pins just a tight fit, to avoid splitting the wood. The elevator is 9 ins. span and 2f ins. chord, and weighs 3 drams. 177
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