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Aviation History
1915
1915 - 0482.PDF
Edited by V. E. A Scale Model of the Blackburn Monoplane. BY F. MABB. " HAVING grown tired of the oidinary flying model, I decided to branch out into something more interesting. This took the form of a scale model. Being able to examine the Blackburn monoplane pretty closely, which, before the war, was flying frequently up north here, I decided to make a model of this machine. As I have made two models of this type, and met with some success with both, I herewith give a few details and experiences of them. The first machine : Span 3 ft., chord 7 ins., overall length 2 ft. 6 ins., plane Mr. F. Mabb's model. surfaces made of piano wire, single surface, fuselage built up, using A by J birch for the longitudinals and three and five ply for the inter-sections, fuselage covered one • third of the way with -^ aluminium, fitted with a cowl under which runs the three geared motor connected up to three skeins of i-in. strip rubber, each skein consisting of four strands ; these were coupled up to a 10 in. tractor screw of 15-in. pitch, giving 1,200 revs, per min., running for JOHNSON, M.A. was rather more, being four skeins of |-in. strip, five strands per skein, driving on to a five-geared motor. By the way, in both models the gears were all one pitch, neither was geared up nor geared down, driving direct on to a 12-in. screw, giving 2,000 revs, per min.; complete model weighing if lbs. The results here were not so good, only getting 20 yds. r.o.g. out of her; but I think the tractor screw revolved much too fast, for when the model has flown a few yards I always notice it overbanks to the left. I have tried altering the rudder to counteract the torque, and find this makes very little difference, so I intend fitting a 12 in. four-blade screw, which will run out about 1,200 revs. ; thig, I think, will stop the tendency to overbank. At present the model is under repair, having a smashed chassis, broken wing-tip and damaged fuselage. This occurred on Sunday, June 13th, another unlucky number, but I had the satis faction of seeing the model rise from the ground and fly a matter of ten yards, which is a little encouragement. " I find the most difficult task is to get the centre of gravity well forward. This wai managed by carefully weighing the parts and making the tail as light as possible, for, as you will see by the accompanying photo., the planes are well forward, thusjgiving a much better appearance. " As I am contemplating constructing a power-driven model of the same type, fitted with floats, I should like to know where I can purchase a reliable engine, either a flash steam plant or a petrol engine of about \ h.p. j the span will be 7 ft., chord 16 ins., overall length 5 ft. 3 ins. ;"""' '"' " As I am the secretary for the International Club of Aeronautics for Leeds, I should like to hear from anyone interested in models in this town with a view of forming a flying club. Write to or call at No. 4, Bk. Greenmount Terrace, Beeston Hill, Leeds." A Wireless-Controlled Model Aeroplane. By J. C. BALDEN. " Regarding your article in a recent issue of FLIGHT on' a ' Wireless-Controlled Dirigible,' an identical article of which appeared in the Aero on September 21st, 1910, part of which mechanism is employed in my solution of a Wireless-Controlled Model Aeroplane. HS^JL VP XL E.S. ELEVATOR CAM. ART RULWR CAM. E5. ENGINE CONTROL CAM. THIS POINT FOLLOWS OUTLINE OF CAM ^ PIVOT— 1 To TAIL. SPRING 1 To TAIL RATCHET ? WHEEL7 COHERER ENO VlfcW v BATTERY 25 sees. ; when finished the complete model turned the scale at £ lb. ; best flight 50 yards off the ground. " With regard to the second one, the span here was slightly more than the first model, being 3 ft. 6 ins., chord 8 ins., overall length a ft. 11 ins., planes built up; double surface ; the power in this case 482 A wiueless-controlled model aeroplane by Jas. C. Balden. " The problem I set out to solve was, to make an aeroplane answer to three things, namely, the elevator, rudder, and engine control; wing warping could be included, but at the present stage would only complicate matters. The model is controlled by the use of cams, which actuate the elevator, rudder, and engine control,
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