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Aviation History
1910
1910 - 0539.PDF
JULY 9, 1910. MODELS. RECIPE FOR PASTE. [607] As ordinary paste is unreliable, and often very disappoint ing, the following is a good and most useful cement, suitable for any parts of an aeroplane where an adhesive of the kind may be necessary. Take enough good flour to make a I lb. jam jar fairly full of paste, to this add a good teaspoonful of finely-powdered resin, mix well with the dry flour, then add a little clean cold water to form a stiff paste, smooth with the back of a spoon, and then nearly fill up jar with boiling water, well stirring all the time. Set the jar in a saucepan of water on a slow fire, keep it hot while stirring until the resin is melted and the paste thickens. Remove from fire, and stand aside to cool, stirring occasionally till cold, then use as required. Made as above, this paste is a strong adhesive, and very durable, and the resin, while imparting a flexible quality, also resists damp and actual moisture to a greater degree than when made in the ordinary way. Newport Pagnell. HENRY BATH. MINIATURE MODEL. [608] Being a regular subscriber to your paper, FLIGHT, since iis publication, and knowing what kind and sympathetic interest you extend to amateurs and students in the art of flying, I venture to submit to you for criticism a model in miniature of the Wright biplane. The chief novelty in the construction of same is the absolute exaclitude in detail, i.e., hand-carved propellers, wires, stays, control, engine, radiator, &c. If you would look at it, and give me ycur candid opinion as to whether I could find a sale for this type of work I should consider it a great favour. Bromley. JOSHUA UPTON BENNETT. [The accompanying photograph is an illustration of the model referred to in our correspondent's letter. It is certainly a beauti fully-executed example of miniature model making, and should be attractive to anyone who is desirous of firming a collection ol modern flying machines on a small scale. A penny is shown along side the model as a guide to its size.—ED.] MODEL MOTORS. [609] Could you please forward to me a few names of firms who supply spring or any small motors for experimenting purposes with models, and is it possible to get one that would drive a pair of tractor screws with gear and chain ; the size of screws to be about 9 ins. ? Shepherd's Bush, W. H. J. HERBER. [Several makers of suitable motors are now advertising in FLIGHT.—ED.] ELASTIC MOTORS. [610] Your correspondent, although he primarily asks for a table that could be generally used to determine the necessary amount of elastic per foot of sustaining surface, later explains that he requires to know what would remedy the apparent defect in his machine. We employed about fifteen lengths of |th strip best Para rubber. From the sketches of his framing, and the exceedingly small weight, we gather that his is a Bleriot "type," and not a genuine model. Our framing was constructed as illustrated in the accom- //DGHTI panying sketch. The yellow pine used was seasoned for 20 years previously, and despite its lightness, it is exceedingly strong. It would not help him to know where our e.g. lies, owing to the difference in weight. We would suggest that he should place a sliding weight of about f oz. in the front of main framing, as per accompanying sketch. He could then alter the e.g. to suit c.p. by manipulating the weight. If his machine will not glide, it will fly ; but if it will glide, let its behaviour be carefully noted, and it can then be made to fly. Our ball-bearing thrust weighs nearly an ounce, having the distinct advantage of a balance, serving a good purpose. It appears that he is trying to "run" before he can "walk." For no less than four months we daily practised gliding with an original glider of 4 ft. span. It was subjected to sharp draughts at intervals, and its behaviour noted. Such (experience as thisj is necessary to make a successful flying model. Lowestoft. R. and L. RICHARDS. ELECTRIC MOTOR. [611] I have built a " Farman " biplane one-eighth actual size, lifting surface over 7 sq. ft., the machine weighs 2 lbs. I want to know where (if at all) I can obtain a suitable 4 or 8-volt motor, which would drive the propeller (12 in. by i| in. blades) at about 1,000 revs, per min. Such a motor would weigh probably 2 lbs. or so, and with dry cells, the entire weight of machine should be well under 54 lbs. Would the machine be capable of carrying this weight provided a sufficiently high number of revs, were kept up ? Perhaps some of your readers could oblige me with the informa tion I require. Thanking you in anticipation, Bingley. JOHN HIRST. MODEL FARMAN BIPLANE. [612] Having constructed a model Farman machine as per your drawings in your issue of FLIGHT, October 16th, 1909, I shall esteem it a favour if you could tell me how to fix an elastic motor to same with a suitable propeller. The planes are 23! ins. long, 4J ins. wide, its total length being 29J ins., with a weight of $\ ozs. The framework is made of split cane, the joints being lashed with strong wax thread. C. WHEELER. [The accompanying sketch is merely a suggestion of a method that might prove suitable for the machine in question. Unfor tunately, we have had to imagine the details of the machine, as well as those of the propeller mechanism, for our correspondent did not submit his designs.—ED.] 537
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