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Aviation History
1910
1910 - 0071.PDF
JANUARY 22, 10,10. itself is quite of sufficient difficulty without attempting to relate any one particular incidental feature in its construction to another detail of the construction of the machine. The only important relation between the propeller and the rest of the machine is its thrust value and its effective pitch. If a machine is designed to fly at any minimum speed the only consideration that need trouble Mr. Ross is that his propeller should give the required thrust to maintain that speed, and when doing so it must travel through the air at the speed of flight, i.e., true pitch and slip must be known and accounted for. London, W.C. ROBERT W. A. BREWER. ANOTHER SCALE MODEL FROM "FLIGHT." [309] Is this of any interest to you or your readers ? Photo of model Antoinette I made from the scale drawings in Nos. 43 and 44 of FLIGHT. It is not an actual flyer at present. I have it for rshow purposes in the shop window, working (the propeller) by electric motor. The scale is f °rds inch to the foot. Church Street, Preston. A. C. BECKETT. THE "DEMOISELLE." i[3IO] I should be greatly obliged if you could assist me on the following point. I propose making a model aeroplane, preferably " La Demoiselle," but have so far been unable to obtain drawings of the same. I see •they have been in FLIGHT some time ago, so if you could let me know the required numbers I should be obliged. I find that your valuable journal is the most instructive and interesting of its kind. Rotherham. J. CONVILLE. [The description of the " Demoiselle " appeared in Nos. 40 and 41.—ED.] SURFACING. [311] I write to suggest a method of fixing canvas or wings, &c., *which may be of use to Mr. L. L. Richards. Fasten down one edge first, either with tacks or sewing, then bring *he material under the framework round over the top to the edge which has been fastened down. The cloth must be longer than is required to cover the frame. The free end is now to be fixed between two spars of wood, C, the two pieces of wood with the «nd of the cloth between being fixed together with screws. I/O GMT wood hang two equal weights, equidistant, and then proceed to fasten down cloth where necessary. If the plane be a curve proceed as follows : Fix at A first, then carry cloth under the convex side, round B, over the concave side to A, hang weights as before (or fix with springs), then, having fixed down at B, take a sufficiently strong spar of wood and press the cloth down on concave surface and nail. Most cloth will stretch when wet, therefore it is advisable to damp the cloth before fixing it down. Trusting this method may be of use, London. ROBERT-BAILLIE GALT. CONSTRUCTION OF MODEL PLANES. [312] I much appreciate the compliment you paid me in inserting my drawing, re the " Construction of model planes," in the pages of FLIGHT this week. One important detail is, however, omitted, which stood as a foot note to the drawing, viz., the screw-holes drilled in the lower whalebone strips of the ribs should be a little closer together than those in the upper strips, according to the camber required. If this is done, a rigid and permanent camber is produced, by the tension of the lower strip. I think, perhaps, this might not be apparent from the drawing unexplained, so if you see fit will you insert this also ? Downham Market. HAROLD KELK. DUTHEIL-CHALMERS ENGINE. [313] . I should be much obliged if you or any of your readers could give me information as to the Dutheil-Chalmers engine. Also whether it has been fitted to any and what successful aero planes. Folkestone. M [At the time of the last Olympia Show Mr. Windham exhibited a flyer fitted with a Dutheil-Chalmers engine.—ED.] WARPING. [314] Would you hindly inform me, through your valuable paper, the best method of warping a pair of Hi ft. span wings of a mono plane, the aspect ratio being 4$—I ? How much of thewing should be warped—i.e., how near the extremity should the warping-rope be attached ? How much of the trailing edge is sufficient ? Is it necessary for the wing that is not being warped down to rise a corresponding amount to the one that is ? Newmarket. R- R- [What is probably the most satisfactory method of warping the wings of a monoplane is that followed in the " Antoinette " con struction. The rear transverse spars of the main wings are in this machine pivoted to the chassis frame so that they can rock. One spar is raised as the other falls. The forward transverse spars are fixed rigidly, and consequently the result of tilting the rear-spars is to cause a gradual warping of the planes, which increases in amount from the shoulder to the tips. The actual operation of warping is accomplished by means of suitable wires connected to the spars, and the operating mechanism is under the pilot's control. In machines where the spar is not arranged to tilt, warping is accomplished by flexing the spar under the actual tension of the operating wires. In this case it is advisable that the operating wires be attached at least three-quarters of the way from the shoulder in order to secure an effective leverage. Details of warping mechanisms can be seen in the various photographs and sketches that we have already published of the principal machines.—ED.] FARMAN SCALE MODEL. [315] I intend to build a model of Farman's biplane, scale I in. to 1 ft., from drawings issued in part 42 of FLIGHT. Would you be so kind as to tell me if birch f\ in. square would be suitable for the framework of same or would you advise a smaller size ? Would you say also what sized propeller or propellers would be required to drive the same. Battle Bridge. C. G. JAGO. [Perhaps some of our readers who have made models about this size could give our correspondent advice on this matter.—ED.] To the SPRING MOTOR. [316] Could I find out, through your valuable paper, if I can get asuitable spring motor for a propeller 18 in. diameter, l8 in. pitch, and 3 in. face on blades, the motor to be capable of running 500 revolu tions in 30 seconds, and the weight not to exceed 16 or 18 01. ? And oblige yours faithfully, Hayle. SPRING MOTOR. 6f
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