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Aviation History
1921
1921 - 0105.PDF
FEBRUARY IO, 1921. -, NOTE.—All communications should be addressed to the Model Editor. A stamp should be enclosed for a postal reply. The Valkyrie TypeMY other drawings show details of a model Valkyrie mono- plane, a type now obsolete as far as full-size machines go.but an extremely pleasing one to model. The elevator fastening and adjustment are shown in detail. The trailingedge is held down in a notch in the wooden uprights by centre of gravity of the machine if it is preferred to make themain-plane a permanent fixture. I personally prefer to test the model without the weight, find the correct position of themain-plane, and then fix the weight on the e.g., effecting any subsequent adjustment to the elevation by means of the weight.The main-plane fixture is shown by Fig. 2, and consists of wire " 1 2 3 A 6 (f r 1 9 ,0 ii 1,3 19 « >5 in€he$ T , So/tfereg fo - 4 finnt-h/ane <2°*3" X1 r~~ ~ /at- **• c notches /or X\ piooq , fears (Ptjua/JpIQOO u/mp rubber fine iron wire or thread, passing through a small hole, whilstin front a brass quadrant with slots in the front edge is lashed to the top members of the framework of the machine, thewire of the elevator being held in the required notch by its springiness. The fabric covering is not shown in any ofthese sketches. If it is intended to use four wheels, as in the prototype, two each side carried on ^hort axles, I showan arrangement by which this may be accomplished by means of rubber suspension and radius rods. These latter areformed of one piece of wire passing through a tinplate bent around and bradded to the skid. The ends of the wire arebent around the steel wire and soldered there. After slipping the wheels over the ends of the axle, some short pieces ofbrass tubing are pushed on and soldered in place to form collars to prevent the wheels coining off. Excellent suspension wings may be made by cutting shortlengths off a piece of india-rubber tubing of sufficiently large diameter. The Weight Lifting Monoplane Two details of construction only need be dealt with—the attachment of the lead deadweight and the main-plane attachment. The former (Fig. 1) consists of a lead casting ofstreamline form equal in weight to one quarter of the total weight of the model. It is suspended to the model by meansof piano wire, the end of which is doubled back to form a spring so that it fits snugly into a hole drilled in each end ofthe lead weight. This weight can be made to adjust the crutches bent and soldered to saddle the spar; lugs boundand soldered to extensions of the leading and trailing edges of the two halves of the wings fit over the wire extensions,and are held thereon by means of the bracing wires. Replies to CorrespondentsD. A. (Vancouver).—The money order was duly received by me, forwarded to and acknowledged by Mr. Grove9.I have also forwarded your letter to him. W. B. (Vancouver) .—The appended sketch shows the typeof fitting you require for the glider. /ape varnisbea1 cross member E. G.M. (Sutton).—You will note that a recent paragraphdealt with one portion of your query ; the remainder I replied to direct. • , f/xed fo frame • fftrunq info ro/c/ered 105
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