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Aviation History
1931
1931 - 1245.PDF
November 27, 1931 Supplement to FLIGHT ENGINEERING SECTION Edited by C. M. POULSEN November 27, 1931 CONTENTS Page 81Wing Oscillation. By A. E. Parker, B.Sc In the Drawing Office— Strut Fairing. By H. Parkinson 84 Inspection of Wiring Plate Angles. By D. Maclean Brown A.M.l.Mech.E ' 85 Technical Literature— Jahrbuch 1931 Der Deutschen Versuchsanstalt fur Luftfahrt, E.V. Berlin Adlershof 85 Summaries of Aeronautical Research Committee Reports Hence the load on front spar at velocity v will be «! 0 + &j — ifl cdx for a strip dx wide, where c is the W WING OSCILLATION By A. E. PARKER, B.SC. (CASE I) chord. Put — = a- = air density. 9 Considering fig. (2), at a distance x from the fuselage, the forces acting arc : tho elastic force of the fuselage, the wind force, and the gravitational force. 8*! where w is the weight of the wing per foot ran (unit) g is the IN this case only the spars will be considered, and the effect acceleration due to gravity, f h y pof the bracing will be entirely omitted, except as regards the weight of the wing. As a wing warps, the centre of pressure of the wing moves backward or forward, depending on the direction of warp. In Fig. (1) the end view of a section of a wing is shown. If L is the load per foot run at this section Then :—Load on front spar = L ( U -^ g ~+ -~ = K 0 + bxw x bl Load on rear spar = L d cp — a d i.e., u "k1 •eT 9 S~^ $J2 a a v2 c x/ a g v2 c w + ,<r g ific w The significance of the symbols is obvious from the figure. A similar equation will be obtained for the rear spar. 6 is the angle of incidence of the wing after warping. Hence the equations of motion are :— Sin P = mately. d and if 6 is small 6 = approxi- (1) ... Pj ^| + ^ = Ql ((Jll _ Rx ... for front spar If a graph of load on the spars as ordinates, and G as an reaT IKL: D2
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