24 REPORT NATIONAL ADVISORY COMMITTEE FOR AERONAUTICS FORWARD SPAR Wt = C(0.0092x' - 0.5204X + 6.601) 7, = C(0.2602xf-0.0031x5-6.601x + 32.14) M, = C(0.00077x' - 0.0868x5 + 3.301x'- 32.14x + 91.94) REAR SPAR WM = <7(0.3483x - 0.0092x'- 0.1534) Zj = 6/(0.003 lxs - 0.174 W + 0.1534x + 5.231) Mg =… … Angle of of lack, cL Fig. 7.—Profile characteristics. Air speed 40 miles per hour. Original data corrected for model asymmetry The maximum bending moments occur at x=0, and by (2a) the spar stiffness ratio here required for equal flexure and no flutter is Mi_ I, 91.94 = 4.05 Mt It 22.69 This ratio…
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