Approximations for column effect in airplane wing spars (1927)
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490 REPORT NATIONAL ADVISORY COMMITTEE FOR AERONAUTICS for the single-bay spar with hinged inner end being plotted against percentage length of overhang in Figure 4. Unfortunately, the points of inflection do not remain fixed, but move outward toward the ends of the bay as the column effect becomes… … 0 ./ .2 .3 .4 .5 .6 .7 .8 .3 P/Pe FlO. 3 a practice to allow for this shift empirically by basing the Euler load in the Perry formula neither on I nor V, but on a fictitious length l' + n(l — I'). The coefficient n is, of course, fractional and varies with the type of truss under consideration. For…
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