REPORT NATIONAL ADVISORY COMMITTEE FOR AERONAUTICS. 6 plane Spars/' we have for a given arrangement of the spars, the loads upon the spars with changing angle of attack without calculating the partial forces and the forces T acting in the direction of the chord regardless of the thmst of the… … Acc. fo BLV 19/3 Angfe ofaH-och:= oc Fig. 10.—The four load cases on wings. Fig. 9.—Spar loads Fand // in relation to the angle of attack a. The air pressure resulting from a uniform gliding flight is determined by: G r- CgF From this equation the forces upon the spars are derived: 6 ?7=[c„-|c,]£ Cg
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