Minimum swept-wing induced drag with constraints on lift and pitching moment.
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...(9) Equations for computing values of C for some common beam cross-sections are presented in Ref....
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...Equation (5) could be applied in the early stages of preliminary design, if no conflicting constraint is placed on the weight distribution....
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...Phillips, Hunsaker, and Joo [9] have shown that Prandtl’s 1933 lift distribution also yields a minimum in induced drag for the stress-limited design of a rectangular wing with fixed weight and chord-length constraints combined with the weight distribution constraint given by )( ~)( ~ )()( ~ zW L zL WWzW srn (5) Equation (5) alone does not completely specify the weight distribution )( ~ zWn ....
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...Equation (27) gives the minimum possible induced drag for the stress-limited design of a rectangular wing with fixed wing loading, the weight distribution specified by Eq....
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...(6), (8), and (16) with the relation sn WWW yields W b nn nn ctEC SWB WW gm gm n 6 max 2 max 2 3 )1( )(32 )()1( (28) Equation (28) is easily solved for the gross weight, and using the relation ns WWW yields 6 max 2 max 2 3 2 )1( )(32 )()1( 42 b nn nn ctEC SWBWWW gm gmnn s (29) Using this wing-structure weight with the relation sn WWW in Eq....
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