Abstract: Movable appendages or stores containers that are positioned controlled in regard to an airplane so as to approximate the cross-sectional area distribution of a minimum drag body of revolution through varied flight regimes of the airplane from take-off to landing and thereby obtain favorable interaction of pressure fields throughout such flight regimes and adjust the store increment on the locus of least drag points in deference to the teaching of the prior art to design the location and shape of such appendages in a compromise position for but one portion of an airplane's flight regime; i.e., normal cruise altitude and speed.