A study of airplane ranges and useful loads (1920)
NASA Technical Reports Server (NTRS) · leaf 15
ent is verified in figure 2, which plainly shows very approximate proportionality at all actual flying speeds. It is convenient to employ the polar diagram in the following: This kind of diagram deserves greater popularity than it has yet received in aeronautical calculations in the United States.… … Lay off from O the distance OQ equal to R. Then for any point M, OB=D, MB=L, and OQ=R. The slope of the line QM=^^=tan a Consider equation (3). For a given weight and variable values of L and D, that is, for variable angles of attack, let us fmd-the condition for minimum thrust. L WD)-(D+R) dL…
NASA Technical Reports Server (NTRS)
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