Comparison of model propeller tests with airfoil theory (1925)
NASA Technical Reports Server (NTRS) · leaf 6
241 COMPARISON OF MODEL PROPELLER TESTS WITH AIRPOIL THEORY We have then: dT=L cos a— D sin a (1) dR = L sin a+D cos a (2) We have from the theory of the airfoil: g L = Tc1 A dA u2 (3) d £-=£., A dA (4) where L and D are measured in gravity units and Ic^ Tc2 are nondimensional coefficients. Substi-… … We now define an auxiliary angle j by cot y=L(D=lc1llc, and substitute for Jc2 in terms of irt and tan 7, placing for v? its value, n2 (4 tt3 r2 -f- g2) • This gives the values in the form: g dT=Tcx A dA n2 sec 7 cos (a+7) C4 r' + q2) (7) gr dR = \ A <L4 n2 sec 7 sin (a+7) (4 ■* (8) Whence, summing…
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