X1010 portional to dP/dV, must be the same for the power- (A9) 88 V required as for the power-available characteristics. ND Thus, equating (A8) and (A14) and solving for di\\dJ, tr, relative air density. 1^=0.02935 V, true speed of the airplane (m. p. h.). (A15) b. hp., engine brake horsepower. N,… … dJ Figure 18.—Chart lor calculating i^dJts a function ol Jurh; A„ and Rk. An equivalent expression for dRpjdRs for the propul- % is multiplied by A/'4. By the definition of A, as sive unit must now be obtained... given by (20) For constant-speed-propeller control, the brake horsepower is constant…
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