A propeller 8 ft in diameter has the characteristics shown  in Fig. 14.3. What thrust is produced by the propeller when it is operating at an angular speed of 1200 rpm and a forward speed of 30 mph? What power input is required under these operating conditions? If the forward speed is reduced to zero, what is the thrust? Assume ρ = 0.0024 slugs/ft ³.

In figure 14.3

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0.06 60 0.05 50 0.04 40 0.03 Ст 0.02 20 Cp 0.01 10 0.1 0.2 0.3 0.4 0.5 nD Cpand Cr Efficiency, percent