A propeller 8 ft in diameter, like the one for which characteristics are given in Fig. 14.3, is to be used on a swamp boat and is to operate at maximum efficiency when cruising. If the cruising speed is to be 30 mph, what should the angular speed of the propeller be? Assume ρ = 0.0024 slugs/ft³.

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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