The efficiency of a propeller np for the range of advance ratios j between 0 and 2 is 400j2 given by the relation 77,r, (j; β) = (b-10j)/(1+14bj), or 15 b s55 where β is the propeller pitch angle in degrees and j-vo/nd is the advance ratio a) plot sufficient number of efficiency curves and find the maximum efficiency graphically and estimate the range advance ratios j for which the efficiency is b) find the relation between the advance ratio, j, and pitch angle, β, that maximizes c) calculate the advance ratio that yields max efficiency when pitch angle is 35 d) calculate the pitch angles {1/max, β(j2)} and {una , β(j-25)} for which the propeller greater than 0.7 when 150 β 450 the propeller efficiency deg. and the corr efficiency is maximum (仞max, β(j-2) denotes the pitch angle for j-2 that yields a esponding max efficiency maximum efficiency) and the corresponding max efficiencies.