EXAMPLES 413 



determine the probable horse-power of the engines if the resistance of 

 the model at the corresponding speed is 9*54 Ibs. Assume 60 per cent, 

 of the I.H.P. to do useful work at the propeller, and assume wetted area 

 of ship = 48,000 square feet ; n for ship = 1/83 ; for model 1*85. 



(Corresponding speed = 4*38 knots. 

 Answer - 1 I.H.P. = 25,600. 



