DETERMINE THE ACTION OF A SHIP BRAKE, 



103 



Using a pair of brakes 11.73 ^^^t wide and 14 feet deep set normal to the di- 

 rection of the vessel, the speed being 18 knots, the speed will be reduced to 15.2 

 knots in 500 feet, to 11.6 knots in 1,000 feet, to 7.15 knots in 2,000 feet without the 

 assistance of the propellers in backing. 



Assuming the weight of the vessel at 17,230 tons, the striking blow at 

 18 knots equals 247,300 foot-second tons. 

 15.2 knots equals 176,300 foot-second tons. 

 1 1.6 knots equals 102,700 foot-second tons. 

 7.15 knots equals 39,000 foot-second tons. 

 Using the element of time, the speed will be reduced in 

 50 seconds to ii.i knots. 

 100 seconds to 7.35 knots. 

 150 seconds to 5.85 knots. 

 200 seconds to 4.70 knots. 



The experiments conducted on the U. S. S. Indiana showed very little. The 

 vessel was entirely unsuitable, owing to the fact that there is not a straight line in 



