FORM OF JETS 



125 



5 feet above the level of the orifice, and if, when the head of water in the 

 tank is 4 feet, the discharge is 205 Ibs. per minute, while a weight of 



Fia. 68. 



8*35 Ibs., with a horizontal leverage of 1 foot, is required to keep the tank 

 vertical, determine the coefficients of velocity, contraction, and discharge. 



Answer. C v = '98 ; C c = '638 ; C = '625. 



(3) A boat, having jet propulsion, moves at 10 miles per hour. The 

 water leaves the nozzles with a relative velocity of 40 feet per second. If 

 1,500 Ibs. per second are passed through the pumps, determine the pro- 

 pelling force on the vessel. 



Answer. 1,180 Ibs. 



