A TYPICAL MACHINE 



195 



These are plotted on page 192. 



For the constant revolutions propeller performance curves at 

 the altitudes we get : 



These also are plotted on page 192, and from the inter- 

 sections of these curves with those of the previous table we find 

 the top speed for full revolutions for standard density air, 2,000, 

 4,000, 6,ooo,and 8,000 feet to be 105-0, 105*0, 104*5, 103*6, and 

 102*8 miles per hour respectively. 



On plotting these speeds on page 193 we see that we have 

 not yet carried the investigation to high enough altitudes : we 

 must therefore get our performance curves at 10,000 feet, where 

 o- == 740. 



For the machine performance curve we have velocities of 

 213-0, 150*5, 1227, 106-2, 94*8, 86*0, 79-3, 73*5, 68*6, and 64*0, 

 corresponding to horse-powers of 1313, 484, 276, 193, 152, 137, 

 127, 126, 129, and 141, and for the P R ' curve we have for velocites 

 of 32, 48, 64, 80, 96, and 112, horse-powers of 93, 129, 154,171, 

 176, and 169. 



