A TYPICAL MACHINE 



191 



corresponding altitude is the ceiling, therefore the actual speed 

 V is given by 



V is plotted against altitude of page 193, and what is ob- 

 tained is really the curve of minimum speed under full power 

 and the curve of top speed on full torque : in order to obtain the 

 curves of overall minimum speed, and overall maximum speed we 

 must supplement these curves by the curve of minimum speed 

 throttled, and the curve of top speed on full revolutions. 



Meanwhile we observe that the maximum altitude attain- 

 able (what is ordinarily called the "ceiling") is 14,200 feet, 

 and occurs at a true speed of 82 miles per hour. 



Top Speed and Minimum Speed at Altitudes. The 

 minimum speed throttled in standard density air is 55-0 miles 

 per hour. Therefore the minimum speeds throttled at altitudes 

 of 2,000, 4,000, 6,000, 8,000, 10,000, and 1 2,000, where the values 

 of o- are -962, -900, '843, 788, 740, and '694 respectively are 

 given by the formula 



v-X 



as 56-1, 58-0, 59-9, 62-0, 64*0, and 66 -o respectively. 



