i 9 4 AEROPLANE PERFORMANCE CALCULATIONS 



These speeds are plotted against altitude on page 193, 

 remembering that 800 feet is the altitude for standard density 

 air. The old low speed curve already plotted is produced if 

 necessary to cut the new curve, and the new curve is drawn in 

 from this point of intersection to ground level : the part of the 

 new curve above the intersection is not required, so it is shown 

 dotted. 



To find the top speed on full revolutions we have to find the 

 performance curves at altitudes : we will do this at 2,000, 4,000, 

 6,000, and 8,000 feet, where the values of cr are -962, '900, '843, 

 and 788 respectively. 



For the machine performance curves at the altitudes we get : 





