i g6 AEROPLANE PERFORMANCE CALCULATIONS 



Plotting these on page 192 we get a full revolutions top 

 speed at 10,000 feet of 101-6 miles per hour. 



The curve of full revolutions top speed can now be plotted 

 on page 193, but, of course, we only use the part of it below its 

 intersection with the full torque top speed curve, while of the 

 latter we only use the part above the intersection. 



This completes the plotting of minimum and maximum 

 speeds at all altitudes up to the ceiling. 



Rate of Climb at all Altitudes. For this purpose we 

 require the curves of P p ', i.e. the curves of P T ' as well as those of 

 P R ' which have already been found : we get : 



since for these altitudes the formula ^ = gives cr 1 = '955, 



882, '813, 748, and '690. The above values of P T ' are also 

 plotted on page 192. 



Using the method of the First Approximation we observe 

 that the rate of climb in feet per minute is given by 



P - P 



C = 33,000^-. 



We will therefore save time by scaling off the maximum value of 

 P p - P only with dividers from the curves of page 192. Hence 

 we get : 



