160 AEROPLANE PERFORMANCE CALCULATIONS 



Example (4). This Example Shows the Fourth Method. 



Suppose W = 5700, 7-2 x 135 



3 = 695, ..'-!- -^-1 



S' = 95, = -9568, 



k^na, = '59, 510 



Ri-135, =-^ = -051, 



R 2 = 375, , 367 x -590 x -95 

 c- c r- - 



f _ J 4 d = -005 1 x -590 x 695 = 2'09, 



1 = _ ' ! > a -5700X14 = 79800, 



,f ' ? ' ^S= -9568 x 2-09 + -051 x -914 



7 1 ~ = 2 -00 + '047 = 2 -047, 



^ 2 = A' = 2-047 x 16-1 = 32-93, 



B' = 2-047 x 7= 14-32, 

 C' = 2*5 x -051 = '1275, 

 D' = 2-5 x 2-09- 1-5 x 2-047, 



= 5-225 -3-070 = 2-155. 

 Now see table on next page. 



The values of P and V are plotted on page 157, and the 

 curve of short dashes is drawn through them, the opportunity 

 being taken to fair the curve slightly where the points are 

 irregular. For most of its length this curve is indistinguishable 

 from the chain dotted curve. 



