1 8 AEROPLANE PERFORMANCE CALCULATIONS 

 Again, 



\ V / 



T' V 

 = ^ TJ from equation (3) 



P ' /P \ 



= -rf- from equation (4) . V P J 



XT \* T / 



TT' 



= TJ from equation (2) 



r - F' 



= -j pr from equations (7) and (8). (13) 



Q'N' 

 Now I = nAT I from equation (12) 



ON 

 I = -Tl from equation (11) 



N' 

 F' = -rrF from equation (10) 



N 

 and F = ^F from equation (9). 



Using these last four equations in (13) we have 



Q'N' N_' 

 /V\ 3 _ 1QN 1 " ~N F 

 QN T N 



~ N* 



Q' 



V - 





from equations (5) and (6) 



where 



V <7/- F 



vv . T _ p from equation (i) 



V 



"iy 



a - p 



