1 86 AEROPLANE PERFORMANCE CALCULATIONS 



view, 4 centre section bracing wires -inch stream-line 4 feet 

 9 inches long, 4 centre section incidence wires -^-inch stream-line 



4 feet o inches long in front view, and 8 tail control wires I 5 cwt. 

 cable 3 feet o inches long in front view. Then observing that 

 the diameter of 15 cwt. cable is -137 inches we have 



^=025 x -375(72 + 250 x -375) x 2 

 + -025 x -25(72 + 250 x -25) x 6 

 + 025 x -688(54 + 250 x -688) x 2 

 + -025 x -437(54 + 250 x -437) x 2 

 + -025 x -25(57 + 250 x -25) x 4 

 + -025 x -5(48 + 250 x -5) x 4 

 + -26 x -i 37(36 + 200 x -1 37) x 8 



= 3-11 + 5 -05 + 778 + 3 -57 + 2-99 + 8-64+ 18-05=49-2 . () 

 Hence we have 



RI = 36-5 + 6-5 + 1 2-6 + 8-9 + 10-7 + 32-5 + 49-2 =157 / (X) 



Parts Outside the Slip- Stream : 



The tail plane, or rather the half of it outside the slip-stream, 

 gives 



r-i = 32-5 - - - - (X) 



The struts outside the slip stream are 2 front outer gap struts 

 i^ inches x 7 feet 6 inches, 2 back outer gap struts if inches 

 x 7 feet 6 inches, 2 front inner gap struts I-J inches x 7 feet 

 6 inches, 2 back inner gap struts if inches x 7 feet 6 inches, 

 of 2 front chassis struts 2 inches x 2 feet 3 inches, | of 2 back 

 chassis struts, if inches x 2 feet 3 inches, I axle 2f inches x 



5 feet 6 inches, and 4 aileron king-levers I inch average x i foot 

 o inches. 



Taking all these struts also as R.A.F.4.Z. section, 

 a = 2 x 1-5 x 7-5 + 2 x 1-375 x 7-5 + 2 x 1-875 x7'5 

 + 2X1 75 X7 -5 + X2X 2X2-2 5 +- X 2 X I 75 X 2'25 



+ i x 2-625 x 5-5 + 4 x i xi 



= 22-5 + 20-6 + 28-1 +26-3 + 4-5 + 3-9+ 14-4 + 4-0 



= 124-3 



and x= -215 



.-. r 2 = 124-3 x -215 = 267 . . (X) 



The wires outside the slip-stream are 4 outer incidence wires 

 J-inch stream-line x 7 feet 6 inches, 4 inner incidence wires 

 f-inch stream-line x 7 feet 6 inches, 2 front outer flying wires 

 f -inch stream-line x 1 2 feet 4 inches, 2 back outer flying wires 

 T Vinch stream-line x 12 feet 4 inches, 2 front outer weight 

 wires J-inch stream-line x 1 1 feet 7 inches, 2 back outer weight 

 wires J-inch stream-line x 1 1 feet 7 inches, 2 front inner flying 



