A TYPICAL MACHINE 187 



wires --inch stream-line x 10 feet I inch, 2 back inner flying wires 

 iVincn stream-line x 10 feet I inch, 2 front inner weight wires 

 f-inch stream-line x 9 feet 7 inches, 2 back inner weight wires 

 T Vinch stream-line x 9 feet 7 inches, and 4 aileron cables 

 1 5 cwt. x i foot o inches in front view. 



. -. r 2 = -025 x -25(90+ 250 x -25) x 4 

 + 025 x 375(90 + 250 x -375) x 4 

 + -025 x 375(148 + 250 x -375) x 2 

 + -025 x -312(148 + 250 x -312) x 2 

 + -025 x -25(139 + 250 x -25) x 2 

 + -025 x -25(1 39 + 250 x -25) x 2 

 + -025 x -5(121 + 250 x -5) x 2 

 + 025 x '437(121 +250 x -437) x2 

 + 025 x -375(115 + 250 x -375) x 2 

 + -025 x -312(115 + 250 x -312) x 2 

 + -26 x -137(12 + 200 x -137) x4 

 = 3-94 + 6-89 + 4-5 3 + 3-53 + 2-52 + 2-52 + 6-1 5 

 + 5-04 + 3-91 +3-02 + 5-40 = 47-5 . . (X) 



The wheels for a machine of this weight will be 2 wheels, 

 900 x 200, and we will suppose them fully shielded. 



.-. r 2 = -000062 x 900 x 200 x 2 = 22-3 (X) 

 The " flat plate" list includes 1-5 square feet for the shock 

 absorbers and chassis fittings and -3 square feet for the ordinary 

 wing fittings at the ends of the gap struts. 



.-. r 2 = 29 x 1-8= 52-2 . . . (X) 

 Hence we have, on adding up, 



R 2 = 32'5 +267 + 47-5 + 22-3 + 52-2= 181 . (X) 



and Ri=i57 (X) 



it being convenient to have R a and R 2 together for future 

 reference. 



Wing Characteristics. Aspect Ratio = ~-^r == -8 (X) 



Gap/chord = ^ =1-25 (X) 



6 o 



Stagger = 6 . . . . . (X) 

 Wingtips=|^= -75 (X) 



Also if we take the data for No. 64 Wing Section from the 

 tests quoted on page 87, 



Dimensions = 3 x 40 = 120. . . (X) 



