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Aviation History
1937
1937 - 1605.PDF
JUNE 17, 1937 37 THE AIRCRAFT ENGINEER SUPPLEMENT TO FLIGHT 608c I-I75 2.85 FIG. 10. = .412 From graph 1 : — = .315 a •'• kxx = .315 X 1.175 — .370 in. .-. lxx = .390 X .370s = .0534 in.* y d •774 •'• V = -774 X *-*25 = -909 in. Applying corrections : 6 = 6o° and 1200 From graph 2 : B = 1.36 and .11 0 I -2 • GRAPH. I. %o»4t Fie.11. .". Corrected Ixx <*= .0534 + .0105 = .0639 in.* yt = 1.25 + -75 sin 300 - .909 = I25 + -375 — -909 = -716 in. . z _ 0639 0.639 .909 .716 = .703 in.3 or .892 in.3 APPENDIX Derivation of Equations for Constants of Channel Section. For channel section shown in Fig. 1, A = t(b + zd) .: Gain of A = - X .122 X 1.36 -f- - x .152 X .11 2 2 = .0098 + .0012 = .011 in.2 20 c a IS 1-0 -5 B , 1 \ 1 tf^ ^C ' ' 1 • 1 ' GRAPH. 2. CONSTANTB IMC - - - - - Neglecting loss of area due to bends __ i d* + bd) y ~ t(b + 2d) Q •2 \ 1 \ - - 1 1 _ In ' 1 ' l ' GRAPH. 3. r CONSTANT 1 1 " D - - 40 50 60 70 oc*oa/9* 80 90 .'. Corrected A = .390 + .011 = .401 in.2 a = 300 From graph 4 : E = 25 '•5 x -15* " B, .". Gain of I, 12 X 25 = .0105 m. -05 1500 1000 800 600 400 soo 150 100 80 60 E 50 40 SO 20 15 10 8 6 2 2 IS IO \ s GRAPH.4. \ \" \^J lKr ?~ \ s| >?•» y [_^£ CONSTANT E ^^ ^\ ^Or. ^-*v^ r ^^ *"^<^ K. l*~^fc. "**•'»— * •*„ ~~~~ 25 -SO
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