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Aviation History
1919
1919 - 0540.PDF
lam APRIL 24, 1919 if the depth of the section is increased from 6'62 ins. to 8*58 ins., the area is decreased, for the same value of the moment of inertia, I, from 14 • 1 sq. ins. to 10 sq. ins., which represents a very considerable saving in weight. This general example should be sufficient to indicate the advantages attending the choice of a deep section for a beam wherever other considerations permit. The increase in depth of the I-section is accom panied by a decrease in the moment of inertia about the vertical axis, and, therefore, the deep section is only advantageous for beams loaded in one plane only. For struts without any lateral loading the most economical section is that which has equal moment of inertia about both vertical and horizontal axes. With I-section struts, the most economical FLIGHT 1 • ^m (v-AmCHi-xrr 1 ft? 5 i 1 s i to f • 5 3 1 8 1 1 1 E * K • fa- K> is fa 6 •0 3 K. U C la 1 S"t v. £ ^ W <|5 i 52 (a * u i s 5? If "4 -0 5 I •s N Kt •» a * * i •a to 3 5 fa K» K> K> % is. n y •> ** i 3 <* & *- It -0 * • i i *• to *• *> •0 f is t •** u •» %- 1 -^ *- •» 1 fa •3 NO K) t i •« I» "1 n E c m -J s »» ii I* •*- B •a 5 m M m 3 L is 1 C -*- ? 1- 5i 1 •s ^ fe ^ f X ^ fa 1 to H to "1 1 to •a fa I N 9 3 •a. <* i fa si -0 •it S t- •s. U fa fa (a •a i to i • 15 •0 •^ * ** §1 | * «* L i- •s to U 2 5: 5 <* •ft l •D fa la is •> l *- % fa *« « *- >< * b 10 K> K> U •0 5; fa $ c. fa it 5 3 5; K> «* ^ fa u <* •0 * <* ? u 4 it to to Kl 8 to 5 ^ b u K» -0 •S •5 fa •> "3 -0 >o fa Uk i N» to fa & $ R K» *» B «K (a v. •0 1 •^ ? b 0 % K> i | 51> s m 5> & ^ -? Kl •< •< ^ •< N -< -< 3s J? -< •< -< i 6 X 5 -< N 3 a> & N -< Kl -< •< 5i M 9t Nl *' d 1 S 5 Cn 1 S40
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