Calculation of Wing Spars Page: 7 of 13
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- 6 -
If we disregard the influence of P on the moments, we have
Mmax = 1- 036 + (0. ) 0.65
The calculat ion gives the result quickly and exactly for all
safety factors, but presupposes the use of tables. offunctions.
II.
In the limit case a = n, sec I-- = . If the moments to re-
main finite, D must equal 0. This gives
MA +MB =- 2 hk = 2a s
and C, = 0 x a. At least one of the moments MA and MB must be
a function of a .l)
A general investigation of the value
01= (D sec-)_
2 d CL =x;
will be given in a special article. Here I will confine myself
to a simple example. I will take a beam (Fig. 3) centrally load-
ed and resting on three rigid supports, and to whose ends are ap-
plied the moments MA and MB. If a > % then may .> .
This may happen, without exceeding the proportionality limit.
From the equation
V 1 831 g it _ II
+ +oB + + Mm= sggazv
A Ss, BS so C
when, for abbreviation, we write
Sa
there follows
-gsA 'as " r a "- M " 'V
1) See next page. .4 + '
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Müller-Breslau, H. Calculation of Wing Spars, report, August 1921; (https://digital.library.unt.edu/ark:/67531/metadc53634/m1/7/: accessed April 25, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.