Calculation 3. Section Modulus — Clear Beveled Sections 

 {The notation used in this calculation is shown in Fig. 5) 



Section width (W) Inches 



Section depth (D) Inches 



V = (IF - 1.25") ^ 2 Inches 

 U = V - .3248" Inches 



A reas: 



T Sq. Ins. 



Rl Sq. Ins. 



R2 Sq. Ins. 



R3 Sq. Ins. 



Total 1 

 / = h+ (.1875" -^ 3) 

 r\ = h+ (.1875" -r 2) 

 r2 = h- (1.59375" -h 2) 

 r3 = 1.78125" -^ 2 

 Moments about MM: 



Tt 



R\r\ 



Rlrl 



RlrZ 

 Total 2 

 c = Total 2 -^ Total 1 

 d/ = / - c 

 dr\ = r\ — c 

 drl = r2 — c 

 dr3 — c — r3 

 Moments of Inertia: 



IT 



IRl 



IR2 



IRS 



T{dty 



Rlidriy 



R2{dr2Y 



RSidrSy 



I Ins." 



y = D — c Inches 



Section Modulus: 



S = I ^ y Ins.« 



Center Section 



3.25 



4.25 



(2r) 



.0609 



.4876 



5.1797 



5.7891 



20.3239 

 2.1359 



9.52 



Pole Pin Hole 



Section 



3.25 



4.25 



1.00 



.6752 



.0304 



.1266 



4.0625 



6.2044 

 2.1373 



ihS) 2.9029 

 S = 5.81 



116 



