BOAT HULL DESIGN 



2-41 



At Bulkhead, Station 3 

 F x = 1.00 



F L = 0.36 



Pq = 0.3 + 25.0 x 1.0 x 0.38 = 9.8 psi 

 At Transverse 



F 1 = 0.93 



F L = O.ljO 



PJ3 = 0.3 + 25.0 x 0.93 x O.ItO = 9.6 psi 



ofl + 96 



Average Design Pressure p^ = — '-?— = 9.7 psi 



TABLE 2-5. BOTTOM LONGITUDINALS 



* These longitudinals are considered bottom longitudinals in this area because they are subject to impact loading. 



** Fig. 6-37 does not have the proper stiffener laminate to shell laminate ratio for these stiff eners. When height 

 limitations make this necessary, the stiffener laminate should be considered as controlling and a margin allowed 

 in selecting a stiffener. The section modulus for the proposed stiffener - shell combination should be calculated 

 separately. 



11 Ultimate compressive stress, 



, , from Table 5-11. 



The longitudinal stiffener sizes determined from the bending moments must be checked 

 for shear. A typical calculation is shown. The remaining stiffeners have been checked 

 and found satisfactory. 



