Chapter 2-SHIP DESIGN AND CONSTRUCTION 



FRAME 



STRINGER 



FILLER 

 PLATE 



FRAME 

 (CONTINUOUS) 



INTERCOSTALS 



WELD 



WELD 



147.16 



Figure 2-12.— Intercostal and continuous frames. 



BILGE KEEL 



147.17 



Figure 2-13.— Bottom structure. 



from one type of ship to another. The external 

 shape shown in figure 2-15 is commonly used 

 on combatant ships. This form is essentially 

 bulbous at the forefoot, tapering to a sharp 

 entrance near the waterline and again widening 

 above the waterline. Figure 2-16 shows the 

 relationship between the stem assembly and 

 the keel. Internally, the stem assembly has a 

 heavy centerline member which is called the 

 stem post (not illustrated). The stem post is 

 recessedS along its after edge to receive the 



This recess is called a rabbet. 



shellplating, so that the outside presents a 

 smooth surface to cut through the water. The 

 keel structure is securely fastened to the lower 

 end of the stem by welding. The stem maintains 

 the continuity of the keel strength up to the main 

 deck. The decks support the stem at various 

 intermediate points along the stem structure 

 between the keel and the decks. 



Triangular plates known as breast hooks 

 are fitted parallel to and between the decks or 

 side stringers in the bow for the purpose of 

 rigidly fastening together the peak frames, the 

 stem, and the outside plating. 



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