3-4 



DESIGN DETAILS 



Fig. 3-4 indicates a connection with a vee or scarf joint in the deck. Fig. 3-5 indi- 

 cates the same basic connection with a vee or scarf joint in the shell rather than the deck, 

 but incorporates a molded in deck edge coaming. Usually, joint selection depends on the 

 molding procedure. The joint shown in Fig. 3-4 may be used when the shell is molded in 

 two halves, while that in Fig. 3-5 may be used when the shell is molded in one piece. 

 Although this is not recommended, the joints in Figs. 3-4 and 3-5 may be made without 

 the additional exterior fiberglass reinforcement. If this is done, the vee joint is pre- 

 ferred since a better bond will be obtained. In any case, the total joint reinforcing 

 laminate should be at least equal in strength to the weaker of the laminates joined. 



PRE-MOLDED 

 DECK LAMINATE 



VEE OR SCARF' 

 JOINT 



WOOD COAMI NG 

 IF DESIRED 



FIBERGLASS JOINT 

 REI NFORCEMENT 



PRE-MOLDED 

 SHELL LAMINATE 



Fig. 3-4. Deck Edge Connection - 

 Wood Coaming and Joint in Deck 



IBERGLA55 JOINT 

 REI NFORCEMENT 



COAMI NG MOLDED 

 I N DECK 



VEE OR SCARF 

 JOI NT 



PRE-MOLDED 

 SHELL LAMINATE 



Fig. 3-5. Deck Edge Connection - 

 Molded in Deck Edge Coaming with 

 Joint in Shell 



Fig. 3-6 indicates a shell to deck connection commonly used in small boats. It has 

 the advantage of minimizing requirements for dimensional accuracy and provides an easy 

 means of attaching a rubbing strip. The through bolts in this joint may be eliminated by 

 clamping the deck and shell edges together until the ply of resin impregnated mat in the 



joint is cured. The edges are then ground 

 flush and, if necessary, interior reinforce- 

 ment placed, and finally the snap -on rubbing 

 strip is added. This strip may be of metal 

 or plastic. 



PRE-MOLDED 

 DECK LAM I NATE 



1 PLY MAT IN JOINT 



FIBERGLASS JOINT- 



REI NFORCEMENT 



RUBBING STRIP 



ROUGH BOLTS 



PRE-MOLDED 

 ELL LAMINATE 



ALTERNATE CONSTRUCTION SPLAYING 

 ENDS TO TAKE SNAP ON STRIP 



Fig. 3-7 indicates the use of a lap joint 

 combining bonding with through fastening. 

 The hull and deck molds may be easily made 

 so that the faying or connecting surfaces of 

 the joint are vertical. The small strip shown 

 may be added to provide a ready positioning 

 means. 



Fig. 3-6. Deck Edge Connection - Fig< 3 _ g illustrates a connection utilizing 



Small Boat Type with Snap in Place & prefoamed resin or a troweled in place 



Rubbing Strip filled resin> described in Chapter 4. This 



type of joint maintains the rigidity and strength of the sandwich construction deck right to the 

 deck edge. In making this joint, the shell and deck laminates are joined in a manner similar 

 to that shown in Fig. 3-4. A filled resin is then troweled in place, or a prefoamed resin is 

 shaped and set in place and the second reinforcing laminate is added. The advantage of this 

 joint is its high rigidity and strength without the addition of exterior layers of reinforcement 



