3-8 



DESIGN DETAILS 



mold extending slightly up into the centerboard trunk provides a means of locating the trunk 

 and a smooth mold face surface which will minimize the secondary bond leakage problem 

 mentioned above. 



FIBERGLASS JOINT 

 REI NFORCEMENT 



P RE-MOLDED 

 SHELL HALVES 



BASIC SHELL, 

 LAMINATE 



-VEE JOINT 



1 PLY LIGHT MAT AND 

 1 PLY CLOTH 



Fig. 3-21. Connection of Shell 

 Halves - For Small Boats Only 



Keel Ballast to Hull 



LOCAL FIBERGLASS 

 REI NFORCEMENT 



LARGE WASHER 



BOLTS CAST IN 

 BALLAST 



Fig. 3-22 indicates a common means of 

 attaching outside ballast to the hull. The 

 large washer shown is essential to prevent 

 the securing nut from crushing the laminate. 

 The local reinforcement is necessary to 



prevent the washer from shearing through the laminate, and to provide bearing for the bolt 

 to enable it to resist sidewards thrust. 



Fig. 3-22. Ballast to Hull 

 Connection 



Repair Joint 



Fig. 3-23 shows a type of connection commonly used in repair work and which may be 

 used anywhere a butt joint requires surface appearance combined with strength. The joint 

 reinforcement should be equivalent to the basic laminate for continuity of strength. 



SAND OR 

 8 TO 1 S 



Ml NIMUM 



PRE-MOLDED 



LAMI NATE 



BACKING PLATES 

 BE REMOVED 



OR OTHER 

 F I LM 



-MOLDED I N PLACE 

 JOINT REINFORCEMENT 



PREFERRED CONSTRUCTION 



PRE-MOLDED 

 LAM) NATE 



SAND OR GRI ND TO 

 8 TO 1 SLOPE 



Ml NIMUM 



PRE-MOLDED 

 LAMI NATE 



-OPTIONAL BACKING PLATE 



— CELLOPHANE OR OTHER 



SEPARATING FILM 



//g^jm^hm/. 



BACKI NG PLATE 

 TO BE REMOVED 



-MOLDED IN 

 PLACE JOINT 

 REI NFORCEMENT 



PRE-MOLDED 



LAMI NATE 



t. ACCEPTABLE ALTERNATE 



Fig. 3-23. Butt Joints 

 Bulkhead or Frame to Deck or Shell 



Fig. 3-24 shows one of the most common connections, particularly in larger boats 

 having accommodations. This basically is a connection between the shell or deck and any 

 member perpendicular to it. This connection performs the dual function of making the joint 

 and reinforcing the shell at a rigid support. The fillet pieces indicated are to ease the 

 hard spot caused by the connected member. A detailed discussion of hard spots is given 

 later in this Chapter. The fillets also prevent resin richness in the corner. The fillets 

 may be made of balsa, foamed plastic or a filled resin troweled in place and allowed to 

 set before the joint reinforcement is added. 



