DESIGN DETAILS 



3-7 



SEPARATELY MOLDED 

 GUNWALE 



1 LAYER OF MAT 

 I N JO) NT 



5IDE SHELL 



F I BEPGLASS JOt NT 

 REI NFORCEMENT 



PRE-MOLDED 

 SHELL HALVES 



THROUGH BOLTS OP 

 RIVETS 



TROWELED I N PLACE 

 F I LLED RESI N 



1 PLY MAT REINFORCEMENT 

 I N JOI NT 



Fig. 3-17. Separately Molded 

 Fiberglass Gunwale 



Fig. 3-18. Connection of Shell Halves 

 Centerline Skeg 



Fig. 3-18 indicates a detail suitable for boats such as lifeboats, cruising power boats 

 and small open boats where a small keel is desirable for directional stability. The joint 

 reinforcement as shown, also prevents leakage. If a flat bottom is desired, the joining 

 flanges may be turned inboard and the joint reinforcement placed outside. 



FIBERGLASS JOINT 

 REI NFORCEMENT 



PRE-MOLDED 

 HALVES 



LEAD OR CAST IRON BALLAST 

 SET IN RESIN IMPREGNATED 

 MAT REINFORCEMENT 



Figs. 3-19, 3-20 and 3-21 indicate 

 various means of forming a similar connec- 

 tion for a sailboat. Note that where heavy 

 ballast is required in these boats, it is set 

 in wet mat reinforcement during or after 

 joining the shell halves. The ply of mat 

 covered by a layer of cloth indicated out- 

 board at the joint in Figs. 3-20 and 3-21, is 

 intended to keep water out of these secondary 

 bonded joints which are susceptible to de- 

 lamination under water pressure. The joint 

 at the base of the centerboard trunk shown in 

 Fig. 3-20a is used when the shell is molded 

 in one piece and the centerboard trunk added 

 later. The alternate construction shown in 

 Fig. 3-20b is used when the centerboard 

 trunk is premolded and set in the wet lami- 

 nate during the molding of the shell. The 

 lower flange of the trunk is covered by the inner layers of the shell laminate. The use of a 



PRE-MOLDED 

 CENTER BOARD TRUNK 



FIBERGLASS JOINT \ 

 REI NFORCEMENT 

 INBOARD AND OUTBOARD 



Fig. 3-19. Connection of Shell Halves 

 Cruising Sailboat with Ballast 



FIBERGLASS JOINT 

 REI NFORCEMENT 



E-MOLOED 

 ERBOARD TRUNK 



FIBERGLASS J01NT„ 

 REI NFORCEMENT 



1 PLY L I GHT MAT 

 AND 1 PLY CLOT 



MOLD 

 b. PRE-MOLDED TRUNK SET IN SHELL 



LAMINATE DURING MOLDING 



.TRUNK AND SHELL MOLDED SEPARATELY 



Fig. 3-20. Connection of Shell and Centerboard Trunk 



