BOAT HULL DESIGN 2-37 



Length, Water Line: 18 ft. - 6 in. 



Beam: 7 ft. - in. maximum 



Draft, at rest: 8 in. 



Speed = 38 miles per hour 



Power = 2 outboard motors at 50 horsepower each 



Summary of Scantlings 



Shell Laminate: Bottom forward of Station 7 and side forward of Station 4-1/2; 1 ply 

 cloth on outboard face of shell, 3 plies 1-1/2 ounce mat and 1 ply woven roving. 



Note: For rugged service, where maximum impact strength is required, a higher 

 strength laminate of 1 ply cloth, 1 ply 2 ounce mat, and 3 plies of woven roving could be 

 used with a slight change in longitudinal size. 



Bottom aft of Station 7 and side aft of Station 4-1/2; 1 ply cloth on outboard face of 

 shell, 2 plies 1-1/2 ounce mat, and 1 ply woven roving. 



Note: Same note as above applies except use 2 plies of woven roving. 



Shell Framing: Longitudinals No. 1,2,3 and 4 - Size as shown on Fig. 2-22. Forward 

 of midship transverse, 5 plies of woven roving. Aft of midship transverse, 6 plies of 

 woven roving. 



Longitudinals No. 5 and 6: 2 in. deep x 2 in. wide with 4 plies woven roving. 



Deck Laminate: Fore Deck, Side Coaming, Motor Well and Transverse Midship Island: 

 1 ply cloth on top of deck, 2 plies 1-1/2 ounce mat, and 1 ply woven roving. 



Deck Framing: Fore Deck, 1 in. deep x 4 in. wide. 2 plies woven roving. 



Cockpit Deck: Sandwich construction, core 1/4 in. thick. 1 ply woven roving top and 

 bottom; 1 ply cloth on top, optional - for appearance. 



Transom: Sandwich construction; 1-1/2 in. Douglas fir waterproof plywood core. 

 Laminate; after face, 1 ply cloth, outboard, 2 plies 1-1/2 ounce mat; forward face, 1 ply 

 woven roving, inboard, 1 ply 1-1/2 ounce mat against plywood. Increase thickness at motor 

 support area as specified by OBC standards, Table 2-1. 



Bulkheads: 1/2 in. thick core, 1 ply cloth each side, 1 ply 1-1/2 ounce mat each side 

 against core. 



Deck Connecting Angles: 2 in. x 2 in. angle, 5 plies of woven roving with polyester resin. 



Design 



Bottom Shell Laminate: The bottom shell design loads are taken from Figs. 2-14 and 

 2-15. An example of the calculation for maximum design pressure is given, and the com- 

 putation for the shell laminate are arranged in tabular form for convenience, Table 2-3. 



The bottom shell laminate is given for two types of laminates, Type A and Type B. 

 As explained previously, the Type A laminate is the more expensive, but has higher impact 



