BOAT HULL DESIGN 2-59 



Thickness of deck - 3/8 in. core = .375 



- 2 plies cloth = .032 in. (Table 5-2) 



- 2 plies 1-1/2 oz. mat = .081i in. 



- 1 ply woven roving = .037 in. 



.52b in. 



For 550 x 2 = 1100 lb. axial load 



From Table 3-h Try No. 10 - 32 self -tapping thread cuttinr fastener. 

 Required penetration: 



l',/l6 in. gives hOO lb. minimum holding force 



Each additional l/l6 in. gives 2r '°0-^ 00 = 263 lbs. 



Required additional sixteenths = HOO-'-t 00 = ?< 65 _ say 3 



Total Reouired Penetration = ^ + —4. = 7/l6 in. 



16 lt> 



For 275 x 2 = 550 lb. lateral load 



From Table 3-4 a No. 10-32 self -tapping thread cutting screw is satisfactory at 

 3/16 in. penetration. 



The controlling penetration is 7/16 in. which is satisfactory. 



DESIGN EXAMPLE 2-5. CABIN CRUISER 



This cruising power boat represents a type commonly used for pleasure cruising with 

 accommodations for four to six people. It is of the displacement type, with a cruising 

 speed of about 12 knots. 



Principal Dimensions - See Fig. 2-29 for details. 



Length, Over-all: 29 ft. - 3 in. 

 Length .Water Line: 27 ft. - 5 in. 

 Beam: 9 ft. - 2 in. 

 Draft: 2 ft. - 4 in. 

 Speed: 15 miles per hour 

 Engine: 135 horsepower 



S ummary of Scantlings 



Shell Including Transom - Basic Laminate: 1 ply cloth on outside of hull, 1 ply 2 ounce 

 mat, 2 plies woven roving. 



Bottom shell from the bow to Station 7 below Longitudinal No. 3: similar to basic 

 laminate except 4 plies of woven roving. 



Side shell from the bow to Station 7 above Longitudinal No. 3: similar to basic 

 laminate except 3 plies of woven roving. 



