766 



BODY PLAN 



HYDRODYNAMICS IN SHIP DESIGN 



Sec. 76.8 



PROFILE 



Chine Lencjth Lq 

 Fig. 76.D Diagram Illustbating Layout of Developable Surfaces for a Small V-Bottom Boat 



(3) First establish arbitrarily the deck edge at 

 side or sheer profile, the chine profile, the baseline 

 in the profile, and the chine planform by drawing 

 them in the customary manner for orthogonal 

 projection. It is necessary to draw the sheer 

 profile of the deck in approximately its proper 

 relation with respect to the chine profile. In the 

 example given by Hartman and utilized here, the 

 baseline in the profile happens to coincide with 

 the centerline in the plan view. It is required to 

 find the deck edge in plan, the keel profile, and 

 the stem profile, and to make the orthodox lines 

 drawing with section lines and buttocks. 



(4) For laying out the side, place the apex S in 

 the profile at a height of about 0.5 to 0.75 times 

 the chine (or overall) length Lc above the chine 

 beginning C at the stem, and slightly forward of 

 that beginning (0.1 Lc in the figure) 



(5) Place apex T in the plan (opposite apex S and 

 in the plane of the projection of that apex in the 

 plan view) at a distance from the centerhne, on 

 the same side as the plan view to be drawn, 

 approximately equal to the length of the half- 

 chine beam IZ at the transom 



(6) To get the proper rounding and fullness of 

 the forward deck, the apex U in the profile, for 

 the forward portion of the side, is to be lower 

 and farther aft than the apex S in the profile. 

 Its position is fixed presently. 



(7) Apex A in the profile, for the conical bottom 

 surface, is located about 0.2 or 0.25 Lc ahead of 

 the chine beginning C. Its vertical position below 

 the chine beginning determines the depth of the 

 forefoot and the rise of floor in the forward sections. 



(8) Apex B in the plan is located opposite apex A 

 and across the centerline from that side of the 

 bottom to be drawn. It is positioned laterally at 

 about the distance 0.5 Be from the centerhne. 



(9) Divide the chine length Lc into a convenient 

 number of equidifferent station lengths; there 

 are four such lengths in Fig. 76. D 



(10) Draw a side generatrix from the point F 

 along the chine profile at Sta. 1 by laying down a 

 straight line from F to the apex S. This intersects 

 the sheer line already drawn at D in the profile. 



(11) Lay down the plan view of this generatrix 

 by drawing a straight hne from F in the plan 

 view to apex T 



