The Gougeon Brothers on Boat Construction - WEST SYSTEM Epoxy

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180 First Production Steps case you may have to move the batten slightly in order to make the section fair. If there is a major error, go back and check through the development process. When everything is right, this transom or angled bulkhead will look similar to the vertical stations on either side, although it will be expanded or more drawn out. Curved Transom Development It is quite common with bigger boats to have a transom that is both curved and raked, either forward or aft, at an appreciable angle. To develop transoms of this shape is a little complicated, but the following instructions and Figure 16-11 provide a fairly standard method. <strong>The</strong> basic principles involved in the development of the curved raked transom are most easily understood if you consider the transom as being part of a cylinder. As with the cylinder, it is curved in one direction (athwartship) and straight in the other (fore and aft or vertical). Looking at the lines plan, you will see that the buttock planes intersect the transom as straight lines, these being elements of the cylinder. You will use these buttocks as you expand or roll out the transom from its curved shape to a flat one. <strong>The</strong> first thing to do is to project an auxiliary view of the after sections of the boat and deck line at a line of sight parallel to the centerline of the transom in profile. (See Figure 16-11.) Begin by extending the centerline of the transom in profile up clear of the other views. As close to the other drawing as possible, draw in an auxiliary grid centerline at right angles to this extended line. Tangent to this intersection, swing an arc of the radius noted on the designer’s plans for the transom. This is the curve to which the transom will be laminated when it is built. Measuring out from the auxiliary centerline, draw in the buttocks parallel to this centerline, spaced as they are in the half breadth plan (a, b, c, d). <strong>The</strong>n project the points where the auxiliary buttocks intersect the design arc of the transom down from this auxiliary view to the corresponding buttocks in the profile view. It is also necessary to determine the true intersection of the sheer and the transom in this auxiliary view. To do this, first project the intersections of the aft two (or three) station lines with the profile sheer up into the view. <strong>The</strong>se projections will intersect the auxiliary centerline at 90°. Pick up from the half breadth plan the distance from the centerline to the deck line or the aft sections. Transfer these dimensions to the auxiliary view, from the centerline out along the station projections. Fair a batten through these marks. This sheer line will intersect the arc of the transom. Next, prepare the grid for the expanded transom. You can use the transom centerline in the profile view as the centerline for the grid or draw a centerline parallel to it but a little away to keep things clear. Lay a batten around the arc in the auxiliary view and pick up the buttock spacing (a�, b�, c�, d�) and the point where the arc intersects the deck line. <strong>The</strong>n transfer these distances, laying the batten straight and at right angles to the expanded transom centerline. Draw in the buttocks parallel to the centerline and also lightly draw the line (parallel to the buttocks) that represents the intersection of the deck line and the transom (e�). This gives one half the true width of the transom if it were laid flat. Go back and identify the points in the profile view where the projections of the buttocks from the auxiliary view intersect the buttocks. Project these points (m, n, o, p) out to the expanded transom grid, where their intersections with their respective buttocks will outline the shape of the transom. If more points are needed for accuracy in developing the shape of the outside edge of the transom, add more buttocks to the body plan in between the standard buttocks. Using a pick-up stick, transfer the heights for the last three stations to the profile view. <strong>The</strong>n follow the process used with the primary buttocks to get the additional points. It will be necessary to know the amount of deck crown, so this, too, should be projected. Some designers give the amount of deck crown as a percentage of beam at any point, while others give a centerline that runs above the sheer line to show the amount of deck crown. We generally allow slightly more material on the transom than is necessary for the deck camber by lightly drawing a line parallel to the sheer, but above it, at least as high as the deck camber will be at the stern. Draw this line far enough to intersect the projected profile centerline of the raked transom. From this point of intersection, draw another line to the intersection of the deck line in the outer corner of the transom. Give this line more
Chapter 16 – Lofting 181 Expanded Transom Figure 16-11 Developing a curved raked transom. Profile Half breadth Auxiliary View
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The Gougeo
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Gougeon Br
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iv Table of Content Getting Started
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vi Table of Content Chapter 17 Mold
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viii Table of Content Later Product
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x Preface The brie
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xii Table of Content
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2 Introduction With the help of fri
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4 Introduction
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Modern Wood/Epoxy Composite Boatbui
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Chapter 2 - Modern Wood/Epoxy Compo
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Wood as a Structural Material CHAPT
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Chapter 3 - Wood as a Structural Ma
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WEST SYSTEM ® Products This chapte
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Chapter 4 - WEST SYSTEM ® Products
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Hull Construction Techniques— An
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Chapter 5 - Hull Construction Techn
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Getting Started Chapter 6 Before Yo
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46 Getting Started Finally, should
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48 Getting Started Designers’ fee
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50 Getting Started
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52 Getting Started Material Price/b
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54 Getting Started between layers o
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56 Getting Started mast; sails and
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58 Getting Started
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60 Getting Started and it is import
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62 Getting Started necessity. We al
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64 Getting Started Grit refers to t
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66 Getting Started An efficient flo
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68 Getting Started Ridge Pole Frame
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70 Getting Started
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72 Getting Started unimproved lumbe
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74 Getting Started If it is not yet
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76 Getting Started chapters, we adv
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78 Getting Started
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80 Getting Started The</str
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82 Getting Started cures quickly to
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84 Getting Started Evap. Rate LEL2
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86 Getting Started 4. Use wet, rath
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88 Getting Started
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Laminating and Bonding Techniques <
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Chapter 11 - Laminating and Bonding
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Scarfing Scarfing remains an essent
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Chapter 12 - Scarfing 109 and used
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Chapter 12 - Scarfing 111 Productio
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Chapter 12 - Scarfing 113 Figure 12
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Chapter 12 - Scarfing 115 Figure 12
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Chapter 12 - Scarfing 117 bevels on
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Synthetic Fibers and WEST SYSTEM ®
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Chapter 13 - Synthetic Fibers and W
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Page 143 and 144: Hardware Bonding As stated earlier
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Chapter 21 - Laminating Veneer Over
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Stringer-Frame Construction While s
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Chapter 22 - Stringer-Frame Constru
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Strip Plank Laminated Veneer and St
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Chapter 23 - Strip Plank Laminated
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Hard Chine Plywood Construction A s
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Chapter 24 - Hard Chine Plywood Con
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Compounded Plywood Construction Mos
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Chapter 25 - Compounded Plywood Con
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Later Production Steps Chapter 26 I
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318 Later Production Steps Figure 2
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322 Later Production Steps Material
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324 Later Production Steps Bulkhead
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326 Later Production Steps Teak ven
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328 Later Production Steps fuel tan
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330 Later Production Steps to the s
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332 Later Production Steps they are
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336 Later Production Steps
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338 Later Production Steps Preparin
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340 Later Production Steps A semici
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346 Later Production Steps Staple p
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348 Later Production Steps After we
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352 Later Production Steps Flat saw
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Review of Basic Techniques for Usin
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Fatigue Aspects of Epoxies and Wood
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Selected Bibliography While the fol
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The Gougeon Brothers on Boat Construction - WEST SYSTEM Epoxy

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