Vol. 64, No. 2 Summer 2019 108


8. Drawing instruments and drawing of Frame 4 showing marks for top of planks on the right along with card stock pattern cut from a tracing.


Start on the lower line. Measure in 2½ inches from the leſt end and, using a right triangle, erect a perpendicular extending up to the half breadth centerline. Label this line “S” or “Stern”. Using the architect’s scale rule and the scale marked 1 or 1 foot = 1 inch, measure to the right 4 feet 1 inch. Here erect another vertical line and label it “X”. Measure another 2 feet to scale to the right and erect another vertical and label it “1”. Continue erecting eight more verticals every 2 feet to scale, labeling them sequentially “2” through “9”. Measure 2 feet 9 inches to the right and erect another vertical and label it “Y”. Measure 7 feet 1 inch to the right and erect a fi nal vertical and label it “B” or “Bow”. T is is the forward end of the hull or bow perpendicular. All vertical lines between the bow and stern are the


location of section planes cutting the hull vertically. Section or Station 5 is the midship and widest hull section.


Now use the table of off sets (Figure 5) to mark all elevations above the base on all the vertices. T e table of off sets is nothing more than a matrix of stations and elevations above the base line at each station. Note that these elevations are measured to the top inside edge of each plank. T ese are not waterlines but profi le views of each plank. Note that the fi rst line is the outside edge of the bottom which, naturally, would be identical with the inside bottom edge of the fi rst strake (STR) or plank.


Page 1  |  Page 2  |  Page 3  |  Page 4  |  Page 5  |  Page 6  |  Page 7  |  Page 8  |  Page 9  |  Page 10  |  Page 11  |  Page 12  |  Page 13  |  Page 14  |  Page 15  |  Page 16  |  Page 17  |  Page 18  |  Page 19  |  Page 20  |  Page 21  |  Page 22  |  Page 23  |  Page 24  |  Page 25  |  Page 26  |  Page 27  |  Page 28  |  Page 29  |  Page 30  |  Page 31  |  Page 32  |  Page 33  |  Page 34  |  Page 35  |  Page 36  |  Page 37  |  Page 38  |  Page 39  |  Page 40  |  Page 41  |  Page 42  |  Page 43  |  Page 44  |  Page 45  |  Page 46  |  Page 47  |  Page 48  |  Page 49  |  Page 50  |  Page 51  |  Page 52  |  Page 53  |  Page 54  |  Page 55  |  Page 56  |  Page 57  |  Page 58  |  Page 59  |  Page 60  |  Page 61  |  Page 62  |  Page 63  |  Page 64  |  Page 65  |  Page 66  |  Page 67  |  Page 68  |  Page 69  |  Page 70  |  Page 71  |  Page 72  |  Page 73  |  Page 74  |  Page 75  |  Page 76  |  Page 77  |  Page 78  |  Page 79  |  Page 80  |  Page 81  |  Page 82  |  Page 83  |  Page 84  |  Page 85  |  Page 86  |  Page 87  |  Page 88  |  Page 89  |  Page 90  |  Page 91  |  Page 92  |  Page 93  |  Page 94  |  Page 95  |  Page 96  |  Page 97  |  Page 98  |  Page 99  |  Page 100