Now I’ll create sketches of the various hull curves.
For the topmost line, I will create a curve following one of the bulwark lines on the plan. To ensure correct placement, I create a construction point at the tip of the bow, which will be used as a starting point for the curve. A fit point spline is created in a horizontal plane following the curve as viewed from above.
Then the points on the spline are adjusted up or down to fit the curve as viewed from the side and front.
In the picture below, the curve is viewed from the front and back showing how it follows the plan.
Next is a sketch for the rabbet line. It is composed of several lines and curves. The sketch is drawn in the false keel thickness offset plane. The same starting point at the bow is used to start the bow curve, meaning that the bulwarks curve and bow curve intersect at that point.
Here are the two sketches so far.
Now I select the construction plane for station 1, then go to Sketch -> Project/Include -> Intersect and click on the existing lines to find the points where they intersect with the plane. This is repeated for each station plane. The intersection points are displayed as purple circles.
Using the intersection points as start and end points, a fit point spline is sketched for each station following the curves on the body plan.
Why all the intersection points? Later on, I’ll be using the loft and rails feature in the Fusion 360 sculpt environment. Loft creates a surface between two or more curves (profiles). Rails can be used to adjust the flow of the loft. However, all rails used in a loft must intersect all profiles. To make sure all the curves intersect as needed, I find the intersection points first, and draw fit point splines using those intersection points.
Next time, sketching continues.