Like so many other tasks on this boat, determining the final shape of the bow tops was nowhere near as complicated as envisaged. Once I had the sanding longboard in hand, ready to attack it, I realised that it was all purely mathematical. There existed five planes, and three large-radiused curves, all of which could be projected to an imaginary intersection point. Then this imaginary point needed to be curved and rounded over with an imaginary radius. The only decision to be made was how curved to make it. I decided to match it (by eye only) to the curve at the base of the bow (ie where it meets the keel). So it was simply a matter of sanding, adding on more “bog”, sanding, until this imaginary shape became a reality.
Port bow shaping finished below.
Port bow with first layer of double bias glass applied.
The next two photos show the second layer of double bias being applied.
Here’s a short video showing how I managed to shape the flat piece of glass fabric to match the surface.
The Scrumble Project 