Before I embark on cutting and installing drop planks on my Bounty, I wonder if someone can confirm for me that I understand it fully. Clearly the idea is to reduce the number of planks (strakes) running to a given area when that area to be filled is too narrow to accommodate the number of planks required further back toward midship, and the taper to make it work would be too radical (more than half the width of the planks). In looking over the pictures in the tutorials, it appears to me that the process is like: (1) two planks are tapered down to where they are half the width of the drop plank where they will join the drop plank. (2) a 45 degree cut is made to the ends of each of these planks, forming a 90 degree rebate where the two come together. (3) the drop plank is cut to a 90 degree point to fit into the end of the original two planks. (4) the drop plank is itself tapered down to an appropriate width at its end point.
The part that I am unsure of is this.... do the rules of tapering apply still? Are the original two planks tapered only on their top edge? And is the drop plank also tapered only on the top? Is there any rule of thumb that the first two planks should be tapered to half of a full plank so that the drop plank can start by being a full width plank (with of course the 90 degree point cut)? If the first two taper less than half a plank, then it would be impossible for a full width drop plank to fill up that 90 degree rebate. But if the taper goes to more than half the plank width, then the drop plank must also be cut to less than its full width where it joins them. In other words, is it true that the first two planks must taper to exactly half the width of the drop plank and that width cannot exceed (obviously) the width of the planks being used.