Not directly a boat design, but connected to boats and stability!
Anyone interested in building his or her own upright floating boathook? There was ago an article in WBon the topic a couple of years ago, giving some empirical data for the problem. I thougt it would be interesting to solve the problem theoreticaly. It works:
Here is how you use the diagrams shown below: Get a nice boat hook fitting and weigh it to get its mass. Select a wooden handle in terms of diameter and wood type and, using the upper diagrams showed below, find out (for your hook mass, wood type and handle diameter) the maximum length of the handle allowed for a stable, upright swimming boat hook (if the fitting is attached!). The corresponding floating height (i.e. the length of handle out of the water) can be seen from the next, lower diagram in the row. Shortening the handle is possible, and will not affect its ability to swim upright - but will give lower heights until it finally will sink.
You may want take out your spokeshave to shape the part of the wooden handle which is out of the water according to the sketch below. If you do so, you will increase beauty, usability and swimming height. How much swimming height will you gain by doing so? See the lowest diagram in the row.
Did I explain well enough?