Re: Another Bolger lapstrake, Nord Coaster, 16 foot Cat Yawl
A friend and I did an experiment with a couple of super quick and dirty Bolger Teal's many years ago. Sam built his exactly according to spec, clamp-on leeboard and all. Because I had been a little dis-satisfied with the performance of the leeboard on the Chamberlain dory-skiff I had built, I made a daggerboard case on the other one and jammed the stock leeboard in it as a daggerboard. The difference was unequivocal, even for a couple of young, brash, not particularly skilled sailors. Both Sam's Teal and the dory-skiff got daggerboards too, immediately after, and I've never bothered with a leeboard since.
The explanation I've heard is that the surface-piercing foil of a leeboard is much more prone to developing unfavorable spanwise turbulence than an end-stopped fully submerged foil like a CB or DB.
The most interesting thing to me about the Nord Koster design is that I am using essentially the same size rig in a boat that weighs less than half as much in Rowan. Different strokes for different folks, of course. But I will note that the double-ended lapstrake lug yawl Rowan, with her fully submerged CNC machined NACA section foils, is indeed renowned for her windward ability, esp in choppy conditions.
Amphibious Macroplankton Oughtredia doublendus
Mostly found frequenting the littoral and estuarine zones in the southern half of the Salish Sea, though sightings have been recorded both north and south of this area, and occasionally, but rarely, inland, in freshwater environments. This species lives on micro-brewed beer and dutch-oven biscuits,and displays brightly colored nylon and gore-tex plumage during the rainy season. Approach with caution!