Re: Electric Trolling Motors (was: Good Girl For Sale)
The trouble with "displacement" for comparison of boats is: what do they _mean_ by displacement. <sigh> Ideally, the displacement given by a boat manufacturer should be the weight of the boat with it's normal load --toggle quoted messageShow quoted text
the figure the designer used for calculation. Alas, what gets published as displacement can vary from the boat's weight when completely empty, to the weight when loaded to the max -- with no indication what. <sigh> But we have to work with what we can to get some _very_ rough idea about how different boats compare.
I think the crude spreadsheet I worked up a few years ago is useful, nonetheless.
Even though it doesn't take into account hull shape, which can have a big effect on wetted surface, which is the big part of resistance at low speeds. I've been noticing that Tuffy, because of her shapely hull and molded in keel, moves along under sail even in a barely perceptible breeze that would have left flat bottom, fin (technically) keeled Pearl dead in the water. But it would be hard to come up with a simple spreadsheet that included hull shape. <g>
You're right on the money about higher voltage having lower line losses, and lower losses from the Peukert effect.
On 8/9/2020 8:07 AM, johnacord wrote:
"My country, right or wrong," is a thing that no patriot would think of saying except in a desperate case. It is like saying, "My mother, drunk or sober." (Gilbert K. Chesterton)
This email has been checked for viruses by AVG.