Eric, that performance data is based on my visual estimates compared to walking speeds, not measurements.
--- In electricboats@yahoogroups.com, "Eric" <ewdysar@...> wrote:
>
> Hi Alex,
>
> I'm sorry that you have to let your project go, it was obviously turning out well.
>
> I read your files and was wondering if you ever had the chance to objectively measure your "watts to knots" performance. I saw the spreadsheet of your performance calculations along with you observations that "6 mph.... feels very fast on the water in a quiet setting." and "Cruising 4 mph.... is delightful."
>
> I found that my boat's performance after conversion met my expectations by my "seat of the pants" measurements. But when I actually measured the amps drawn from the batteries at measured speeds (multiple 2 pass runs in opposite directions over a 400-500 yard course) I found that at low speeds, my watts to knots performance was significantly different than my predictions and that overall, the efficiency was better than I expected. This allowed me to completely change my speed/range predictions and I found that more of my local area is within range of my battery pack alone.
>
> As we are able to collect more objective performance data on this list, we can set more realistic expectations for those who might be considering a simliar conversion.
>
> Anyway, I hope that you get another chance to rejoin the elctric boat community.
>
> Fair winds and smooth sailing....
> Eric
> Marina del Rey, CA
>
> --- In electricboats@yahoogroups.com, "alex" <alex04032@> wrote:
> >
> > Here is my project boat, "Watt's Happening", completed last summer in Freeport, ME, and had a good season cruising on Casco Bay. However, Im converting my home there to a rental and everything has to go. New Years Eve 2012 is coming up too, so a resolution to simplify fits well with this plan.
> >
> > Descriptive Files are in the group folder "Watt's Happening". We dont do business here, so its basically free to a good home... to someone who wants to debug some minor items and continue electric boating.
> >
> > It's on a crappy trailer that should be o.k. for daytime towing in New England... IMHO.
> >
> > The six Trojan batteries have very few low-discharge cycles and are basically like new. If you want just the boat or motors/controls, I can sell the batteries locally. However, I'm not giving the batteries away w/o the boat.
> >
>
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