Ok, so at 50 amps * 24V, I'd be in the ball park for a 2300# Catalina 22.
From a youtube review of the Traxxis MinnKota 80# motor, they report:
slow 5A 20hr
med 28A 3.6hr
top speed 56A 1.8hr
The above assumes a 24V, 100AH battery.
If I could get ~5mph out of a $600 motor for an hour, I'd be THRILLED!!
From: Eric <ewdysar@yahoo.com>
To: electricboats@yahoogroups.com
Sent: Wednesday, May 29, 2013 5:00 PM
Subject: Re: [Electric Boats] Trolling motors ==> electric outboards
Hmmm. If there was only some way that one could easily estimate how much electric drive would be needed to move their boat at 90-95% of displacement hull speed....
Oh yeah, back when we used to discuss boat conversions, the rule of thumb of 1kW of power for each ton of displacement has proven to be correct for boats ranging from 18 feet past 40 feet.
Of course, one can move the boat with much less power (search this list for "Jack LaLanne" for low power examples), but for safe operations in all but the most extreme cases, this "rule" works surprisingly well.
Fair winds,
Eric
Marina del Rey, CA
--- In electricboats@yahoogroups.com, John Francis <surv69@...> wrote:
>
> In my opinion, anyone thinking electric should stop worrying about
> comparisons to IC engine horsepower.
>
> As I see it, for the most part the comparison is ... well ... horsepoo.
>
> The 10HP motor you use is not a ten HP motor, cause generally speaking,
> most sailors don't use a 10HP motor to generate 10 HP.
>
> I kinda wonder if the only sailors, who've ever utilized 10HP from a 10HP
> motor, only did it to see "how fast", the engine could go, then they rev
> down.
>
> Key ingredients for a motor on a sailboat is to provide steerage and some
> minimal degree of propulsion... not much more.
>
> Of course it always helps to have a few hundred HP's and bowthrusters, if
> that's what you feel you need.
>
>
Oh yeah, back when we used to discuss boat conversions, the rule of thumb of 1kW of power for each ton of displacement has proven to be correct for boats ranging from 18 feet past 40 feet.
Of course, one can move the boat with much less power (search this list for "Jack LaLanne" for low power examples), but for safe operations in all but the most extreme cases, this "rule" works surprisingly well.
Fair winds,
Eric
Marina del Rey, CA
--- In electricboats@yahoogroups.com, John Francis <surv69@...> wrote:
>
> In my opinion, anyone thinking electric should stop worrying about
> comparisons to IC engine horsepower.
>
> As I see it, for the most part the comparison is ... well ... horsepoo.
>
> The 10HP motor you use is not a ten HP motor, cause generally speaking,
> most sailors don't use a 10HP motor to generate 10 HP.
>
> I kinda wonder if the only sailors, who've ever utilized 10HP from a 10HP
> motor, only did it to see "how fast", the engine could go, then they rev
> down.
>
> Key ingredients for a motor on a sailboat is to provide steerage and some
> minimal degree of propulsion... not much more.
>
> Of course it always helps to have a few hundred HP's and bowthrusters, if
> that's what you feel you need.
>
>
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