Re: A Revolting Rescue Minor
- Thanks for the link, the SolidNav unit looks interesting. Rescue
Minor would indeed be a sweet ride for 25 minutes with this set up.
Quick figures: Atkin calls for a 25 HP gas motor. Figure you could
get equivalent performance with a 15 HP in electric or roughly 10
Kw. Four 4D 12 volt Lifeline AGM batteries weigh in at 540 lbs and
rated 122 amp hours to complete discharge over a one hour period so
we are pushing that measurement already as we will soon see. (Note
that they are called a 210 amp/hr battery but that is over a 20 hour
discharge period.) 48 volts times 122 amp/hrs equals 5856 available
watt/hours, divide by 10 Kw and you end up with .5856 hours which is
35 minutes to complete discharge. Now, you can't completely
discharge the batteries very often before cycle life is seriously
degraded so a more resonalbe figure would be about 25 minutes.
Unless you plan on only short runs, I would look for a more efficient
hull or go back in time and invest in Microsoft stock and take your
earings and get Lithium Ion batteries which currently weigh 7 times
less per amp/hr but cost ten times more than lead acid. Basically
planing with electric power is not very practical and especailly with
a tunnel hull. Still, it is all fun to consider. Best, Tom
--- In AtkinBoats@yahoogroups.com, "Bob & Lin" <tumates@...> wrote:
> I wonder how a 48V bank of AGM batteries comparable in weight to an
> Atkin era inboard (around 500 lb.) would perforn with this power:
> This could be a sweet ride.