Sunday, September 6, 2009

RE: [Electric Boats] electric drive for a pram tender

 

Thanks for your contribution to this thread.
What would be the weight of the batteries , and motor.
Regards Rob J.

--- On Mon, 7/9/09, Alycia & Kevin Miller-Lynch <ak@twcny.rr.com> wrote:

From: Alycia & Kevin Miller-Lynch <ak@twcny.rr.com>
Subject: RE: [Electric Boats] electric drive for a pram tender
To: electricboats@yahoogroups.com
Received: Monday, 7 September, 2009, 12:14 PM

For what it's worth, my 8 year-old 34lb MotorGuide pushes my #1400 Compac 16
at close to 4 knots.  For the first two seasons, I had a group 24 battery,
and I could safely run it for about 1.5 hours at max throttle (pulls about
32 amps).  Last season I added an additional battery, and I can push it for
over three hours.  I've been out in 20 ln + winds(albeit on a lake) and it
still has enough authority to move me around, although I probably lose a
knot.  It's pushing a lot more weight than your pram (but the weight and
keel probably help keep it from getting pushed around too much, but I also
have a lot more windage then a pram). Motor + 2 batteries + guest 8amp
charger + cables for less then $300.

Hopefully this helps.

From: electricboats@yahoogroups.com [mailto:electricboats@yahoogroups.com]
On Behalf Of Rob Johnson
Sent: Sunday, September 06, 2009 5:05 PM
To: electricboats@yahoogroups.com
Subject: Re: [Electric Boats] electric drive for a pram tender

 

Dennis , if I can go the most direct from boat to shore , waves aren't an
issue.
However , if I get blown out in to the harbour , they are.
Mostly , I wouldn't have a choice with the winds , if you have been out
sailing all day , you have to deal with the conditions as you find them , on
your return.
Even if it means just staying on the boat , till its manageable..
I'd love to be able to do an actual test , before I put my hard earned down
, on any motor.
Mercury have a 3.3 hp 2 stroke that weighs 13kg , if I needed extra grunt ,
that should do it.
Regards Rob J.

--- On Sun, 6/9/09, dennis wolfe <dwolfe@dropsheet.com
<mailto:dwolfe%40dropsheet.com> > wrote:

From: dennis wolfe <dwolfe@dropsheet.com <mailto:dwolfe%40dropsheet.com> >
Subject: Re: [Electric Boats] electric drive for a pram tender
To: electricboats@yahoogroups.com <mailto:electricboats%40yahoogroups.com>
Received: Sunday, 6 September, 2009, 11:54 PM

I'd be worried about taking a 6'6" pram out into 20 - 30kt wind with any
motor.  Wouldn't take much fetch to develop serious waves with than much
wind.

Torqeedo's website says a 2 hp gas outboard can exert about 40# static
thrust.

  ----- Original Message -----
  From: Rob Johnson
  To: electricboats@yahoogroups.com <mailto:electricboats%40yahoogroups.com>

  Sent: Saturday, September 05, 2009 10:30 PM
  Subject: Re: [Electric Boats] electric drive for a pram tender

    Dennis , I'm worried about the stronger winds , how would the electric
drive go pushing in to 20-30 knot winds ?.
  I would imagine it would need all of the push it could muster , but is the
prop , for example , appropriate ?.
  Regards Rob J.

  --- On Sun, 6/9/09, dennis wolfe <dwolfe@dropsheet.com
<mailto:dwolfe%40dropsheet.com> > wrote:

  From: dennis wolfe <dwolfe@dropsheet.com <mailto:dwolfe%40dropsheet.com> >
  Subject: Re: [Electric Boats] electric drive for a pram tender
  To: electricboats@yahoogroups.com <mailto:electricboats%40yahoogroups.com>

  Received: Sunday, 6 September, 2009, 12:15 PM

  Lets say 3 mph drawing 20 amps at 12v  and one gp 24 battery weighing
about as much as a medium size dog (56 lbs).  You could easily run for 2
hours, that's 6 miles or 12 round trips to your boat.

  The battery and 30 lb thrust trolling motor will be less than half the
cost of the smallest outboard engine.

    ----- Original Message -----
    From: Rob Johnson
    To: electricboats@yahoogroups.com
<mailto:electricboats%40yahoogroups.com> 
    Sent: Saturday, September 05, 2009 5:18 PM
    Subject: Re: [Electric Boats] electric drive for a pram tender

      .

   

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