Kevin on this little tender , weight is fairly critical.
A 2hp yamaha weighs 20 lbs , a 3.3 hp Mercury weighs 30lb .
That extra 75-85 lbs is critical , in this boat , I believe.
Regards Rob J.
--- On Mon, 7/9/09, Alycia & Kevin Miller-Lynch <ak@twcny.rr.
From: Alycia & Kevin Miller-Lynch <ak@twcny.rr.
Subject: RE: [Electric Boats] electric drive for a pram tender
To: electricboats@
Received: Monday, 7 September, 2009, 12:53 PM
The batteries are about 50# each, and the motor is maybe 15?
I keep the batteries in the center of the boat in the keel well. The nice
thing about a trolling motor is most of the weight is submerged, so it
doesn't' have much effect on trim. You can position the batteries wherever
the boat trim is the best. I use 4 Gauge battery cables from the autoshop,
but as you are in a marine environment, you'll probably want tin coated
cables. Use as large as gauge as your budget will allow, especially if
putting the battery in the front of the boat. The 10-12 gauge stuff on the
stock motor is a bit undersized for continuous running. I probably have a
couple hundred hours on the motor in the last 8 years with zero issues. I
think I paid $89 for it at wally world in 2000.
Kevin
From: electricboats@
On Behalf Of Rob Johnson
Sent: Sunday, September 06, 2009 10:25 PM
To: electricboats@
Subject: 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.
<mailto:ak%40twcny.
From: Alycia & Kevin Miller-Lynch <ak@twcny.rr.
<mailto:ak%40twcny.
Subject: RE: [Electric Boats] electric drive for a pram tender
To: electricboats@
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@
[mailto:electricboats@
<mailto:electricboa
On Behalf Of Rob Johnson
Sent: Sunday, September 06, 2009 5:05 PM
To: electricboats@
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.
<mailto:dwolfe%
<mailto:dwolfe%
From: dennis wolfe <dwolfe@dropsheet.
<mailto:dwolfe%
Subject: Re: [Electric Boats] electric drive for a pram tender
To: electricboats@
<mailto:electricboa
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@
<mailto:electricboa
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.
<mailto:dwolfe%
<mailto:dwolfe%
From: dennis wolfe <dwolfe@dropsheet.
<mailto:dwolfe%
Subject: Re: [Electric Boats] electric drive for a pram tender
To: electricboats@
<mailto:electricboa
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@
<mailto:electricboa
<mailto:electricboa
Sent: Saturday, September 05, 2009 5:18 PM
Subject: Re: [Electric Boats] electric drive for a pram tender
.
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