Rick Morel wrote in
:

I'm assuming your equation is Runtime in hours = Amphours / Thrust in
pounds squared?


My equations only showed the futility of using battery powered electric
drives compared to an outboard motor, nothing more. They were never meant
to be mathematically correct.

I was trying to point out the obvious and discourage him from this electric
nonsense when what he really needs is an old single cylinder 2-stroke and a
2 gallon gascan.


--
-----
Larry

If a man goes way out into the woods all alone and says something,
is it still wrong, even though no woman hears him?

On Mon, 29 Jun 2009 00:34:08 +0000, Larry wrote:

My equations only showed the futility of using battery powered electric
drives compared to an outboard motor, nothing more. They were never meant
to be mathematically correct.

I was trying to point out the obvious and discourage him from this electric
nonsense when what he really needs is an old single cylinder 2-stroke and a
2 gallon gascan.

It's not futile nor nonsense. I've used electric for my dinghies since
1999 with success and happiness. Total weight is little or no more
than an old 2-stroke and extra gas.

I have no objection to an outboard, but remember he's in a situation
where he has no place to store it except in the home or car. A smelly
and very dangerous thing to do.

Rick

On Mon, 29 Jun 2009 04:07:42 -0500, Rick Morel
wrote:

On Mon, 29 Jun 2009 00:34:08 +0000, Larry wrote:

My equations only showed the futility of using battery powered electric
drives compared to an outboard motor, nothing more. They were never meant
to be mathematically correct.

I was trying to point out the obvious and discourage him from this electric
nonsense when what he really needs is an old single cylinder 2-stroke and a
2 gallon gascan.

It's not futile nor nonsense. I've used electric for my dinghies since
1999 with success and happiness. Total weight is little or no more
than an old 2-stroke and extra gas.

I have no objection to an outboard, but remember he's in a situation
where he has no place to store it except in the home or car. A smelly
and very dangerous thing to do.

Rick

Old 2-stroke (3.5 HP) = 30 pounds
2 gallons pre-mixed gas/oil = 16 pounds
Total weight = 46 pounds
runtime = With 2 gallons of fuel? Bwahahahahaha!
recharge time = 1 minute
Additional runtime available in minutes at any fuel dock

Group 24 Deep cycle battery = 45 pounds
SMALL electric trolling motor (.25 HP) = 20 pounds
Total weight = 65 pounds
runtime = Do the math. 35 MAX usable amp hours, motor draws 35 amps at
full speed.
recharge time = 12 hours. Battery must be brought to shore and
attached to a charger for 12 hours before it can be used again.

So, 46 pounds gets you 3.5 HP for effectively unlimited runtime, and
65 pounds gets you .25 HP for 2 or 3 hours of runtime at MUCH slower
speeds before you need to go ashore for 12 hours.