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Just reviewing comments beginning to end. MK's EM
series are intriguing. Hopefully you can give us an
update as to how they perform a year later?? The EP
series (designed for main propulsion of pontoon boats,
although I don't understand how that differs from other
"day in day out" use) is also interesting, but the
MKota catalog doesn't detail the inherent differences.
And finally, does anyone have experience with prop
selection in the off-the-shelf electric outboards??

The leisure style boats are cool. I personnally
like their style and was contemplating getting one,
but the cost for one is more than I personally would
pay for one, except for their bass boats. But
overall, I feel this is type of boat that would benefit
from the use of the electric motor that you are
wanting to use on it.<br>The boat has a very stable
platform and the seating is very comfotable, perfect
fishing, leisure style boat. The only thing I see that
would ber a problem would be the transom mount as thier
is none on this boat, although someone could
manufature something or another to mount on the boat.Good
luck let us know what you find or do.

Does the motorplate mention the ampere draw?
Multipy this by 36 to get kW (and hence horsepower).
<br><br>15 mph in a john boat. That means it will have to
plane. The problem with electrics and planing boats is
getting enough power while keeping weight down. Planing
boats go from plowing through the water to planing over
the top, they never glide (which of course is
economical). <br><br>I'm not going to say a 15 mph chase boat
using a 12' john boat is out of the question, but I'd
make sure I could return all those batteries if it
doesn't work out!

Hi,<br>I am new to this list, but am part of
another list that is somewhat related, the EV discussion
list. I have just finished converting a honda civic to
electric power, and am thinking of doing a boat next. I am
in a rowing club that rows on the petaluma river in
CA and is in need of a boat. The boat would be used
by our instructor (and by me to muck around in :) to
instruct us as we row. I already have a small boat that I
would like to use, although I am not sure it will work
as it probably doesn't glide through the water as
well as might be necessary. The boat is an 11.5 foot
long gamefisher. It is a flat front aluminum boat with
a 5 horse max rating. This boat would need to be
able to go at least 15 mph for about 45 minutes. Is
this a reasonable expectation? I would like to just
convert a gas outboard, but I could go with a more
efficient drive system if needed. I also have a "mystery
motor" that I would like to use. I don't know what it
is, but it is rated for 36 volts, 4500 rpm, is about
5 inches in diameter and about 10 inches long with
some pretty heavy duty brushes. <br>Any feedback would
be greatly appriciated.<br>Thanks,<br>Thomas

I think I found what I am looking for in a small
electric fishing boat. You can see it
at:<br><br><a href= target=new></a><br><br>I am not interested in the rails, motor, or chairs
and consoles, but I like the design of the hull. I am
trying to see if I cna purchase just a hull and maybe
the top deck. If not, I will probably just make a
mold similar to this design...<br><br>What do you guys
think....?

For an interesting article about early
semidisplacement hull design, much of which can be apppied to
electric boats, check out this article from the "Rudder"
magazine. <a href= target=new></a>

When considering a hull for electric, keep in
mind that early power boat designers faced the same
problems that EB designers face now--low power and high
weight. The Handy Billy is based on a William Hand design
from 1912 and would indeed make a nice electric
boat--other designs to look at are the boats from William and
John Atkin, the plans for which were published in
MotorBoating Magazine during the 1930-50s, maybe even earlier.
Just because a design is old, don't dismiss it for
being outdated and irrelevent--I'll take the practical
experience and common sense of those early designers over a
computer program anyday.

The current WoodenBoat magazine cover story is
about the 21' Handy Billy. It is a semi-displacement
hull, a very efficient form. Semi displacements have a
higher operating speed range than displacements and are
still energy efficient. They don't have the 'power
hump' associated with planing boats. Semi's will slowly
come up to skimming, and if enough power, planing.
This one looks like a good hull shape for someone
interested in a medium size, moderately fast electric.
Although it would move along nicely with 2Hp, the Lynch
motor would really make it scoot around. The hull is
shown planked, but the form would be easy to make in
stich 'n glue plywood. Take a look!

Yes Jim builds efficient and beautiful boats and hangs out like JulieAndrews on her HighonaHill meadow, he's in Colorado: JThayer, Rt1 Box 75, Collbran, CO 81624

Marvin, I took a look at patent 6,138,602.
Interesting shape, the forward half reminds me of a Boston
Whaler or cathedral hull. The after portion is very
interesting it is a negative deadrise! An upside down vee
hull. This boat is a planing boat, probably not what
he's looking for.

Jim Thayer Who is alergic to email makes 2
diferent Glass fiber Hulls, The 16' Victoria Hull pictured
in steam trim here <a href= target=new></a>
is as I recall is about $1200 the much larger 19'
Mountain Gal Hull is about $3600. If people are interested
I will dig up his snail mail address.<br><br>Matt

Hey mmotsenbocker,<br><br>What you propose sounds
interesting. I do have some knowledge of desiging efficient
hulls, but no where near the level of the person that
you describe. I am not quite sure how well ship
design would scale down to a little 17' fishing
boat.<br><br>I just want a stable fishing boat that will run
about 10mph for say 30-50 miles... <br><br>Making a
mold is not all that hard or expensive, but it is
extreamly time consuming and messy ( lots of sanding and
polishing ) Simple shapes with gentel curves tend to make
the most efficient designs.

Hey webcrawler:<br>If you have the wherewithall
to mold any shape you need, there are some very good
designs out there (see U.S. Patent NO. 6,138,602 for
example). If you are thinking about putting an outboard in
the middle, why not let an accomplished former navy
boat designer who has pushed the envelope already
design a fast, more efficient boat for free? Eugene
Clements has the knowledge and is willing to (or was, the
last time I talked to him) help you. Eugene was
looking for someone like you and had contacted people in
the solar splash competitions who also need his help.
Let me know if you would like to pursue this. Marvin

That is what I have found....<br><br>I can get a
stable ( inefficient boat ) or a Efficient boat that is
not very stable.<br><br>I am seriously thinking about
making a mold for my boat. ( My dad is a 38 year retired
composists specialist from Lockheed )<br><br>What do you
guys think about dimentions. I was thinking about 17'
with about a 90" beam. Each side of the catamaran
design would be approx 2' to 3' wide to provide
stability.<br><br>Best way to think about the design would be two 17'
Canoes with a platform between the two and the outboard
in the center. I would of course adjust the shape of
the hulls as nesessary. I would not make the hulls
symetrical to reduce the bow wave collision in the center of
the boat which would cause significant drag. I guess
it would look more like a tunnel hull with a
rectuangler tunnel down the middle.<br><br>I have never seen
a large bass boat made this way before, but it
should be fairly stable and offer much better
efficiency...I do see a lot of small 8'-10' two man crafts made
this way....They are basically two pontoons with two
chairs connecting them together. Not exactly what I am
going for...<br><br>Any thoughts or comments will be
most welcome...

After posting # 907, I read all of the previous
postings and found most of my answers. I'll cogitate on
the good information already available rather than
troubling people to repeat it, but I may come back to you
if I'm still stumped!

I'm thinking about converting an old 14' cedar
lapstrake keeled dory to electric. It already has an
inboard gas engine (11hp) swinging a 12' prop (I don't
know the pitch). That's more power than it needs, I
think. I wrote to EVAA, and they estimated I needed a
2HP motor to push this at 5 knots, assuming it weighs
about 1000 lb fully loaded. I then spoke with Budsin
boats, who make a fiberglass boat similar to mine and
power it with a 1/2 to 3/4 hp motor. Before I buy a
motor, any thoughts about whether I can get by with a
motor smaller than 2HP?<br><br>Second question is
whether people doing this type of conversion typically
use one of the new solid state controllers, or an old
Curtis controller. I don't really need infinite speed
variation -- 2 or 3 speeds would be fine. On the other
hand, I'm concerned that the old-type controllers could
get hot -- not a good idea in a cedar
boat!<br><br>Any advice would be appreciated.

You don't have terrific choices. The best hull is
a displacement boat designed for power, but these
aren't made much anymore.<br><br>Jon Boats and other
powerboats are a poor choice because they are planing boats.
(Chopping off the stern adds about 30% drag to a boat.)
<br><br>Sailboats make poor cruising boats because sailboats are
designed to have poor initial stability, and high ultimate
stability. You will find them 'tippy' when the beam is
level.

Webcrawler,<br> There are alumin flat bottom
boats I can't remember if it was made by sea ark or by
nova, or if it was some other company. They were
designed if I remember for jet boat motors. <br> There are
numerous options available. I used to have a sailboat that
i converted into a fishing boat using an electic
trolling motor. It was pretty nifty as it almost planned
on the water, and it was fairly light weight. Two
people could pick it up easily and load it into the back
of my pickup truck.<br> Go to a local boat show and
you'll see countless designs that will probably fit your
budget, in the type of boat you want. Good Luck in your
quest for your boat.

I am still trying to figure out what I want to
try my new electric motor on. Do any of you guys have
any ideas of a small boat to try it on???<br><br>I
really do not want a John boat, I was thinking about a
small glass boat that I could do some modifications to
the transom to improve low speed efficiency. I guess
I could modify a john boat, but the metal work
would probably be extensive.<br><br>I saw a pic of an
old Tunnel Hull HydroSport that looked interesting.
Have any of you guys ever seen one?<br><br>I still
think a catamaran type of boat about 16'-17' would be
ideal. Do you guys think an old sail boat could be
converted into a bass fishing platform???<br><br>Any other
ideas????

Welcome Dave. I think you will have much to contribute to the club. There are a number of members who are involved in conversions of larger boats. No doubt you will hear from them.<br>Paul