Open electric displacement boat 16-18'

[SJKaplan]

Nobody has mentioned Phil Bolger's Lily. Not a Nordic lapstrake hull but he did work out the power requirements and specs using OTC components.[IMG][/IMG]

In addition to POrt Pegasus, I have also been seriously considering Lily. Indeed, I received the plans last week. Thank you for posting the images. Do you have any more? or any comments about the boat?

Bolger's electronic plan was devised in 1995 and I think things have progressed. Indeed, a torqeedo travel 1003 could probably be all that one needs, possibly with a spare battery.

[Kaa]

Just got this months Watercraft.

Free plans from Paul Gartside for a 20ft double ended steam launch.

A steam canoe, to be exact :-)

Kaa

[James McMullen]

Bolger's Lily is so very, very, very far from a lovely Nordic lapstrake hull though.

With the wealth of instructions, plans and even kits for glued lapstrake these days, there's really no need to settle for a hard-chined flat-bottom simulacrum of a boat. It would even cost you the same amount of dollars and take the same size stack of quality marine plywood.

[mcdenny]

Just 'cause it's electric and everyone thinks they have to be slow:

http://www.youtube.com/watch?v=txEp3...=youtu.be&hd=1

This is with a heavy old piece of crap 1970s fiberglass boat. Think of the performance if it was a modern light weight wood runabout...

[John Hunter]

Oddly enough, I too was looking at making and electric Happy Clam and sent an email off the Elco, a manufacturer of electric boat motors for their opinion. I copy it here (with their permission)


"Looking at the Happy Clam our EP-600 would be fine. The boat is light enough so we could program our motor to run at 24 VDC instead of 36 VDC. The motor is a brushless AC motor and has a controller/inverter built into the motor box. We suggest using AGM batteries. You directly couple to the prop shaft eliminating a transmission. The unit weighs 170 lbs and has a one inch shaft. Please see our web site for motor specs, components that come with the system and a line drawing: www.elcomotoryachts.com"

"The cost without batteries, charger or shipping is $6,599.
Remember these systems are designed to drive the boats to hull speed, in your case 5 knots or so, not to get the boat up to planning speed. The EP-600 will power a boat in the 20’ to 24’ length and a displacement of up to 3,500 lbs. This is a brushless AC motor with a inverter built into the controller. For boats, 1,000 lbs or less, we can run it at 24 VDC. If over 1,000 lbs then we program the motor to run at 36 VDC."

[mcdenny]

Electric Yacht http://www.electricyacht.com/products/quietorque/ has an inboard unit 50% more powerful than the elco for $4400.

AMeP http://www.advancedmarineelectricpro...es/Page497.htm has one for $3500

Thunderstruck http://www.thunderstruck-ev.com/sevc...kit-8.5kw.html has a kit for $1700 but you need to do a good bit of fabrication to build it into a boat.

Kind of apples to oranges but a Torqeedo 4.0 outboard is 1/4 the weight, 1/2 the price and 1/3 more powerful. About 1/100 the installation hassle too.

None of these prices include batteries or a charger.

[Colin Lee]

Hiya Sailers, I've been thinkin on this problem for an aux to be used in conjunction with a sail on a 10m Dory type boat, similar to a Benfod hull. 3 Batteries in a trough on the mid lie as extra ballast. A contractors air cooled generator which can run at low revs to charge and a Glen L style electric outboard using an o/b leg powered by a 12v electric motor. Charging before you leave, on the go (not prefered) or as nessasary. It would be used for camping/ cruising for a week or two at a time. Whaddya reckon. Colin

[Kaa]

Whaddya reckon. Colin

As usual, it all depends. Will you use your electric outboard to motor across the lake in dead calm? Sure, it'll work. Will you use it to fight wind and tide in a choppy sea for many miles? Um, you'll have a problem.

If you'll be carrying gas anyway (for the generator) why do you want electric and not a plain-vanilla outboard?

Kaa

[Daniel Noyes]

I've seen Lilly in person, under a tarp in Phil Bolgers side yard. interesting small craft, ideal for our local estuaries.

[Colin Lee]

I know it appears absurd, I would only want to use the out board to get off a mooring and to assist with sail. The quietness is what attracts. Other issue is that a small gen runs at a low rpm therefore low gas use. Also I'd just like to experiment. Colin

[Kaa]

I know it appears absurd, I would only want to use the out board to get off a mooring and to assist with sail. The quietness is what attracts. Other issue is that a small gen runs at a low rpm therefore low gas use. Also I'd just like to experiment. Colin

Well, to get you off the mooring and to experiment just get yourself a trolling motor. They're cheap, don't need much in the way of installation, and can certainly get you in and out of a harbor. What's the displacement of your boat?

Kaa

[eastern270]

I cold molded a Poulsbo boat 17' a few years ago. It's a displacement Hull and I think it would suit electric power very nicely. I have it way over powered with a 14hp beta diesel. Chugs along very nicely and comfortably. Its also extremely fuel efficient. Pics on forum somewhere but could repost more if needed. Actually a recent video in designs section (I think) forum.

[Full Tilt]

Just 'cause it's electric and everyone thinks they have to be slow:

http://www.youtube.com/watch?v=txEp3...=youtu.be&hd=1

This is with a heavy old piece of crap 1970s fiberglass boat. Think of the performance if it was a modern light weight wood runabout...

Ya, you could probably waterski for a full 45 minutes a day! Electrics aren't there yet, at least when it comes to ski boats. Rapid charging rapidly destroys your batteries.
Want speed thrills on water? Buy a kiteboard. Waterskiing is not a constitutional right.
Mike

[Breakaway]

Ya, you could probably waterski for a full 45 minutes a day!

Actually, this one will run for several hours towing skiiers before needing recharge ( recharge time 4 hours they say)
http://www.boatingmag.com/blogs/boat...ic-motor-boats

Kevin

ETA Scroll down to the video

[Full Tilt]

Actually, this one will run for several hours towing skiiers before needing recharge ( recharge time 4 hours they say)
http://www.boatingmag.com/blogs/boat...ic-motor-boats

Kevin

ETA Scroll down to the video

And if you believe that, I've got some lovely Florida real estate to show you!
The article states the boat is capable of several ski runs (that means 3, 15 minute tows) over several hours (45 minutes total per day). Not unlimited skiing for several hours. A four hour charge, twice a day would destroy $10,000 dollars worth of batteries in a season. Fast chargers cannot fully charge a battery bank (usually 80%) and produce a lot of cell destroying heat.
I saw a pair of mahogany decked, fibreglass hulled, retro runabouts at last years boat show. One was gas, the other, electric. The price difference was 60,000 dollars! And that was for a single motor! Their competition ski boat drive coupled a pair of motors to one prop, and was still in the prototype stage.
Only millionaires on private lakes with 'no motorboats' laws can afford something like that. Electric ski boats are 'virtual fantasies'.
I wish it weren't so, but that's where we're at.
I was a professional waterskier for three years in the late sixties and early seventies, when I was young and naive. Since then I learned how to sail and then windsurf. I got all the adrenalin rush I needed wind surfing and if kiteboarding was around then I would have been into that too. Where is it written that a sport invented at a time when the world knew nothing about pollution or peak oil, must endure into an era where human beings are killing each other over energy reserves? Toronto used to have giant festivals on the waterfront, where Tall ships were loaded with fireworks and combustibles and set ablaze. Fortunately we grew out of that.
Mike

[Thad]

This launch had a 6hp make and break in it, 18' long, I replaced that with an electric drive, joystick control. Worked well. The only picture I have of it underway.

[mcdenny]

Thad,

Beautiful boat and a perfect choice for electric power. The silence must really be golden comapared to that noisy putt-putt.

[openboater]

While not as pretty as Thad's boat above, or Denny's 25' launch, this works pretty good for us. 19'9" loa, 5' beam, 36 volt, 6 grp 31 12 volt batteries . 5.9 mph top end and 5.1 mph at 21 amps for hours.
36 volt minnkota, kipawa prop, minnkota EM controller.
1/4 inch meranti sides (2 10 footers with payson joint to make 20', and 5/8 meranti bottom. 20' construction grade 2x4's ripped to 2x2 for chine logs and gunnels) chines armored with 3 in glass tape and epoxy. Styx primer and benjamin Moore Mor-glo latex paint only to protect plywood)

[Breakaway]

Only millionaires on private lakes with 'no motorboats' laws can afford something like that.

Yeah. But if I was that guy, I could see myself enjoying a coupla three runs before work, plug it in, then do a couple more runs after dinner. Isn't that how most ski boats are used anyway?

Kevin

[bloggs68]

How about this one?

David Payne design, 17', plenty of room for 4, stable, lots of room for batteries and pretty sweet looking.









Can build her traditional clinker, clinker ply. This one has a twin cylinder 2 stroke petrol (vintage) but electric would be perfect - maybe a mastervolt 3.5kw 48V AC?

regards,

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