Friday, March 6, 2015

[Electric Boats] Re: 1997 Duffy rebuild

 

I own an original Duffy the 20'  Edison model dates back to the early 70s.   Duffy didn't build them back then but Schock boats did so the hulls are narrower and longer typically.  I'll post a pic of the boat.  Its been repowered using a Torqeedo 2.0 cruise and we are very happy with it now.  It far more efficient than with the old DC powered system and so uses only 4 x 6v 220ah batteries from Costco.  We can cruise all day on this setup and I've gone from my harbor to one up the coast which is a 6 mile trip one way and 6 back so I know the boat has range.   We are on the 4 season with the Costco batteries and use a monitor system to keep tabs on the batteries.  I use a marine charger 24v multistage and it seems to be taking good care of the batteries.  I use a seperate 24v system for onboard systems with a step down 24v/12v converter.  I chose this to act as a backup motor battery hence the 24v but we've never needed it.  Obviously without the through hull propshaft the boat is quite different than most duffy's.  We can trailer it a bit easier since its more like an outboard boat now but still has a good keel which the trailer was designed for.  Overall we could not be happier with our older duffy it been very reliable with the Torqeedo system.

Steve
Duffy Edison 20
"Sparky"

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Thursday, March 5, 2015

[Electric Boats] new member's project: EP mountain lake cruiser on $2000 budget

 

Hi everybody,


  I'm new member Bill the sculptor...this is my e-boat project for our family of 7 who lives 1/2 mile from a beautiful clear mountain lake in central WV.  we don't need to water ski but want to go fishing and swimming and hiking in uplake  areas, the lake is a dammed up river that goes back 17 miles and has hundred of miles of shoreline.

I've budgeted $2000,  the project begins:


I bought a 70's vintage 21ft sailboat hull on a trailer for $285.  hauled up to the mountains from the maryland atlantic shore


RK 21 Centerboard Overnighter Cruising Sloop



and I bought one hell of a motor  for  $330.


48 VDC 4000 RPM 8 HP Electric Motor Etek Bolt Pattern 3/4" Shaft New 48V NOS


add one brass 18"/17 pitch  boat prop    $35   


brass boat propeller



The various various connectors and gear boxes, shafts, bearing needed will cost $100 more 



So I spent $750, and I have $1250 to go,  Now, dear new friends, is when this poor newbe needs your help and advice with the electric system.


I will for go purchasing  expensive batteries for now, I have some deep cycle marine lead acids, 3 good ones that will get me 36V,  I may double up on that for an additional $150 -200


that leaves me with $1,000. left to play with for solar panels, a charge controller, a motor controller....can it be done?

  

I want your suggestions for a good charge controller/solar panel combo   I have this dream of a switch I throw that drives the motor directly from what sun is shining on say 3-300watt panels,  that is, a direct connection from panels to motor.....is that practical? possible?  electrically kosher?


I am a sculptor/mechanical fabricating wiz/welder machinist....but I know very little about DC power and solid state electronics.  I have by formula computed the theoretical hull speed to be 5.75 knotts, so I am going for 80-85% of that, say a 5mph cruise rate,  The de-masted and stripped hull will weigh in at 1200, after the 600lb ballast is replaced by batteries, motor and 3 solar panels.  I' ve heard it said that  about one HP per 500 lbs of displacement will drive you close to 85% of theoretical hull speed, so  thats would mean I need 3HP, say 2000 watts with battery assisting solar panels to attain full cruising 5mph.   but I would like to also just lol along on straight sun power at times using the motor at way under capacity (this motor will delivery great torque at low speed, running at 12 volts or less).   The huge over sized prop won't "slip" much, and will be geared down, turning slow, at 200 rpm  to  max 1000 rpm.


A pleasure to join your group.  http//www.billhopen.com






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Posted by: billhopen@yahoo.com
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Re: [Electric Boats] Re: Lyman 13 Torqeedo Cruise 2.0 power consumption

 

Someone mentioned that there are already EXISTING after market high thrust props available for standard trolling motors??  (Like Minn Kota)

If so, could someone post a link.  I'd really like to find something similar to a Torqeedo prop for a Minn Kota (and at much more reasonable cost would be really nice too!).

Thanks,
John

From: "'Glenn Holland' gholland1@nc.rr.com [electricboats]" <electricboats@yahoogroups.com>
To: electricboats@yahoogroups.com
Sent: Thursday, March 5, 2015 8:01 AM
Subject: Re: [Electric Boats] Re: Lyman 13 Torqeedo Cruise 2.0 power consumption [2 Attachments]

 
[Attachment(s) from Glenn Holland included below]

Yesturday I tested for the first time a marriage of a Toq. prop to a MG hub.  It was quite windy so I couldn't do any precise testing but it was definately more effecient than either a Kip. or the standard MG prop. Hull speed at lower throttle.   A couple of photo attached.
Glenn Holland
 


----- Original Message -----
Sent: Thursday, February 26, 2015 12:51 PM
Subject: Re: [Electric Boats] Re: Lyman 13 Torqeedo Cruise 2.0 power consumption

 
Before finding this site,  I did purchase a Kipawa prop but since it is still winter here haven't tried it yet. I was also thinking of making a fairing for the shaft as well.

After doing some research here, I was also thinking of trying the Torqeedo prop on the trolling motor.

Most of the nearby lakes around me are electric only state parks and, from what I have witnessed, have not been exposed to a real electric powered boat of any significance to test the 'electric only' rule.  My goal with this setup is just a nice no-wake cruising speed with some reserve power if needed.  With two small children getting used to boating, this is about my limit at the time. 



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Re: [Electric Boats] Re: Lyman 13 Torqeedo Cruise 2.0 power consumption [2 Attachments]

 
[Attachment(s) from Glenn Holland included below]



Yesturday I tested for the first time a marriage of a Toq. prop to a MG hub.  It was quite windy so I couldn't do any precise testing but it was definately more effecient than either a Kip. or the standard MG prop. Hull speed at lower throttle.   A couple of photo attached.
Glenn Holland
 
----- Original Message -----
Sent: Thursday, February 26, 2015 12:51 PM
Subject: Re: [Electric Boats] Re: Lyman 13 Torqeedo Cruise 2.0 power consumption

 

Before finding this site,  I did purchase a Kipawa prop but since it is still winter here haven't tried it yet. I was also thinking of making a fairing for the shaft as well.


After doing some research here, I was also thinking of trying the Torqeedo prop on the trolling motor.


Most of the nearby lakes around me are electric only state parks and, from what I have witnessed, have not been exposed to a real electric powered boat of any significance to test the 'electric only' rule.  My goal with this setup is just a nice no-wake cruising speed with some reserve power if needed.  With two small children getting used to boating, this is about my limit at the time. 


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Attachment(s) from Glenn Holland | View attachments on the web

2 of 2 Photo(s)

Posted by: "Glenn Holland" <gholland1@nc.rr.com>
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Wednesday, March 4, 2015

[Electric Boats] New Member introduction

 

Hi every body,


I'm just starting my electric boat project.   There is a beautiful mountain lake 1/2mile from my house in WV.


Though I canoe a kayak, its hard to get out with our 5 kids (littlest one 3yrs old)   so we decided we need a lake cruiser.   I just bought a 70's vintage 21ft FG sloop off the atlantic coast and will be bringing it to the shop.  It will be refitted from sail to an electric slow boat, sort of like the African Queen.   A sun shade roof of solar panels and and electric drive, ballast replaced with a bank of batteries.


My theoretical hull speed is about 5.73knots, stripped weight displacement will be 1200 lbs,  so I figure a large slow turning prop engineered to push us at 5mph would take 2-3 hp motor and draw 1500-2000watts to cruise


I'm hoping to get good advice from you all who have gone electric before me.  the mysteries of motor controllers, solar controllers, battery banks, and DC motor effeciencies will be what I need help with.


I am a bronze figurative sculptor by trade, so welding, fabricating, rigging will be no problem...I'd be glad to help advise any of your with custom cast fabrications you might need in stainless or bronze.


www.billhopen.com

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Re: Fwd: [Electric Boats] Charging batteries in series?

 

first, my admiration to you for your electricboat...wow what a beauty.   I'm just getting started on my local lake cruiser...the refitting of a 21ft sloop, changing it from sail to electric prop.   All I want is about 4-5 knots, my theroetical hull speed is 5.73 knot, and I've heard 80% of that speed is an energy efficient target .


I like your idea of putting lightweight flexible panels up to keep over head weight down.   I would like to hear your suggestion for what sort of solar charge controller you would use for about 6 grape panels such as you have.   I'll be running a small 2hp 36v motor turning a large prop rather slowly(by gearing it down)

Of course I will have a battery bank, but I wonder if I could just cruise directly from what sun is hitting the panels.

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[Electric Boats] Re: 47' Catamaran Project

 

Thanks for the info.


I am 58, in good shape and a friend is cutting the bulkheads out with his CNC.  I should have them around the end of May.  I have summers off and most of the equipment I need.  This is my retirement house!  I look forward to hearing how your project finishes out.

Bob

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