Saturday, March 23, 2019

Re: [Electric Boats] Re: Conversion

 

I converted a dual screw 41 foot Chris-Craft.  See info here: http://www.deny.org it does indeed turn on a dime. Not that I don't still bump the docks every so often. 

I used Electric yachts motors, I probably have a thousand nautical miles on them of which over five hundred of those miles were put on this last year.  

The rest of the system I designed and built myself.  My first recommendation is to figure out what size and voltage battery you are thinking about, then the other components will be easer to recommend. 

If you are planning on a high voltage battery pack, your choices for motors and chargers are total different from 48 volt low voltage systems.  

You basically have three options now a days:
1, Low voltage battery 48 volts, with a Montenery style 48 volt motors. 
2, High voltage battery 96-300 volts with automotive style motors like a salvage Tesla motor. 
3, Or A Low voltage battery 48 volt with large inverter(s) and VFD driven AC motor.

Each has advantages and disadvantages.  

On Mar 23, 2019, at 1:56 PM, kd5crs@gmail.com [electricboats] <electricboats@yahoogroups.com> wrote:

 

If you haven't already, look at eTolly. They've fully converted a Tollycraft 30 with excellent results, so you should be able to just do what they did. The YT channel is https://www.youtube.com/channel/UCRq6B3I5iQdaU_ePXfMD9xA.

Good luck,
Brian

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[Electric Boats] Re: Conversion

 

If you haven't already, look at eTolly. They've fully converted a Tollycraft 30 with excellent results, so you should be able to just do what they did. The YT channel is https://www.youtube.com/channel/UCRq6B3I5iQdaU_ePXfMD9xA.

Good luck,
Brian

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Posted by: kd5crs@gmail.com
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Re: [Electric Boats] Conversion

 

Dennis,

I can't say for sure, but I doubt you could find large enough BLDC motors for that application.  If you contact D&D Motors, https://www.ddmotorsystems.com/  They have shunt-wound motors for the marine industry.  They supply for Duffy boats.  I think their "normal" largest is the 16.4 H.P and a max capability (on land) of 25Kw.  They use Curtis Contrillers, but there are several others like Sevcon and Kelly that may work too.

The design and installation is not dificult if you can do a bit of fabricating and see the job from start to finish.

Good luck and Press on,
Dan H.

----- Original Message -----
From: dennislarson802@yahoo.com [electricboats] <electricboats@yahoogroups.com>
To: electricboats@yahoogroups.com
Sent: Fri, 22 Mar 2019 21:54:18 -0400 (EDT)
Subject: [Electric Boats] Conversion





 

A Tollycraft 26, weighing 9,000#, with two screws. My wife and I are going to live aboard in Santa Barbara, so we are not planning to get up on plane, or cruise very far, and we're happy with 6 knots. I'll get a generator if we ever want to go further than the Channel Islands. Kits seen a bit pricey, and I'm pretty handy, so I'd like to do the work.


Any suggestions would be greatly appreciated. I'm excited about having two electric screws. I'm imagining spinning around in the middle of the Harbor, quietly! I'm trying to find components that are good quality, at a reasonable cost.


Thank you very much!





--
Dan Hennis
CTR Services
P.O. Box 254
14237 FR 1155
Cassville, MO  65625-0254
417-396-0228

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Posted by: DAN HENNIS <dhennis@centurytel.net>
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Re: [Electric Boats] Re:Prop pitch for regeneration

 

Pelton Wheel Micro Hydro Generator


-----Original Message-----
From: John Acord jcacord@gmail.com [electricboats] <electricboats@yahoogroups.com>
To: electricboats <electricboats@yahoogroups.com>
Sent: Sat, Mar 23, 2019 12:13 pm
Subject: [Electric Boats] Re:Prop pitch for regeneration

 
Two good thoughts. 

Clearly using combined propulsion/regeneration is an inefficient compromise, and that it is important to consider the loss to drag.  I think the loss to drag is in many cases acceptable if the system efficiency gives the desired gain, and if having two separate systems is acceptable.  Redundancy is good in any case.

Michael, thanks for noting Watt&Sea.  I was not aware of how much work has been put into this by both the racers as well as cruisers.  Lots of good information there and elsewhere, especially looking at the props those type of systems use.

Seems like a starting point would be to start with a simple trolling motor and aftermarket prop and see what you get and how much it slows the boat down.  If that looks workable go to a brushless motor and prop combination for efficiency.  A few amps over several hours is all I need.

John



--
Flatwater Electronics
www.flatwaterfarm.com
"Neurosurgery for computer looms."

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Posted by at No comments:

[Electric Boats] Re:Prop pitch for regeneration

 

Two good thoughts. 

Clearly using combined propulsion/regeneration is an inefficient compromise, and that it is important to consider the loss to drag.  I think the loss to drag is in many cases acceptable if the system efficiency gives the desired gain, and if having two separate systems is acceptable.  Redundancy is good in any case.

Michael, thanks for noting Watt&Sea.  I was not aware of how much work has been put into this by both the racers as well as cruisers.  Lots of good information there and elsewhere, especially looking at the props those type of systems use.

Seems like a starting point would be to start with a simple trolling motor and aftermarket prop and see what you get and how much it slows the boat down.  If that looks workable go to a brushless motor and prop combination for efficiency.  A few amps over several hours is all I need.

John



--
Flatwater Electronics
www.flatwaterfarm.com
"Neurosurgery for computer looms."

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Posted by: John Acord <jcacord@gmail.com>
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