Hacking a trolling motor into a towed type generator - SailNet Community

   Search Sailnet:

 forums  store  


Quick Menu
Forums           
Articles          
Galleries        
Boat Reviews  
Classifieds     
Search SailNet 
Boat Search (new)

Shop the
SailNet Store
Anchor Locker
Boatbuilding & Repair
Charts
Clothing
Electrical
Electronics
Engine
Hatches and Portlights
Interior And Galley
Maintenance
Marine Electronics
Navigation
Other Items
Plumbing and Pumps
Rigging
Safety
Sailing Hardware
Trailer & Watersports
Clearance Items

Advertise Here






Go Back   SailNet Community > General Interest > General Discussion (sailing related)
 Not a Member? 


Like Tree4Likes
Reply
 
LinkBack Thread Tools
  #1  
Old 01-15-2013
Senior Member
 
Join Date: Sep 2011
Location: Liberty Landing
Posts: 668
Thanks: 0
Thanked 1 Time in 1 Post
Rep Power: 4
peterchech is on a distinguished road
Hacking a trolling motor into a towed type generator

Has anyone seen this done?

Its cheap, 12 volts, and draws about 40 amps. so if run wired to a diode then the house bank and powered up I speculate it could possibly pump out 10 amps. Total guess.

Might need a bigger prop, or one with a shallower angle, but I don't see why this couldn't work and if I'm right why more cheap sailors like myself haven't done it. It's even cheaper than solar if it works!

Reply With Quote Quick reply to this message Share with Facebook
  #2  
Old 01-15-2013
guitarguy56's Avatar
Senior Member
 
Join Date: Oct 2012
Posts: 540
Thanks: 7
Thanked 18 Times in 17 Posts
Rep Power: 3
guitarguy56 is on a distinguished road
Re: Hacking a trolling motor into a towed type generator

You might be thinking something like this? I see a lot of drag for a small sailboat...

Reply With Quote Quick reply to this message Share with Facebook
  #3  
Old 01-16-2013
Senior Member
 
Join Date: Dec 2010
Posts: 4,015
Thanks: 0
Thanked 141 Times in 125 Posts
Rep Power: 5
JonEisberg will become famous soon enough
Re: Hacking a trolling motor into a towed type generator

I have no idea whether it would be practical, but I would guess your estimate of 10 amps is exceedingly optimistic...

I use a towed generator from Hamilton Ferris, a fantastic piece of gear. I'm always surprised more cruisers on passage don't use water generators, though they do inhibit your ability to fish...

However, as effective as they are, mine generally puts out roughly 1 amp per knot of boat speed, perhaps a bit more above 5-6 knots... I probably see spurts close to 10 amps periodically, but getting that sort of performance consistently out of a cobbled-together arrangement with a trolling motor seems unlikely to me...
Reply With Quote Quick reply to this message Share with Facebook
  #4  
Old 01-16-2013
Senior Member
 
Join Date: Dec 2010
Posts: 4,015
Thanks: 0
Thanked 141 Times in 125 Posts
Rep Power: 5
JonEisberg will become famous soon enough
Re: Hacking a trolling motor into a towed type generator

Quote:
Originally Posted by guitarguy56 View Post
You might be thinking something like this? I see a lot of drag for a small sailboat...

Tow Generator at its Best - YouTube
Damn, that vid should be titled "Tow Generator at its WORST", that is one nasty looking set-up... The prop should not be breaking the surface like that, and whatever line they're using is totally unsuitable, becoming kinked and whipping around like that...
Reply With Quote Quick reply to this message Share with Facebook
  #5  
Old 01-16-2013
Senior Member
 
Join Date: Sep 2011
Location: Liberty Landing
Posts: 668
Thanks: 0
Thanked 1 Time in 1 Post
Rep Power: 4
peterchech is on a distinguished road
Re: Hacking a trolling motor into a towed type generator

Quote:
Originally Posted by JonEisberg View Post
Damn, that vid should be titled "Tow Generator at its WORST", that is one nasty looking set-up... The prop should not be breaking the surface like that, and whatever line they're using is totally unsuitable, becoming kinked and whipping around like that...
I guess the point would be not to tow it with a line, but rather to mount it directly off the transom using its existing shaft as a solid mount.
Reply With Quote Quick reply to this message Share with Facebook
  #6  
Old 01-16-2013
tommays's Avatar
Senior Member
 
Join Date: Sep 2008
Posts: 4,282
Thanks: 1
Thanked 29 Times in 29 Posts
Rep Power: 7
tommays will become famous soon enough
Re: Hacking a trolling motor into a towed type generator

I know a local person that runs the class 40 dragon and there top shelf land/sea or whatever water generator does NOT become efficient until there above 8 knots at which point the output is massive
__________________
1970 Cal 29 Sea Fever

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

1981 J24 Tangent 2930
Tommays
Northport NY


If a dirty bottom slows you down what do you think it does to your boat
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
Reply With Quote Quick reply to this message Share with Facebook
  #7  
Old 01-16-2013
Senior Member
 
Join Date: Dec 2010
Posts: 4,015
Thanks: 0
Thanked 141 Times in 125 Posts
Rep Power: 5
JonEisberg will become famous soon enough
Re: Hacking a trolling motor into a towed type generator

Quote:
Originally Posted by tommays View Post
I know a local person that runs the class 40 dragon and there top shelf land/sea or whatever water generator does NOT become efficient until there above 8 knots at which point the output is massive
No doubt you're thinking of the hydrogenerators from Watt & Sea...

VERY pricey, the cruising version is still over $5K, if memory serves... "Call for Quote" is rarely an encouraging sign... (grin)

Watt and Sea Cruising Hydrogenerator

Bernard Stamm recently was forced to retire from the Vendee Globe, due to the damage/failure of his water generators... Every boat in the race is using them, that's how dependent these guys (and girls) have become upon them...
Reply With Quote Quick reply to this message Share with Facebook
  #8  
Old 01-16-2013
Senior Member
 
Join Date: Sep 2008
Location: Charlotte, NC
Posts: 236
Thanks: 1
Thanked 10 Times in 10 Posts
Rep Power: 7
tschmidty is on a distinguished road
Re: Hacking a trolling motor into a towed type generator

The problem is that using a motor as a generator is that the voltage output is dependent on RPM so below a certain RPM you will not get any charge. Which is why motor charging systems use an alternator, which provide a more consistent voltage.

And you would definitely need a bigger prop or at least a hi-thrust version.

A better system would be a prop driving an alternator but would be much more DIY.

A quick google will show you that it is not really feasible.
Reply With Quote Quick reply to this message Share with Facebook
  #9  
Old 01-16-2013
chef2sail's Avatar
Senior Member
 
Join Date: Nov 2007
Location: Maryland
Posts: 7,050
Thanks: 30
Thanked 57 Times in 53 Posts
Rep Power: 8
chef2sail will become famous soon enough
Send a message via AIM to chef2sail
Re: Hacking a trolling motor into a towed type generator

What is the drag these produce on speed? I have often looked at these and wanted more informatuion on them.

Jon could you expand on your experiences with the Ferris one, I have seen them.

dave
__________________

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
___________________________
S/V Haleakala (Hawaiian for" House of the Sun")
C&C 35 MKIII Hull # 76
Parkville, Maryland
(photos by Joe McCary)
Charter member of the Chesapeake Lion posse

Our blog-
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.


“Sailing is just the bottom line, like adding up the score in bridge. My real interest is in the tremendous game of life.”- Dennis Conner
Reply With Quote Quick reply to this message Share with Facebook
  #10  
Old 01-16-2013
PaulinVictoria's Avatar
Remember you're a womble
 
Join Date: Aug 2009
Location: Sidney, BC
Posts: 1,919
Thanks: 7
Thanked 47 Times in 46 Posts
Rep Power: 6
PaulinVictoria is on a distinguished road
Re: Hacking a trolling motor into a towed type generator

Get a used electric troller and try it. I think the Watt and Sea ones start at $3200 or thereabouts.
__________________
Orange Crush
1974 C&C27 MkII

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
Reply With Quote Quick reply to this message Share with Facebook
Reply

Quick Reply
Message:
Options

By choosing to post the reply above you agree to the rules you agreed to when joining Sailnet.
Click Here to view those rules.

Register Now

In order to be able to post messages on the SailNet Community forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
Please note: After entering 3 characters a list of Usernames already in use will appear and the list will disappear once a valid Username is entered.
User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:

Log-in

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.




Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools

 
Posting Rules
You may post new threads
You may post replies
You may post attachments
You may edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On


Similar Threads
Thread Thread Starter Forum Replies Last Post
trolling motor mcnabbstacy Gear & Maintenance 3 07-29-2012 12:14 PM
hacking a trolling motor hertfordnc Gear & Maintenance 1 10-26-2008 05:05 PM
Does anyone use a Electric Trolling Motor poopdeckpappy Gear & Maintenance 23 10-19-2007 10:08 PM
trolling motor generator dodgeboatguy Gear & Maintenance 3 07-19-2007 04:22 PM
trolling motor generator dodgeboatguy Gear & Maintenance 0 07-18-2007 11:24 PM


All times are GMT -4. The time now is 02:39 PM.

Add to My Yahoo!         
Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
SEO by vBSEO 3.6.1
(c) Marine.com LLC 2000-2012

The SailNet.com store is owned and operated by a company independent of the SailNet.com forum. You are now leaving the SailNet forum. Click OK to continue or Cancel to return to the SailNet forum.