Combining two electric trolling motors - SailNet Community
 
LinkBack Thread Tools
post #1 of 9 Old 03-16-2010 Thread Starter
The King of Kong
 
Join Date: Mar 2010
Posts: 24
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 0
 
Combining two electric trolling motors

Would combining two electric trolling motors be the same as having one of the higher thrust?

Let's say you can get two 50LB for $300, or 1 101LB for $800.
a1fa is offline  
Quote Quick Reply Share with Facebook
Sponsored Links
Advertisement
 
post #2 of 9 Old 03-17-2010
Senior Member
 
Join Date: Dec 2009
Location: Central Arkansas
Posts: 209
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 6
 
By combining, do you mean side by side mounting?
I suspect that you would encounter issues with turbulence with the two props. iirc twin prop ships rotate opposite one another.
What are you trying to push?
tomwatt is offline  
Quote Quick Reply Share with Facebook
post #3 of 9 Old 03-17-2010 Thread Starter
The King of Kong
 
Join Date: Mar 2010
Posts: 24
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 0
 
I was wondering if you would get the same effect as if you had one bigger thrust motor. I can mount them on port and starboard side.
a1fa is offline  
Quote Quick Reply Share with Facebook
post #4 of 9 Old 03-17-2010
Telstar 28
 
sailingdog's Avatar
 
Join Date: Mar 2006
Location: New England
Posts: 43,290
Thanks: 0
Thanked 14 Times in 12 Posts
Rep Power: 14
         
Also, the battery bank you'd need to run two trolling motors is rather heavy.

Sailingdog

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

Telstar 28
New England

You know what the first rule of sailing is? ...Love. You can learn all the math in the 'verse, but you take
a boat to the sea you don't love, she'll shake you off just as sure as the turning of the worlds. Love keeps
her going when she oughta fall down, tells you she's hurting 'fore she keens. Makes her a home.

—Cpt. Mal Reynolds, Serenity (edited)

If you're new to the Sailnet Forums... please read this
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
.

Still—DON'T READ THAT POST AGAIN.
sailingdog is offline  
Quote Quick Reply Share with Facebook
post #5 of 9 Old 03-17-2010
Senior Member
 
bljones's Avatar
 
Join Date: Oct 2008
Location: South Coast Ontario
Posts: 8,468
Thanks: 35
Thanked 89 Times in 80 Posts
Rep Power: 8
   
There is no advantage and probably no real cost savings.

I'm sure one or two of the "silent runnings" types will come along and clarify my numbers, but here's my thinking: Theoretically, you would get twice the thrust, but you need two banks of batteries, so twice the weight, and nearly twice the consumption as running a single motor with higher thrust. Over the long term you will have to replace twice as many batteries, and have twice as many moving parts to maintain, which is why there is likely no long term cost savings over a single motor.

The only real advantage is that you could improve your tight quarters maneuvering.
bljones is offline  
Quote Quick Reply Share with Facebook
post #6 of 9 Old 03-17-2010
Telstar 28
 
sailingdog's Avatar
 
Join Date: Mar 2006
Location: New England
Posts: 43,290
Thanks: 0
Thanked 14 Times in 12 Posts
Rep Power: 14
         
Actually, there's no reason you couldn't run them both off a single battery bank. That would be better than having two separate battery banks, because of the Peukert factor and such.
Quote:
Originally Posted by bljones View Post
There is no advantage and probably no real cost savings.

I'm sure one or two of the "silent runnings" types will come along and clarify my numbers, but here's my thinking: Theoretically, you would get twice the thrust, but you need two banks of batteries, so twice the weight, and nearly twice the consumption as running a single motor with higher thrust. Over the long term you will have to replace twice as many batteries, and have twice as many moving parts to maintain, which is why there is likely no long term cost savings over a single motor.

The only real advantage is that you could improve your tight quarters maneuvering.

Sailingdog

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

Telstar 28
New England

You know what the first rule of sailing is? ...Love. You can learn all the math in the 'verse, but you take
a boat to the sea you don't love, she'll shake you off just as sure as the turning of the worlds. Love keeps
her going when she oughta fall down, tells you she's hurting 'fore she keens. Makes her a home.

—Cpt. Mal Reynolds, Serenity (edited)

If you're new to the Sailnet Forums... please read this
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
.

Still—DON'T READ THAT POST AGAIN.
sailingdog is offline  
Quote Quick Reply Share with Facebook
post #7 of 9 Old 03-17-2010 Thread Starter
The King of Kong
 
Join Date: Mar 2010
Posts: 24
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 0
 
Too bad. I took my Johnson SeaHorse 6hp back to the mechanic to check it out and replace water pump if need be. Good little motor.
a1fa is offline  
Quote Quick Reply Share with Facebook
post #8 of 9 Old 03-17-2010 Thread Starter
The King of Kong
 
Join Date: Mar 2010
Posts: 24
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 0
 
The reason why I wanted to go electric is:

SeaHorse is a bit heavy. Actually, very heavy to lift out of the water to start, or put back.
It's hard to start.. Starter gear has never worked right with the height of the motor. I end up tying a rope on the fly wheel.. It's much easier to pull and the angle is not bad.
a1fa is offline  
Quote Quick Reply Share with Facebook
post #9 of 9 Old 08-18-2011
Junior Member
 
Join Date: Sep 2010
Posts: 9
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 0
 
rewire motor?

I would think you could just flip the wires to the actual motor so it runs in reverse. But, then you would have to get reverse threaded propeller. I use to do this as an electrition in some weird cases. I'm thinking of this actually because getting two used trolling motors is way cheaper than one new powerful one that never goes on ebay or craigs.
caver504 is offline  
Quote Quick Reply Share with Facebook
Reply

Quick Reply
Message:
Options

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:
OR

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
Show Printable Version Show Printable Version
Email this Page Email this Page



Similar Threads
Thread Thread Starter Forum Replies Last Post
electric trolling motors for small sailboats? thebrakes General Discussion (sailing related) 18 07-25-2010 01:29 PM
Electric Motors and Sailing Vessels Mark Matthews Gear and Maintenance Articles 0 11-17-2002 07:00 PM
Choosing and Installing an Electric Windlass Sue & Larry Gear and Maintenance Articles 0 09-06-2002 08:00 PM
The Great Windlass Debate SailNet Seamanship Articles 0 11-30-2001 07:00 PM
The Great Windlass Debate SailNet Gear and Maintenance Articles 0 11-30-2001 07:00 PM

Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome