Converting my manual windlass to electric! The math is giving me a migraine... - Page 2 - SailNet Community
 1Likes
Reply
 
LinkBack Thread Tools
post #11 of 21 Old 12-15-2011 Thread Starter
Closet Powerboater
 
MedSailor's Avatar
 
Join Date: Mar 2008
Location: Anacortes PNW
Posts: 3,919
Thanks: 298
Thanked 124 Times in 112 Posts
Rep Power: 9
 
Quote:
Originally Posted by tdw View Post
My point is that MedSailor is planning on a long tem cruise not simply a weekend here or there.
Yes I probably should, and will, end up with a massive lofrans or similar setup. I do like your suggestion of finding one where the motor can be removed without too much hassle. That should help allay my fears of it seizing. Even though it'll likely be money well spent the huge expense of a windlass is hard to swallow, especially when there could be a cheaper option lurking....

Quote:
We actually managed to hook onto a sunken trawler once. The part of the things bridge that came to the surface and had to be cut away from our anchor weighed well over a 100lbs. Without our lovingly repaired windlass I would never have got the thing to the surface and would have either been forced to cut the chain or stay hooked on and dive or get a diver to go down. Our windlass was able to bring it to the surface and hold it in place while I cut away the debris with bolt cutters.
WOW. Which windlass was that? What sizing algorithm did you use??

Medsailor

PS Any info on average depth of anchorages in OZ?

I have a sauna on my boat, therefore I win.
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
MedSailor is offline  
Quote Quick Reply Share with Facebook
Sponsored Links
Advertisement
 
post #12 of 21 Old 12-16-2011
tdw
Super Fuzzy Moderator
 
tdw's Avatar
 
Join Date: Oct 2006
Location: Sydney Australia
Posts: 17,079
Thanks: 20
Thanked 125 Times in 116 Posts
Rep Power: 10
     
Quote:
Originally Posted by MedSailor View Post
Yes I probably should, and will, end up with a massive lofrans or similar setup. I do like your suggestion of finding one where the motor can be removed without too much hassle. That should help allay my fears of it seizing. Even though it'll likely be money well spent the huge expense of a windlass is hard to swallow, especially when there could be a cheaper option lurking....



WOW. Which windlass was that? What sizing algorithm did you use??

Medsailor

PS Any info on average depth of anchorages in OZ?
Med,
Sizing Algorrithm ? Wow. I have no idea what that actually means.

The windlass was (is) a Muir Cub. Muir themselves reckon it is undersized for that boat (the old girl) but once I had rebuilt it, it performed faultlessly. By the time we had the piece of the trawler just below the surface the windlass was straining but it did the job. Pulled the bow done about 12'' from memory, this on a 34' steel sloop around 7t. I was impressed.

Anchorages in Oz will vary a great deal. StAnna would have more info for up north than I would but the deepest water I have anchored in was 25metres and that was unusual. It was of course here that the Muir gave up the ghost and I had to haul in 35 metres of chain (plus line and anchor of course). On that occasion the gearbox had completely stripped itself but the motor was still OK so I had a bit of help. Later, having replaced the gearbox, the motor also died and then I used sheet winch which worked but was slow and tedious. Overall I should have heeded Muir's advice and simple bought a new one but to their credit they still helped with the rebuild.

Ref the seizing, i still think it is more likely that an electrical motor when burnt out would still spin and that a seizing problem would be more gears or shaft related. (I could be wrong of course).

Andrew B (Malö 39 Classic)

“Life is a trick, and you get one chance to learn it.”
― Terry Pratchett.
tdw is offline  
Quote Quick Reply Share with Facebook
post #13 of 21 Old 12-19-2011
Senior Member
 
Join Date: Oct 2011
Location: Nanaimo B.C.
Posts: 3,151
Thanks: 3
Thanked 87 Times in 86 Posts
Rep Power: 5
 
How many pound feet per minute is one and a third horsepower? Do you figure that would be enough power to pull 500 lbs of chain from a deep water drop in a reasonable time, say 5 min at a manageable speed? They're not called wild cats for nothing .(hint 550 per min=1 hp)Anything left over could be helpful with sunken logs, boomchains and just stuff.
Capt Len is offline  
Quote Quick Reply Share with Facebook
post #14 of 21 Old 12-19-2011 Thread Starter
Closet Powerboater
 
MedSailor's Avatar
 
Join Date: Mar 2008
Location: Anacortes PNW
Posts: 3,919
Thanks: 298
Thanked 124 Times in 112 Posts
Rep Power: 9
 
Quote:
Originally Posted by Capt Len View Post
.(hint 550 per min=1 hp)
Can you elaborate on the hint? How did you transpose HP to feet per minute? Wouldn't tbe speed be dictated by rotation speed of the motor and gearing?

Medsailor

I have a sauna on my boat, therefore I win.
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
MedSailor is offline  
Quote Quick Reply Share with Facebook
post #15 of 21 Old 12-20-2011
Junior Member
 
Join Date: Jul 2007
Posts: 19
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 0
 
excuse me, but 1 hp is 33,00 ft/lbs per minute. a larger than average horse can lift a 330 lb weight 100 feet in about one minute....therefore 1 hp.

550 is the amount of work done in one second....33000/60....

just so we are all on the same page here....
Wolf
rg500 is offline  
Quote Quick Reply Share with Facebook
post #16 of 21 Old 12-20-2011
Senior Member
 
Join Date: Oct 2011
Location: Nanaimo B.C.
Posts: 3,151
Thanks: 3
Thanked 87 Times in 86 Posts
Rep Power: 5
 
Sorry wolf. It appears I've forgot more grade10 physics than I thought . think of it as an elder moment.I should have reread what I mumbled.
Capt Len is offline  
Quote Quick Reply Share with Facebook
post #17 of 21 Old 12-20-2011
Junior Member
 
Join Date: Jul 2007
Posts: 19
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 0
 
not a problem, it will be my turn next....
rg500 is offline  
Quote Quick Reply Share with Facebook
post #18 of 21 Old 08-12-2014
Junior Member
 
Join Date: Aug 2014
Posts: 17
Thanks: 0
Thanked 2 Times in 2 Posts
Rep Power: 0
 
Re: Converting my manual windlass to electric! The math is giving me a migraine...

Here's a Product;
A full-time cruising boat has need of occasional extra muscle, but since flogging is illegal, having slave crew is a bit fussy nowadays. Wouldn't it be great to flog the rowers to shore, drum the anchor crew 3 times in a stormy night's poor anchorage, or send 'em to shore to haul fresh water!?
Enter technology;
A modern substitute might be a portable power head, maybe based on the Robin 50cc engine, which you would temporarily clamp onto your manual windlass via chain drive. Then to your Outboard's lower unit, or to your CAT Pump water-maker. One chunk of small engine for all three jobs of Windlass, outboard, and watermaker. Plus more, i'm sure.... on a smaller Cruiser, such a modular system could save much space & weight. Crazy or Brilliant?
CaptnBry is offline  
Quote Quick Reply Share with Facebook
post #19 of 21 Old 08-13-2014
Senior Member
 
Join Date: Oct 2011
Location: Nanaimo B.C.
Posts: 3,151
Thanks: 3
Thanked 87 Times in 86 Posts
Rep Power: 5
 
Re: Converting my manual windlass to electric! The math is giving me a migraine...

Can you guarantee it's going to start? If not, a lot of stuff is ballast.
Capt Len is offline  
Quote Quick Reply Share with Facebook
post #20 of 21 Old 08-13-2014
Master Mariner
 
capta's Avatar
 
Join Date: Jun 2011
Location: somewhere south of civilization
Posts: 3,089
Thanks: 58
Thanked 153 Times in 144 Posts
Rep Power: 6
 
Re: Converting my manual windlass to electric! The math is giving me a migraine...

I believe your fears on this one are groundless. Our old Tigress windlass was over 30 years old when we replaced it, and operating flawlessly when we did so, electrically. Unfortunately the legs had corroded off it and it was no longer secured well to the deck.
If you buy a quality windless it should last over 30 years, and longer if you wash the salt off and cover it. A new Tigress (a good size for your boat and an easy install) can be had for around $1500 complete. Do not buy a vertical as they are a difficult install compared to a horizontal windlass and less reliable. Though every electric windlass does have a manual back up, in many instances your gene sheet winches might be a better solution to an electrical failure, anyway.

"Any idiot can make a boat go; it takes a sailor to stop one." Spike Africa aboard the schooner Wanderer in Sausalito, Ca. 1964.

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

facebook.com/svskippingstone
Our Videos;

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


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


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
capta is offline  
Quote Quick Reply 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:
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 Windlass Marcvet Gear & Maintenance 7 01-01-2012 03:33 AM
Installing electric windlass -- need a pro! svbliss Gear & Maintenance 3 06-11-2010 06:03 AM
Beneteau 321 Electric Windlass sailmanray Gear & Maintenance 30 03-15-2007 10:47 AM
Lighthouse 1501 Electric/Manual Windlass? capecodphyllis Gear & Maintenance 8 03-01-2007 04:18 AM
Install electric windlass orionatc Gear & Maintenance 6 04-12-2003 03:33 AM

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