SailNet Community - Reply to Topic

   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) > Bow Rollers
 Not a Member? 


Thread: Bow Rollers Reply to Thread
Title:
  

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

Message:
Trackback:
Send Trackbacks to (Separate multiple URLs with spaces) :
Post Icons
You may choose an icon for your message from the following list:
 

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.



Click here to view the posting rules you are bound to when clicking the
'Submit Reply' button below


Additional Options
Miscellaneous Options

Click here to view the posting rules you are bound to when clicking the
'Submit Reply' button below


Topic Review (Newest First)
02-22-2010 11:35 PM
sailingdog The gypsy on most modern windlasses will handle both rope and chain. For instance, the windlass on my boat has a gypsy that is designed to handle 5/16" G43 high-test chain and 9/16" or 5/8" nylon rope. The chain size is very specific to the windlass gypsy, and putting the wrong size chain on the gypsy can damage it..

The capstan, or drum, which projects above the gypsy on some windlasses, like mine, is used for hauling in an all rope anchor rode. If the windlass is a vertical design, like that in the drawing I posted, the drum can also be used to haul up a dinghy via a block and tackle or halyard led to a snatch block.

Vertical windlasses, however, require a deeper chain locker for the anchor rode to fall properly. They tend to be a bit more secure in holding the rode, since they take a 180˚ wrap on the gypsy, rather than the 90˚ found on a horizontal windlass. They’re a bit more useful, as the capstan can be used for things other than an anchor rode as mentioned above.

A horizontal windlass is often a better choice for a boat with two anchors and two bow rollers, since many horizontal windlasses have the gypsy on one side and the capstan on the other. They require less distance for the rode to fall into the chain locker, since the rode only wraps 90˚ and is dropping off the gypsy or capstan into the chain pipe. Here is a lighthouse horizontal windlass:



Either horizontal or vertical windlasses can be operated remotely if they are properly setup and equipped with a bow roller that pivots and self-launches. To set the anchor, you would free it—undoing any lashings or pins that secure the anchor while underway. Then you would either let the gypsy freefall or let out some rode. This would allow the bow roller to pivot under the weight of the anchor and self-launch the anchor. I prefer to control the rode feeding out rather than let it freefall, since it is far less likely to end up in a pile on top of the anchor and possibly foul the anchor and prevent it from setting. As the anchor is dropping towards the bottom, you would allow the wind to push the boat backwards a bit....until you have enough rode out to set the anchor. Many anchors can be set at 5:1 scope, but you would be wise to let out 7:1 or 8:1 scope if conditions are going to be rougher....
02-22-2010 11:20 PM
elkscout Very Nice explanation. From the drawing I guess I was mistaking the gypsy to function as a drum would on a winch. So, it looks like the windlass assy. "holds on" to the rode and retrieves it/pulls it up and, in the example of your illustration, feeds it into the locker.

Okay, so what's the gypsy's function? For wrapping short amount of rode?

I guess I'm trying to equate the setup to those found on large ships, and I was under the impression there were styles? to allow the task to be performed entirely from a remote location, specifically the cockpit (for anchorages under calm conditions).
02-22-2010 10:52 PM
sailingdog Depends on the configuration of the bow of your boat, as well as what anchor you're planning on putting on the roller.

Quote:
Originally Posted by nereussailor View Post
Not to hijack this thread, but how do you know which bow roller to buy. I've been considering one, but Im not sure which one to get. I'm sure that SD has a formula, so lets hear it.

Dave
02-22-2010 09:21 PM
nereussailor
Bow roller

Not to hijack this thread, but how do you know which bow roller to buy. I've been considering one, but Im not sure which one to get. I'm sure that SD has a formula, so lets hear it.

Dave
02-22-2010 12:45 PM
sailingdog
Quote:
Originally Posted by elkscout View Post
If a boat has some sort of windlass (particularly motorized), is a bow roller still necessary, or at least the retention pin? It seems counter-productive for those with windlass controls in the cockpit.
A bow roller is kind of a necessity if you have a windlass. The anchor and the rode have to be stowed somehow when sailing around the harbor. The easiest way is to have a bow roller... Don't generally recommend pinning the anchor to the bow roller. If the anchor gets hit by a large wave, the pin could get bent and prevent you from being able to deploy the anchor. The anchor, especially if it is a rollbar design like the Rocna, should be lashed into position. In an emergency, the lashing can be quickly cut to free the anchor.

Remember, that the anchor is an important piece of safety gear. If you run into trouble with the boat, you can often anchor to give yourself some time to sort things out.

Quote:
And as for windlasses, does the chain portion between the rode and anchor wrap up around it as well? Surely not. It sounds typical to have anywhere from 50 to 100' or more of chain, plus another 100 to 200' of rode. Seems like one would need a windlass with a huge drum to reel all that up.
The chain is part of the rode. The anchor rode consists of everything between the anchor and the boat....the anchor shackle, the chain, and the nylon rope. The windlass doesn't store the rode around a spool or drum. You're thinking of the winch off of a jeep or something like that... which isn't the case here. The windlass is used to retrieve the anchor and pulls the rode in, but the rode itself is actually stowed in the anchor or chain locker, usually through a chainpipe of some sort. See the following image:

02-22-2010 12:10 PM
AdamLein Bow roller: if you lacked a bow roller, what would be the point at which the rode went from going sideways from the windlass, to downward into the water? You don't want it to just hang out over the gunwales Windlasses are usually mounted on the deck, you know.

I don't have a windlass, but I understand that at least some of them have a chain portion (toothy) and a rope portion (smooth like a winch drum). I'm not sure how you make sure that it switches from one to the other appropriately. It may require that you go forward.

Very little of the rode stays on the drum. Just as with winch drums, the tail of the line goes someplace else and only a few coils stay on the drum at the time. In the case of the windlass, the rode and chain should be redirected to a locker somewhere belowdecks.
02-22-2010 11:53 AM
elkscout
Bow Rollers

If a boat has some sort of windlass (particularly motorized), is a bow roller still necessary, or at least the retention pin? It seems counter-productive for those with windlass controls in the cockpit.

And as for windlasses, does the chain portion between the rode and anchor wrap up around it as well? Surely not. It sounds typical to have anywhere from 50 to 100' or more of chain, plus another 100 to 200' of rode. Seems like one would need a windlass with a huge drum to reel all that up.

 
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


All times are GMT -4. The time now is 05:16 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.