What kind of boom is this? - SailNet Community
LinkBack Thread Tools
post #1 of 5 Old 04-23-2006 Thread Starter
Senior Member
Join Date: Nov 2005
Posts: 105
Thanks: 1
Thanked 0 Times in 0 Posts
Rep Power: 11
What kind of boom is this?

This winter I purchased an old Irwin 38, 1970. while checking out all the little things you find with a "new" boat I noticed the boom seems to be an old furling boom. There is a bevel gear at the gooseneck to wrap the sail around the boom, there's a bearing at the end so the boom lift and main sheet don't twist.There is another winch fitting by the gooseneck to adj. the clew outhaul. I can't find a brand name or any #s on the boom anywhere. Anybody have any idea about this contraption,or if I,ll ruin my sails wrapping them around the boom instead of flaking them on top?
I took her out this weekend in about 12 Knot breezes, goes like stink!
Thanks in advance for any help, Art.
Artwerke is offline  
Quote Quick Reply Share with Facebook
Sponsored Links
post #2 of 5 Old 04-23-2006
Telstar 28
sailingdog's Avatar
Join Date: Mar 2006
Location: New England
Posts: 43,290
Thanks: 0
Thanked 18 Times in 14 Posts
Rep Power: 15
A photo would help immeasureably... Sounds like an older mainsail boom-based roller furling design...but a photo would help a lot.
sailingdog is offline  
Quote Quick Reply Share with Facebook
post #3 of 5 Old 04-23-2006
Senior Member
Join Date: Jun 2004
Location: West Michigan
Posts: 515
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 13
Sounds like the same type of boom as is on my 67 triton, People claim they work 'alright' problems are that the sail looses a lot of shape when furled, and you need a 'claw' many people I've spoken with have mentioned tossing a seat cushion or jacket in the roll to help keep the sail in shape,
Mine has a crank on the underside that operates the outhaul through a cable, and a worm gear assembly at the gooseneck to furl the sail, never used the system as the boom was set up for regular reefing when I bought it.
I have the claw, with a length of line abou 10ft, nicely whipped at the bitter end, but see no real reason to use it, or anyplace to connect it when the sail is furled. should say It slips over the sail and boom when it's furled, but I see nowhere that it can be connected afterwards.

merc2dogs is offline  
Quote Quick Reply Share with Facebook
post #4 of 5 Old 04-23-2006
Telstar 28
sailingdog's Avatar
Join Date: Mar 2006
Location: New England
Posts: 43,290
Thanks: 0
Thanked 18 Times in 14 Posts
Rep Power: 15
The other way these booms can be modified to work with a better sail shape is to add some tapered wedges to the boom, so the sail is flattened properly as it is rolled up.
sailingdog is offline  
Quote Quick Reply Share with Facebook
post #5 of 5 Old 04-24-2006
Jeff_H's Avatar
Join Date: Feb 2000
Location: Annapolis, Md
Posts: 7,248
Thanks: 8
Thanked 215 Times in 166 Posts
Rep Power: 10
It sounds like a roller reefing boom. They used to be as common as dirt as almost every production boat from the mid-1960's until the mid-1970's had one. It was a lousy system. It took forever to crank in a reef because the halyard had to be eased a little bit at a time (a serious problem when coupled with the reel winches that were popular during this period) and then take a crank on the reel winch. There was no way to tension the foot as the sail was rolled in. Wedges or throwing a coat into the roll would not help since the leech of the sail will still creep foward as rolled. Sails of that era were cut with almost no broadseaming and without a shelf foot, but modern sails would not work at all on a roller reefing boom.

My best advice is to go to a two line, slab reefing system. Its fast, cheap, reliable and it allows independent luff and foot adjustments.

Jeff_H is online now  
Quote Quick Reply Share with Facebook

Quick Reply

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:
Please enter a password for your user account. Note that passwords are case-sensitive.


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:


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
Replacing boom parts toquimanu Gear & Maintenance 2 04-06-2005 07:42 AM
Boom Vang z1nonlyone General Discussion (sailing related) 4 08-22-2003 06:51 PM
Boom Vang z1nonlyone Gear & Maintenance 5 08-21-2003 08:51 AM
Sail covers for loonnnggg mizzen boom kbennett17 Gear & Maintenance 1 08-06-2002 12:49 PM
Boom Vangs kikisteve Gear & Maintenance 10 01-09-2002 08:02 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