Drilled Hole in Hull Repair - 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? 


Reply
 
LinkBack Thread Tools
  #1  
Old 08-04-2009
Senior Member
 
Join Date: Oct 2008
Location: Ottawa Canada
Posts: 209
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 7
weephee is on a distinguished road
Drilled Hole in Hull Repair

My sailboat came equipped with a water depth indicator. There is a 1 inch hole drilled through the hull about 2 feet below the waterline where the transmitter or whatever it is called exited the hull. I have remove all this old equipment and now need to fill in the hole. Question is how do I do it. The thickness of the hull at this point is 3/8 inches thick. Do I try and fiberlass in and over it or plug it with something. Both sides are accessible. Thanks
Reply With Quote Quick reply to this message Share with Facebook
  #2  
Old 08-04-2009
speciald's Avatar
Special Delivery
 
Join Date: Mar 2007
Location: live on boat
Posts: 661
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 8
speciald is on a distinguished road
Send a message via Skype™ to speciald
You don't need a depthfinder?
Reply With Quote Quick reply to this message Share with Facebook
  #3  
Old 08-04-2009
Senior Member
 
Join Date: Oct 2008
Location: Ottawa Canada
Posts: 209
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 7
weephee is on a distinguished road
Drilled Hole in Hull Repair

The boat also came with a 178C Garmin which has a depth sounder. The remote unit is glued to the inside of the hull and the old one which was thru the hull was no longer being used.
Reply With Quote Quick reply to this message Share with Facebook
  #4  
Old 08-04-2009
Sabreman's Avatar
Senior Member
 
Join Date: Sep 2006
Location: Yeocomico River, VA
Posts: 1,620
Thanks: 3
Thanked 15 Times in 12 Posts
Rep Power: 10
Sabreman will become famous soon enough Sabreman will become famous soon enough
I had a similar arrangement on my last boat.

You need to fill the hole:

1. Taper the inside and outside of the hole so that it's no longer a 90 degree edge. Sort of like a sink drain.
2. Remove all traces of paint on the inside and outside. Wipe with acetone
3. Obtain fibreglass roving cloth. Cut several pieces the size of the hole
4. Tape over the outside of the hole with masking or duct tape to temporarily seal the hole.
5. Mix up some West Epoxy or equivalent, soak the roving, and insert in the hole. Repeat once more. Tamp gently to remove air bubbles (This is really important). Let stand until hardened
6. Remove the tape from the outside
7. Repeat #5 until desired thickness is achieved. Make sure to remove all air bubbles.
8. Cut and epoxy a larger cloth piece to overlap the edges of the hole by about 1" and apply to the inside of the hole.
9. Mix collodial silca to thicken the epoxy and fair the outside of the hole.
__________________
Sabre 38 "Victoria"
Reply With Quote Quick reply to this message Share with Facebook
  #5  
Old 08-04-2009
Senior Member
 
Join Date: Oct 2008
Location: Ottawa Canada
Posts: 209
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 7
weephee is on a distinguished road
Drilled hole in Hull repair

To Saberman: With the thickness of the hull being 3/8 inches do I fill the hole at one time with the epoxy and roving cloth or do I do it in stages and once it is full do I apply a larger piece on the inside as I should do on the outside. Thanks
Reply With Quote Quick reply to this message Share with Facebook
  #6  
Old 08-04-2009
Sabreman's Avatar
Senior Member
 
Join Date: Sep 2006
Location: Yeocomico River, VA
Posts: 1,620
Thanks: 3
Thanked 15 Times in 12 Posts
Rep Power: 10
Sabreman will become famous soon enough Sabreman will become famous soon enough
I would do it in stages. Put in a couple of of layers of cloth, get rid of the air bubbles, let it harden, then a couple more, repeating untill all 3/8" is filled. When all is done, apply the last layer of roving on the inside.

I hesitate to put a layer on the outside because fairing it will be a real pain and you'll probably sand it all away anyway. That's why I suggested using collodial silca as a fairing. You can usea a lower density West fairing compound, but the silca is really strng stuff and this is an important repair.

To put the repair in perspective, it's a small hole and not in a load bearing area, so ther really isn't a need to cover the outside with cloth. After you fill with all the layers of roving (NOT mat) and the final layer inside, the repair will be as strong as the area around it. MAYBE if you pounded a hammer on the exact hole, MAYBE it would give, but I doubt it. There may be some disagreement on this, but I would feel confident with this repair on my boat.

All things considered, this is a simple repair and can be completed in a couple of days (most of the time is spent waiting for the epoxy to cure). A note of caution - don't cheap-out and use fibreglass resin. Use epoxy.
__________________
Sabre 38 "Victoria"
Reply With Quote Quick reply to this message Share with Facebook
  #7  
Old 08-04-2009
DwayneSpeer's Avatar
Old Fart
 
Join Date: Oct 2003
Location: Pasco, WA, USA
Posts: 514
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 12
DwayneSpeer is on a distinguished road
Quote:
Originally Posted by Sabreman View Post
I had a similar arrangement on my last boat.

You need to fill the hole:

1. Taper the inside and outside of the hole so that it's no longer a 90 degree edge. Sort of like a sink drain.
2. Remove all traces of paint on the inside and outside. Wipe with acetone
3. Obtain fibreglass roving cloth. Cut several pieces the size of the hole
4. Tape over the outside of the hole with masking or duct tape to temporarily seal the hole.
5. Mix up some West Epoxy or equivalent, soak the roving, and insert in the hole. Repeat once more. Tamp gently to remove air bubbles (This is really important). Let stand until hardened
6. Remove the tape from the outside
7. Repeat #5 until desired thickness is achieved. Make sure to remove all air bubbles.
8. Cut and epoxy a larger cloth piece to overlap the edges of the hole by about 1" and apply to the inside of the hole.
9. Mix collodial silca to thicken the epoxy and fair the outside of the hole.
Following this repair method will result in a very week spot in your hull that could pop out under severe weather conditions. Don't do it! Do it right or hire it done by a professional! Doing it right involves grinding the hole back at a 12 to 1 ratio. That means that for your 3/8 inch thick hull the outer edges of your ground out area will be 4.5 inches away. Then gradually build up with larger and larger pieces of fiberglass roving until the final piece is the full 10 inches diameter. Actually Ferenc Mate says in his book "Shipshape, The Art of Sailboat Maintenance" that if the hull is greater than 1/4 inch thick then the ground out ratio should be 15 to 1 but everyone else that I've read recommend only a 12 to 1 ratio.

The rest of Sabreman's recommendations are quite good. That is cleaning the area very well, etc.
__________________

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


Hey, can one of you guys pass me a crab?


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
  #8  
Old 08-04-2009
Senior Member
 
Join Date: Aug 2008
Location: Seattle
Posts: 258
Thanks: 0
Thanked 4 Times in 4 Posts
Rep Power: 7
baboon is on a distinguished road
One option to consider is to leave the transducer in place. It is a solid plug and has no moving parts. Many feel the depth sounder is the most important instrument, and having a back up ready to go is not a bad idea. A through hull transducer will also be more acurate, although I understand the newer surface mounts are pretty good. It seems different manufactures of displays use the same transducers so you may have options as to how to read the depth.
Reply With Quote Quick reply to this message Share with Facebook
  #9  
Old 08-04-2009
Senior Member
 
Join Date: Jul 2008
Location: chesapeake bay
Posts: 1,942
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 7
scottyt is on a distinguished road
here are the west systems video's on basicly what and how you want to do it

now you dont need to cut the hole bigger like they, also for a 1 inch hole you wont need the piece backing the hole up. i would use 7 OZ glass not roving, roving is hard to wet out with resin. the big trick i dont think they show on the vid is when you have the glass in place cover it with a piece of a trash bag then squeegee as much resin out as you can. the glass is the strength the resin holds it together

part one

part 2
Reply With Quote Quick reply to this message Share with Facebook
  #10  
Old 08-04-2009
Sabreman's Avatar
Senior Member
 
Join Date: Sep 2006
Location: Yeocomico River, VA
Posts: 1,620
Thanks: 3
Thanked 15 Times in 12 Posts
Rep Power: 10
Sabreman will become famous soon enough Sabreman will become famous soon enough
DwayneSpeer is correct. In my defense, in Step#1 where I indicate that a taper is to be made, Dwayne's suggestion is what I was getting at but did not adequately describe. I didn't have an exact ratio in mind, either 12:1 or 15:1 but something along those lines. Either way, it's easy to draw a 4.5" "target" circle and grind to the circle.

I really don't think that roving is that hard to wet. Using gloves, dip it into a tray or similar container with epoxy until wet. I suggested roving because it is stronger and builds quickly.

I wouldn't leave the transducer in place. I did that on our last boat and it was a mistake. The o rings will eventaully dry out and a leak is waiting to happen. Much better to do the job right and debate these details, IMHO.

Thanks guys, for the suggestions. This is what makes Sailnet great. I was not aware of the ratios even though I've done this job and other similar jobs in boatyards and my own boats for nearly 30 years. We always made a taper, but not to a specified ratio. In retrospect, we were pretty close but relied on eyeballing it.

Thanks.... learned something new again.
__________________
Sabre 38 "Victoria"

Last edited by Sabreman; 08-04-2009 at 05:13 PM. Reason: clarity
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
Yet another seacock thread danielgoldberg Gear & Maintenance 13 08-12-2008 11:36 AM
470 hull repair? jpitz31 Gear & Maintenance 3 10-23-2006 05:13 PM
New Shine for an Old Hull Don Casey Gear and Maintenance Articles 0 01-08-2002 08:00 PM


All times are GMT -4. The time now is 01:08 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.