Porthole Question - 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 04-28-2007
Alden68's Avatar
Armchair Horn Sailor
 
Join Date: Mar 2007
Posts: 319
Thanks: 1
Thanked 1 Time in 1 Post
Rep Power: 8
Alden68 is on a distinguished road
Porthole Question

Prior to removal, my portholes were originally screwed into the fiberglass hull from the inside. My plan is to re-attach by bolting through the hulll from the outside with the bolt head and washer resting directly on the fiberglass (with the appropriate sealant).

Does anyone see any problems with this installation other than drilling 40 holes in my boat? Why were they secured from the inside with screws in the first place? That seems like a really weak installation as a force from the outside could (and did) easily push the porthole in.

Thanks.
Reply With Quote Share with Facebook
  #2  
Old 04-28-2007
Alden68's Avatar
Armchair Horn Sailor
 
Join Date: Mar 2007
Posts: 319
Thanks: 1
Thanked 1 Time in 1 Post
Rep Power: 8
Alden68 is on a distinguished road
woops meant to post this under gear & maintenance......
Reply With Quote Share with Facebook
  #3  
Old 04-28-2007
sailingdog's Avatar
Telstar 28
 
Join Date: Mar 2006
Location: New England
Posts: 43,291
Thanks: 0
Thanked 9 Times in 9 Posts
Rep Power: 13
sailingdog is just really nice sailingdog is just really nice sailingdog is just really nice sailingdog is just really nice sailingdog is just really nice
I would put the port glazing material on the outside... that way the material's tensile strength is part of what is holding the water out and the seal between the glazing and the hull only increases as the water pressure against it goes up. Having the glazing material on the interior of the hull is rather stupid IMHO... since any pressure against the glazing will tend to open voids in the seals around the glazing. Many new boats have dead lights that are panes of plexiglass or polycarbonate that are thrubolted to the cabin top.

When you're dealing with liquids under pressure, you always want to design it such that any increase in pressure aids the sealing systems, rather than weakens it.

IIRC, you should drill the holes slightly oversize as polycarbonate and plexiglass both expand and contract at a different rate from the fiberglass, so the bolts will move slightly relative to the glazing material.
__________________
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.
Reply With Quote Share with Facebook
Reply


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
Ladder question mcain Gear & Maintenance 14 08-03-2007 10:28 PM
Replacing crazed lexan hatches - updated question rryan14 Gear & Maintenance 13 03-16-2007 09:21 PM
Quick displacement question... kclaybrook General Discussion (sailing related) 19 07-13-2006 08:30 PM
Cruising home/base/marina ICW question thorJ30 General Discussion (sailing related) 3 05-30-2005 05:53 PM
question on sails Mark_OD23 General Discussion (sailing related) 6 11-19-2002 04:41 PM


All times are GMT -4. The time now is 07:53 AM.

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.