How can I identify the waterline from inside? - 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 > On Board > Gear & Maintenance
 Not a Member? 


Like Tree7Likes
Reply
 
LinkBack Thread Tools
  #1  
Old 10-10-2013
ericb760's Avatar
Been there, done that...
 
Join Date: Apr 2012
Location: Poway, CA
Posts: 1,302
Thanks: 12
Thanked 11 Times in 11 Posts
Rep Power: 3
ericb760 is on a distinguished road
How can I identify the waterline from inside?

Is there an easy or simple way to correctly identify the waterline while inside the boat? I'm contemplating an overhaul of the head system and need to install an airgap above the waterline but space is tight...
__________________
1969 S&S Yankee Dolphin 24 "Avri Ellis"
Reply With Quote Quick reply to this message Share with Facebook
  #2  
Old 10-10-2013
minnow1193's Avatar
Senior Member
 
Join Date: Dec 2011
Location: Apollo Beach, Fl
Posts: 208
Thanks: 3
Thanked 3 Times in 3 Posts
Rep Power: 3
minnow1193 is on a distinguished road
I would think if you are in still water, you could measure down from the deck joint outside, then make the same measurement inside (assuming you can locate the joint from inside. Or use any other reference point.
Reply With Quote Quick reply to this message Share with Facebook
  #3  
Old 10-10-2013
Senior Member
 
Join Date: Oct 2011
Posts: 1,354
Thanks: 6
Thanked 24 Times in 24 Posts
Rep Power: 4
Seaduction is on a distinguished road
Re: How can I identify the waterline from inside?

Attach a "water level" to an underwater thru hull fitting.
erps, T37Chef, jzk and 3 others like this.
Reply With Quote Quick reply to this message Share with Facebook
  #4  
Old 10-10-2013
erps's Avatar
the pointy end is the bow
 
Join Date: Aug 2006
Location: La Conner, Washington
Posts: 6,207
Thanks: 2
Thanked 26 Times in 26 Posts
Rep Power: 10
erps will become famous soon enough erps will become famous soon enough
Re: How can I identify the waterline from inside?

I would try a hand held infra red thermometer and shine it on the inside of the hull to see if can find the boundary between the water temperature and the air temperature.
__________________
Ray
S.V. Nikko
1983 Fraser 41
La Conner, WA


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


Boating for over 25 years, some of them successfully.
Reply With Quote Quick reply to this message Share with Facebook
  #5  
Old 10-10-2013
Faster's Avatar
Just another Moderator
 
Join Date: Sep 2005
Location: New Westminster, BC
Posts: 15,160
Thanks: 83
Thanked 235 Times in 227 Posts
Rep Power: 10
Faster has a spectacular aura about Faster has a spectacular aura about Faster has a spectacular aura about
Re: How can I identify the waterline from inside?

Quote:
Originally Posted by Seaduction View Post
Attach a "water level" to an underwater thru hull fitting.
A long piece of soft transparent tubing (tygon) temporarily attached to any open through hull with the end carefully held above the waterline would flood to the same height... should work!
__________________
Ron

1984 Fast/Nicholson 345 "FastForward"

".. there is much you could do at sea with common sense.. and very little you could do without it.."
Capt G E Ericson (from "The Cruel Sea" by Nicholas Monsarrat)
Reply With Quote Quick reply to this message Share with Facebook
  #6  
Old 10-10-2013
mad_machine's Avatar
Sea Sprite 23 #110 (20)
 
Join Date: Dec 2012
Location: Atlantic City, NJ
Posts: 3,187
Thanks: 5
Thanked 69 Times in 60 Posts
Rep Power: 2
mad_machine is on a distinguished road
Re: How can I identify the waterline from inside?

not only that.. but as long as the majority of the hose were kept beneath the waterline.. you could use it anywhere aboard as water will -always- seek it's own level
__________________
Art Haberland
__________________

In the end all that matters is how fully you loved, how gently you lived, and how gracefully you let go of things that did not belong to you -Buddha

__________________

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
  #7  
Old 10-10-2013
ericb760's Avatar
Been there, done that...
 
Join Date: Apr 2012
Location: Poway, CA
Posts: 1,302
Thanks: 12
Thanked 11 Times in 11 Posts
Rep Power: 3
ericb760 is on a distinguished road
Re: How can I identify the waterline from inside?

I think post #2 will get me close enough, I was just wondering if there was some old mariners trick to it. Thanks for all the suggestions...
__________________
1969 S&S Yankee Dolphin 24 "Avri Ellis"
Reply With Quote Quick reply to this message Share with Facebook
  #8  
Old 10-11-2013
minnow1193's Avatar
Senior Member
 
Join Date: Dec 2011
Location: Apollo Beach, Fl
Posts: 208
Thanks: 3
Thanked 3 Times in 3 Posts
Rep Power: 3
minnow1193 is on a distinguished road
I win!
Reply With Quote Quick reply to this message Share with Facebook
  #9  
Old 10-11-2013
Senior Member
 
Join Date: Oct 2011
Posts: 1,354
Thanks: 6
Thanked 24 Times in 24 Posts
Rep Power: 4
Seaduction is on a distinguished road
Re: How can I identify the waterline from inside?

Quote:
Originally Posted by Faster View Post
A long piece of soft transparent tubing (tygon) temporarily attached to any open through hull with the end carefully held above the waterline would flood to the same height... should work!
Correct. That is a water level.
Reply With Quote Quick reply to this message Share with Facebook
  #10  
Old 10-11-2013
Barquito's Avatar
Barquito
 
Join Date: Dec 2007
Location: Madison, WI
Posts: 2,048
Thanks: 0
Thanked 17 Times in 17 Posts
Rep Power: 7
Barquito is on a distinguished road
Re: How can I identify the waterline from inside?

So, I take it that my idea of: drilling a series of holes from the top down until water starts streaming in... is not going to win?
__________________
Bristol 27
Cirque
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
Low waterline jamesjle Gear & Maintenance 2 07-28-2013 02:52 AM
How do you measure the waterline boatingcruising General Discussion (sailing related) 12 07-27-2012 07:11 PM
Sealant for below the waterline... sailhog Gear & Maintenance 4 03-01-2010 06:41 PM
Waterline Ronbye Gear & Maintenance 7 05-16-2006 07:19 AM
LP below waterline? birdboat Gear & Maintenance 1 01-21-2003 03:22 PM


All times are GMT -4. The time now is 11:08 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.