Cruisers Forum
 


Join CruisersForum Today

Reply
 
Thread Tools Rate Thread Display Modes
Old 20-11-2012, 16:53   #16
Senior Cruiser
 
SkiprJohn's Avatar

Cruisers Forum Supporter

Join Date: May 2006
Location: Kea'au, Big Island, Hawaii
Boat: Cascade, Sloop, 42 - "Casual"
Posts: 14,192
Re: Purpose Of The Marked Waterline

Yes, the designers put the waterline where a boat's loaded balance is best.

If you keep readjusting your waterline due to more equipment aboard you are not doing yourself any favors as far as performance goes. Cruisers often overload at first and eat their way to the designed waterline.

When I see boats on their moorings and notice that their waterline indicates they are down by the bow or stern I call them to let them know their boat might be flooding (if I know their phone numbers). Good thing to do each time you look out on your boat is to take note of where the waterline is sitting.

kind regards,
__________________

__________________
John
SkiprJohn is offline   Reply With Quote
Old 20-11-2012, 16:58   #17
Registered User
 
Capt Phil's Avatar

Join Date: Jun 2010
Location: Stateline NV
Boat: Prior boats: Transpac 49; DeFever 54
Posts: 2,749
Re: Purpose Of The Marked Waterline

Great advice, SkiprJohn... +1! Phil
__________________

__________________
Capt Phil is offline   Reply With Quote
Old 20-11-2012, 16:58   #18
Marine Service Provider

Join Date: Jan 2011
Location: Eldean Shipyard, Holland, MI
Boat: 1977 Pearson 30
Posts: 113
Re: purpose of the marked waterline

Quote:
Originally Posted by Don Lucas View Post
I always figure it was so anyone driving by your boat could quickly tell whether your boat was sinking!
Based on where we are at, we use it to determine if it is setting on the bottom and if so, by how much!
__________________
Anonymous7500 is offline   Reply With Quote
Old 20-11-2012, 18:29   #19
Registered User
 
SVTatia's Avatar

Join Date: Jul 2007
Location: Toronto, Canada
Boat: Luders 33 - hull 23
Posts: 815
Re: Purpose Of The Marked Waterline

Things to keep in mind:

If your boat is empty and tanks (water, fuel, holding) are empty, the waterline will be higher.
If the boat is in fresh water the waterline will be lower.
Know the pounds per inches of immersion of your boat - a calculated value given by the designer - so for n amount of weight your boat will sink n inches.
__________________
SVTatia is online now   Reply With Quote
Old 21-11-2012, 00:38   #20
Moderator
 
carstenb's Avatar

Cruisers Forum Supporter

Join Date: May 2012
Location: Copenhagen
Boat: Jeanneau Sun Fast 40.3
Posts: 4,936
Images: 1
Re: Purpose Of The Marked Waterline

There is a very good reason why you have to learn all the trim calculations when you take a yachtmaster ocean.
__________________
I spent most of my money on Booze, Broads and Boats. The rest I wasted - Elmore Leonard
carstenb is offline   Reply With Quote
Old 21-11-2012, 00:48   #21
Registered User
 
markpierce's Avatar

Join Date: Aug 2010
Location: Central California
Boat: M/V Carquinez Coot
Posts: 3,413
Re: Purpose Of The Marked Waterline

It helps to show whether one's boat is balanced, both fore-and-aft and starboard-port. Here I'm leaning to starboard as I hadn't completed transferring fuel among the four fuel tanks after filling starboard tanks.

__________________
markpierce is offline   Reply With Quote
Old 21-11-2012, 07:36   #22
Registered User

Join Date: Mar 2008
Location: Akron, Ohio
Boat: Bristol 29(1967)
Posts: 595
Re: Purpose Of The Marked Waterline

Thanks SkiprJohn

I do have two tanks(total of about 35 gallons) in the bow area that are presently empty(have been empty for years), which explains the bow riding high. Come spring I'll see if that additional weight brings the boat back onto the painted waterline.
__________________
SURV69 is offline   Reply With Quote
Old 21-11-2012, 10:44   #23
Registered User
 
SVTatia's Avatar

Join Date: Jul 2007
Location: Toronto, Canada
Boat: Luders 33 - hull 23
Posts: 815
Re: Purpose Of The Marked Waterline

Quote:
Originally Posted by SURV69 View Post
Thanks SkiprJohn

I do have two tanks(total of about 35 gallons) in the bow area that are presently empty(have been empty for years), which explains the bow riding high. Come spring I'll see if that additional weight brings the boat back onto the painted waterline.
If that works and you don't need the tanks - assuming its water - you can add trim ballast - about 300 pounds.
__________________

__________________
SVTatia is online now   Reply With Quote
Reply

Thread Tools
Display Modes Rate This Thread
Rate This Thread:

Posting Rules
You may not post new threads
You may not 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 Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Raising Waterline swisscraft Construction, Maintenance & Refit 6 26-06-2012 10:26
Blisters above waterline anjolain Monohull Sailboats 14 10-04-2012 12:57
Route from USA (LA) to Australia (Sydney) with the Purpose of Surfing timbodreamer Navigation 4 21-11-2011 21:48
Bilge Pump Discharge at Waterline sandycohen Plumbing Systems and Fixtures 15 26-07-2011 09:23



Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -7. The time now is 13:54.


Google+
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.
Social Knowledge Networks
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.

ShowCase vBulletin Plugins by Drive Thru Online, Inc.