Increasing flotation - SailNet Community
 5Likes
Reply
 
LinkBack Thread Tools
post #1 of 26 Old 03-29-2013 Thread Starter
Junior Member
 
Join Date: Feb 2008
Posts: 8
Thanks: 1
Thanked 0 Times in 0 Posts
Rep Power: 0
 
Increasing flotation

I have a Neptune 24 made by Capital Yachts. My problem is that it rides really low in the rear and I would like to add some flotation to address this problem. My outboard is a Honda 8HP, so no excess weight there, and I have moved the batteries from their original location more forward to help. Is two part foam the best/only option to not lose any stowage? Do I need to cut open my liner to access the voids between? Any insight would be very helpful. Thanks.
mattnj is offline  
Quote Quick Reply Share with Facebook
Sponsored Links
Advertisement
 
post #2 of 26 Old 03-29-2013
Sea Sprite 23 #110 (20)
 
mad_machine's Avatar
 
Join Date: Dec 2012
Location: Atlantic City, NJ
Posts: 3,217
Thanks: 5
Thanked 69 Times in 60 Posts
Rep Power: 3
 
Re: Increasing flotation

you are saying she rides low.. so she is not riding on her lines?

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.
mad_machine is offline  
Quote Quick Reply Share with Facebook
post #3 of 26 Old 03-29-2013
Senior Member
 
Irunbird's Avatar
 
Join Date: Aug 2008
Location: Tampa, Fl
Posts: 319
Thanks: 8
Thanked 9 Times in 8 Posts
Rep Power: 7
 
Re: Increasing flotation

You're outboard really could be a major part of the problem. I know an 8 hp might not exacly be light, but could you take that off the mount and stow it below deck somewhere near the mast (assuming it's keel stepped)? My boat is similar displacement (maybe 400 lbs heavier) and we cruise with our 6 hp outboard on the transom, but would never consider racing that way-- it's significantly faster stored below. I don't see how it's possible to add foam anywhere (inside the hull) to alter the way the boat sits on her lines- you just have to move weight forward.

Last edited by Irunbird; 03-29-2013 at 09:02 PM.
Irunbird is online now  
Quote Quick Reply Share with Facebook
post #4 of 26 Old 03-29-2013
Master Mariner
 
capta's Avatar
 
Join Date: Jun 2011
Location: somewhere in the Windward or Leeward Islands
Posts: 2,191
Thanks: 34
Thanked 109 Times in 104 Posts
Rep Power: 5
 
Re: Increasing flotation

I don't believe floatation inside the hull would do anything to solve your problem. If you wanted to spend a small to mid-sized fortune in changing the boat to solve the problem, then you might try "micro-ballons" which are used by many racing boats to slightly alter trim and sailing characteristics.
A much cheaper and easier way to solve your problem might be to shift things around inside the boat (add an anchor and chain forward, stow heavier items forward; lighter stuff aft, etc.) until you have achieved the trim you desire.

"Any idiot can make a boat go; it takes a sailor to stop one." Spike Africa aboard the schooner Wanderer in Sausalito, Ca. 1964.

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

facebook.com/svskippingstone
Our Videos;

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


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


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
capta is offline  
Quote Quick Reply Share with Facebook
post #5 of 26 Old 03-29-2013
Senior Member
 
Join Date: Dec 2003
Posts: 1,461
Thanks: 1
Thanked 26 Times in 25 Posts
Rep Power: 12
 
Re: Increasing flotation

Foam heavier than air, fill voids (air) with foam to add floatation, I'm not seeing it.
capttb is online now  
Quote Quick Reply Share with Facebook
post #6 of 26 Old 03-29-2013
Junior member, rest old
 
msmith10's Avatar
 
Join Date: Feb 2009
Location: Columbus Ohio
Posts: 497
Thanks: 3
Thanked 0 Times in 0 Posts
Rep Power: 7
 
Re: Increasing flotation

Capta is correct in saying that adding foam inside won't alter the lines, in fact it would actually worsen it by adding more weight in the area where you actually want more displacement. Move weight forward .
jameswilson29 likes this.

Mark Smith
1977 C&C 30 Mk 1 hailing from Port Clinton, Ohio
msmith10 is offline  
Quote Quick Reply Share with Facebook
post #7 of 26 Old 03-29-2013
Senior Member
 
Join Date: Oct 2011
Location: Nanaimo B.C.
Posts: 2,518
Thanks: 3
Thanked 56 Times in 56 Posts
Rep Power: 4
 
Re: Increasing flotation

The foam in all the aft compartments prevent you from stowing anything in them thereby trimming the vessel. It's all about method.
Capt Len is offline  
Quote Quick Reply Share with Facebook
post #8 of 26 Old 03-30-2013 Thread Starter
Junior Member
 
Join Date: Feb 2008
Posts: 8
Thanks: 1
Thanked 0 Times in 0 Posts
Rep Power: 0
 
Re: Increasing flotation

Quote:
Originally Posted by mad_machine View Post
you are saying she rides low.. so she is not riding on her lines?
She rides below the water line in the stern. The boat has done this since new and is common with the Neptune's.
mattnj is offline  
Quote Quick Reply Share with Facebook
post #9 of 26 Old 03-30-2013 Thread Starter
Junior Member
 
Join Date: Feb 2008
Posts: 8
Thanks: 1
Thanked 0 Times in 0 Posts
Rep Power: 0
 
Re: Increasing flotation

Quote:
Originally Posted by Irunbird View Post
You're outboard really could be a major part of the problem. I know an 8 hp might not exacly be light, but could you take that off the mount and stow it below deck somewhere near the mast (assuming it's keel stepped)? My boat is similar displacement (maybe 400 lbs heavier) and we cruise with our 6 hp outboard on the transom, but would never consider racing that way-- it's significantly faster stored below. I don't see how it's possible to add foam anywhere (inside the hull) to alter the way the boat sits on her lines- you just have to move weight forward.
The boat is rated for a heavier outboard. It gets really pronounced when I have several crew in the cockpit. I moved my batteries forward, my water tank is in the bow, my head and holding tank, an oversized anchor, and a hundred feet of chain.
mattnj is offline  
Quote Quick Reply Share with Facebook
post #10 of 26 Old 03-30-2013
me at 67!
 
deniseO30's Avatar
 
Join Date: Nov 2006
Location: Bristol pa
Posts: 6,925
Thanks: 55
Thanked 125 Times in 114 Posts
Rep Power: 10
   
Re: Increasing flotation

Don't motor so fast. Sail more. I think you WILL notice a difference! Displacement hulls drop lower in the stern when being pushed near hull speed.

4 adults in the cockpit are an easy 600 + lbs!

Flotation cannot be increased without making the boat larger; the only way is to make it lighter.

Denise, Bristol PA, Oday 30. On Tidal Delaware River, Anchor Yacht Club.
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.


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

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


My boat is sold!

Last edited by deniseO30; 03-30-2013 at 04:52 PM.
deniseO30 is offline  
Quote Quick Reply 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:
OR

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
Show Printable Version Show Printable Version
Email this Page Email this Page



Similar Threads
Thread Thread Starter Forum Replies Last Post
Increasing purchase on cunningham and outhaul. zz4gta Gear & Maintenance 14 03-03-2009 10:09 AM
Thoughts on increasing the furling line size? labatt Gear & Maintenance 26 11-06-2008 07:52 AM
Winds 15 To 25 Mph. Gusts Up To 35 Mph...increasing To 45 Mph NewsReader Mass Bay Sailors 0 02-04-2007 05:15 PM
Increasing Sail Area dm567 General Discussion (sailing related) 33 01-18-2007 10:52 PM
Increasing the pace on Leg 5 @ Sail World Australia NewsReader News Feeds 0 04-10-2006 03:16 AM

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