Cruisers Forum

Join CruisersForum Today

Thread Tools Rate Thread Display Modes
Old 10-08-2009, 17:33   #1
Marine Service Provider
witzgall's Avatar

Join Date: Oct 2006
Location: Eastern Shore, MD
Boat: Camper Nicholson 44 Ketch
Posts: 1,801
Keeping Level Fore 'n Aft

Hi all;

This weekend, we filled up the tanks and went cruising for the first time since we finished the install of our arch with solar panels. The arch is aluminum, so weighs perhaps 40-50 lbs. The panels are maybe that again as well.

Our fuel (20gal) and water tanks (30gal) are directly underneath the cockpit sole, behind the engine. The lazerette has stuff in it, maybe another 100 lbs total, plus an eight gallon hot water heater. There is also a fridge compressor, maybe 25 lbs.

The boat is now at least 1 inch, maybe almost two inches lower at the transom than the bow. I have plans for some other stuff back there, but now I am a bit hesitant to do anything more. I want to add more water capacity, my first choice would be under the setees. I could also add it up in the bow underneath the v-berth, but I don't want a pitching boat!!

Her design weight is 10k lbs. Just how much weight on top of the "bare" boat with can I expect to put in the bow/stern, before the motion is affected enough to be noticed, or a problem? She has a 4200 lbs fin keel, if that helps.


witzgall is offline   Reply With Quote
Old 10-08-2009, 21:05   #2
Moderator Emeritus
Ex-Calif's Avatar

Cruisers Forum Supporter

Join Date: May 2007
Location: Ohio
Boat: Now boatless :-(
Posts: 11,525
Images: 4
Do you have the anchors and chain on board? Sounds like you ae going to have to plan for significant storage up front.

Dry stores, sails, tools and hardware come to mind.

Obviously it is ideal to mass the weight in the middle of the boat but that's just not always practical.

Relax Lah! is SOLD! <--- Click
Click--> Custom CF Google Search or CF Rules
You're gonna need a bigger boat... - Martin Brody
Ex-Calif is offline   Reply With Quote
Old 10-08-2009, 22:13   #3
CF Adviser
Pelagic's Avatar

Cruisers Forum Supporter

Join Date: Oct 2007
Boat: Van Helleman Schooner 65ft StarGazer
Posts: 7,321
In basic static stability, you are dealing with calculations based on the given design characteristics of your boat

TPCN (Tones per Centimeter Immersion)
CG…Centre of gravity
PP… Pivotal Point

Rather than getting into all of that, a practical and easy test is to use some large garbage buckets, measure or weigh them full of water and play with Changing your trim within your present condition by moving them to different realistic positions and refilling.

This gives you the amount of weight and optimum position; you need to move weight forward down below to improve the trim.

Make a spreadsheet when you measure it with full crew and full tanks simulated on board and then when you are close to even trim, make a note of “bodily sinkage” (Your new draft)

On your size of boat, stuff like this can change the boat’s trim and performance very easily, so putting extra water up forward or shifting house batteries more forward will help, but do simple tests first with water jugs under the v-berth first, go sailing in some weather to get a feel of what all this added weight does to handling, before committing to a permanent solution.

You will have changed the “dynamic” stability and while it may feel a bit wetter, it is probably a compromise you will learn to accept.

Good luck!
Pelagic is online now   Reply With Quote
Old 11-08-2009, 07:49   #4
Marine Service Provider
witzgall's Avatar

Join Date: Oct 2006
Location: Eastern Shore, MD
Boat: Camper Nicholson 44 Ketch
Posts: 1,801
One thing I did not mention - we had maybe 40 feet of our 100' 5/6 chain out when I was in the water to notice the change. That may have had a significant effect? perhaps things are not as bad as I thought. The idea of using some moveable ballast to check thinks out makes sense.

Has anyone used one of those Plastimo or Vetus triangular shaped bladder tanks? The Plastimo can be had for ~$100. I am wondering out loud if the triangular tanks are any different than the others.

witzgall is offline   Reply With Quote

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
Antique 4' level repair dacust Construction, Maintenance & Refit 5 12-12-2008 06:48
Honda 25 oil level fla.sailor Engines and Propulsion Systems 6 02-06-2008 19:03
Rising Oil level 3QM30 svnakia Engines and Propulsion Systems 3 29-05-2008 15:36
Fractional Ownership at Another Level ssullivan Off Topic Forum 2 08-01-2007 18:15
Walker Bay fore & aft balance David W General Sailing Forum 1 13-05-2005 15:59

Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -7. The time now is 14:53.

Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2018, vBulletin Solutions, Inc.
Social Knowledge Networks
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2018, vBulletin Solutions, Inc.

ShowCase vBulletin Plugins by Drive Thru Online, Inc.