How dry is too dry? - Page 2 - 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? 
  #11  
Old 10-10-2008
Faster's Avatar
Just another Moderator
 
Join Date: Sep 2005
Location: New Westminster, BC
Posts: 14,678
Thanks: 68
Thanked 194 Times in 186 Posts
Rep Power: 10
Faster has a spectacular aura about Faster has a spectacular aura about Faster has a spectacular aura about
Quote:
Originally Posted by jrd22 View Post
Faster- when you get the boat to 30% RH, would you let me know? I want to move into it as I'm getting a little moldy and mildewy myself lately. Thanks, I knew you would understand.

John
Sure John... we can meet at Roche Harbor and we'll do the swap
__________________
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 Share with Facebook
  #12  
Old 10-10-2008
Member
 
Join Date: Jan 2007
Posts: 86
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 8
VASailor10 is on a distinguished road
A dry boat is a happy boat. I dont think your really in danger of harming anything when you use a dehumidifier. Are you a liveaboard?

-Spencer
__________________
Surprise
Catalina 22
Reply With Quote Share with Facebook
  #13  
Old 10-10-2008
Faster's Avatar
Just another Moderator
 
Join Date: Sep 2005
Location: New Westminster, BC
Posts: 14,678
Thanks: 68
Thanked 194 Times in 186 Posts
Rep Power: 10
Faster has a spectacular aura about Faster has a spectacular aura about Faster has a spectacular aura about
Quote:
Originally Posted by VASailor10 View Post
A dry boat is a happy boat. I dont think your really in danger of harming anything when you use a dehumidifier. Are you a liveaboard?

-Spencer
Not a liveaboard.. so that's why the "comfort" aspect (eg 50-60%RH) is not a concern.. We have dorade vents for ventilation, so as Cameron mentioned there's going to be a limit to how dry things will get, so I think we're OK to run it full time. It's already made a difference to the normal off season feel of the boat so we're pleased at this point.

Thanks everyone.
__________________
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 Share with Facebook
  #14  
Old 10-10-2008
RAGTIMEDON's Avatar
Senior Member
 
Join Date: Apr 2007
Location: St Peters, MO
Posts: 389
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 8
RAGTIMEDON is on a distinguished road
Too dry is when the water level gets below 5 feet and my keel drags!
__________________
Don
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

1980 Endeavour 37 sloop, currently in the Mississippi near St Louis
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
Reply With Quote Share with Facebook
  #15  
Old 10-10-2008
mikehoyt's Avatar
Senior Member
 
Join Date: Nov 2000
Posts: 675
Thanks: 0
Thanked 1 Time in 1 Post
Rep Power: 14
mikehoyt is on a distinguished road
Our J boat gets very wet inside when racing in the rain and dousing chute, changing sails etc. Another boat I sail on - Peterson 37 has dehumidifier plugegdin when not sailing. I plan to do same next summer to dry out boat between sailing and then move to dock box when sailing. This just to dry out boat from rain ....

What are those West Marine devices earlier in this thread?

Mike
Nut Case
J27 #150
Reply With Quote Share with Facebook
  #16  
Old 10-11-2008
Owner, Green Bay Packers
 
Join Date: Sep 2006
Location: SW Michigan
Posts: 10,318
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 12
sailaway21 is just really nice sailaway21 is just really nice sailaway21 is just really nice sailaway21 is just really nice
Faster,
One concern you will have at lower levels of humidity can be any wet cell batteries on board. If you keep the humidity artificially low, and 30% is pretty low-depending upon the temperature, you can slowly evaporate the water out of any wet cell batteries. This is a problem often observed when continuously storing batteries in an A/C environment as well.
Reply With Quote Share with Facebook
  #17  
Old 10-11-2008
Faster's Avatar
Just another Moderator
 
Join Date: Sep 2005
Location: New Westminster, BC
Posts: 14,678
Thanks: 68
Thanked 194 Times in 186 Posts
Rep Power: 10
Faster has a spectacular aura about Faster has a spectacular aura about Faster has a spectacular aura about
Quote:
Originally Posted by sailaway21 View Post
Faster,
One concern you will have at lower levels of humidity can be any wet cell batteries on board. If you keep the humidity artificially low, and 30% is pretty low-depending upon the temperature, you can slowly evaporate the water out of any wet cell batteries. This is a problem often observed when continuously storing batteries in an A/C environment as well.
Excellent point, Sway! Will keep a closer eye on the battery banks. Thanks much.
__________________
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 Share with Facebook
  #18  
Old 10-11-2008
bobmcgov's Avatar
baDumbumbum
 
Join Date: Jul 2007
Location: Windy Wyoming
Posts: 1,037
Thanks: 0
Thanked 25 Times in 24 Posts
Rep Power: 8
bobmcgov will become famous soon enough
Moisture cycling is hard on wood, joints, and veneers, but I dunno how big a problem that might be in this case. As wood swells and shrinks due to MC, it can undergo checking or delamination; drawers and doors may stick; and glue joints can fail. Hardware can come loose as it is levered out, and contact seals may lose weathertightness. Thirty percent minimum RH isn't all that awful, but much depends on your maximum RH relative to that and, crucially, length of each cycle. Wood absorbs and loses moisture slowly, often lagging several months behind ambient conditions.

The only sure way to monitor things is by measuring the internal MC of wood and panel products directly. If you expect, later, the boat interior to spend long periods at 90% humidity, I'd advise no lower than 50% to 60% now. The rate of loss or absorption increases with gradient, as does the potential for damage. If even your wet season is down around 70% RH, you can prolly dehumidify it to 30-35%.

I always give my hardwood at least a month to shake down before milling and joining it, as it may come from states at 80% humidity and Wyoming is currently running ... 17%, according to the meter on the wall. That can represent 6 points internal moisture content in wood products, or roughly 1/4" of shrinkage across a 12" maple board (flatsawn). Yikes!

One last concern: dehumidifiers drawn tons of power, as they are just reefers turned inside out and they cycle constantly. Older ones were pretty solid, but new Box Store units burn up with depressing frequency. Me mum goes thru one every eighteen months in her basement. When the compressors do kick it, they can drawn a mighty surge of amps. Make sure your power cord is sized for 'angry motor having meltdown.'
__________________
Buccaneer18, Grainnia
SJ21, Diarmuid
Albin Ballad 30, Fionn

Last edited by bobmcgov; 10-12-2008 at 10:34 PM.
Reply With Quote Share with Facebook
  #19  
Old 10-11-2008
hellosailor's Avatar
Plausible Deniability
 
Join Date: Apr 2006
Posts: 10,604
Thanks: 2
Thanked 87 Times in 85 Posts
Rep Power: 10
hellosailor has a spectacular aura about hellosailor has a spectacular aura about
Faster, IIRC the USN standard aboard nuclear submarines is still the same 74F 45%RHI that they set when they first started looking into how to keep crews sealed up for 90 days at a clip. That's partly from a comfort level, i.e. so you can be in shirtsleeves and still feel awake not cold.

I'm not sure how much I'd trust an RHI meter on a boat, after all, there's gobs of sea breeze drifting in all the time--unless you're on one of those 90-day tours. 40-45% should keep everyone including the boat happy, but if you like it a little drier...I can't see that would hurt. See what kind of compromise you can strike with your heater as it gets colder.
Reply With Quote Share with Facebook
  #20  
Old 10-11-2008
Stillraining's Avatar
Handsome devil
 
Join Date: Jan 2008
Location: LaConner,Washington
Posts: 3,477
Thanks: 0
Thanked 1 Time in 1 Post
Rep Power: 9
Stillraining is a jewel in the rough Stillraining is a jewel in the rough Stillraining is a jewel in the rough
isn't there is a huge storage facility for aircraft in the desert where the humidity stays around 10 %? also in furniture building you want your wood well below that level even so I fail to see how this would hurt a thing..Ill gander a guess that the wood used in boat construction is below 7% moisture content..IMHO

Edit; Bob sounds like your a wood worker too..any tricks on stabilizing Madrona.

Last edited by Stillraining; 10-11-2008 at 08:03 PM.
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
Dry Ice mman30 General Discussion (sailing related) 16 09-13-2008 01:10 AM
How to dry clothes at Sea? Traveling_Jim Cruising & Liveaboard Forum 12 04-22-2006 07:39 AM
dry rot repairs jsutor Gear & Maintenance 0 10-13-2004 03:41 AM
Using Dry Ice Sue & Larry Gear and Maintenance Articles 0 09-02-2001 08:00 PM
Discovering the Dry Tortugas Sue & Larry Cruising Articles 0 03-12-2000 07:00 PM


All times are GMT -4. The time now is 12:49 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.