SailNet Community - Reply to Topic

   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 > Boat Review and Purchase Forum > Airex Cored Decks
 Not a Member? 


Thread: Airex Cored Decks Reply to Thread
Title:
  

By choosing to post the reply below you agree to the rules you agreed to when joining Sailnet.
Click Here to view those rules.

Message:
Trackback:
Send Trackbacks to (Separate multiple URLs with spaces) :
Post Icons
You may choose an icon for your message from the following list:
 

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.



Click here to view the posting rules you are bound to when clicking the
'Submit Reply' button below


Additional Options
Miscellaneous Options

Click here to view the posting rules you are bound to when clicking the
'Submit Reply' button below


Topic Review (Newest First)
08-06-2006 11:07 PM
sailingdog The deck and topsides were navy blue. It was pretty brutal weather, about 98 degrees and very sunny, and had been for about a week or so when the foot prints happened. The crew member in question is about 300 lbs. and 6' 5" or so, and was carrying a 100 liter cooler at the time. However, I don't believe the boat was cored with Airex specifically. I do know it was cored with foam though, as I had been working on installing a new winch earlier in the week.
08-06-2006 09:57 PM
CBinVA Thanks to Dewey and sailingdog for the prompt and informative replies.

Dewey- Unfortunately, we liked the KP46 very much. I say "unfortunately", because it is significantly more $$$ than we want to spend. (Silly us, we had to go look.) I'm also concerned about the draft, which I'm sure works just fine in the deep Pacific, but we're more interested in the Atlantic. It's all about compromises, of course. What's one more year of work?:-)

sailingdog - Did this boat with the footprints have a navy blue deck or just the hull? Was it unusually hot weather, or a standard island sunny day?

Thanks for your time and thoughts.
08-06-2006 08:55 PM
sailingdog Most of the Ureathane-foams can lose significant amounts of strength when they heat up...however, as far as I recall, the strength loss is not permanent—however the deformation may be. I would highly recommend that you paint any foam-cored boat a light color, as most of the foam lose strength at temperatures far lower than end grain balsa, which is still IMHO a superior core material.

Foam as a core material has some strong disadvantages over end-grain balsa. Water tends to migrate along foam cores relatively easily, plywood cores have the same problem. Balsa cores tend to resist water migration. Foam can also have bonding issues with the laminates on either side, as the foam does not wick the resin and create a strong bond, as does end-grain balsa. Also, most foam core materials have a much lower shear resistance than end-grain balsa. Lastly, most of the foam core materials have a much lower deformation temperature than end-grain balsa.

I have been on boats with foam-cored decks, where there were foot prints left in the glass when the glass was very hot from exposure to the sun and then walked on by a very large crew member. This boat was a fairly dark navy blue however. I don't know if the same thing would happen to a white boat under the same circumstances.

Plywood is an inferior core material as it does not have the advantages of either balsa or foam. It wicks water along the core, can have the bond formation problems of foam, and is significantly heavier than either. However, it is an excellent core material for areas under heavy loads, as it resists compression loads and shearing loads far better than either the foams or balsa.

However, the foam cored boats have a few significant advantages over balsa-cored boats. One, they're usually lighter. Two, foam cores resist rot. Three, in some cases, the foam core materials can be cheaper than balsa.
08-06-2006 08:35 PM
Dewey Benson Airex core is pretty good stuff. It is relativly good at NOT absorbing water (it is not completley water tite however). The same procedures for examining balsa core can be applied to airex core. IE: whacking the snot out of the laminate with a rubber mallet to find delamination. This ia a good job for a competent marine surveyor.

I have not seen heat related softening due to high temps and I have seen a number of vessels return for the south Pacific. This doesnt mean this can't happen. I have seen delamination due to impact stress in airex cored hulls, and rarely (but have seen it) seen water intrusion making the hul spongy.

I have not heard of any major deck problems endemic to the KP 46. This vessel was built at the queen long yard and was a serious upgrade from the origional 44. If I recall correctly the 83 was one of the early 46's built.

If you really are considering the vessel, get someone heavy to walk around on the deck, if you don't notice any springy spots the vessel (other than other obvious problems) would be worth a survey.

The KP 46 sails very well indeed and you should find it a comfortable craft. The joiner work from the queen long yard really sets it apart from the earlier 44 and the streched 44 (Spindrift 46).

Dewey
08-06-2006 06:41 PM
CBinVA
Airex Cored Decks

My husband and I recently looked at a 1983 Kelly Peterson 46. According to the old brochure, it has an Airex cored deck. Originally, an Airex core seemed a real advantage over a balsa or plywood core, since foam doesn't rot. However, doing a little research, I've seen a couple of negative comments that said that Airex can get spongy in hot climates. Furthermore, it's not clear to me that "spongy" foam would ever really return to its original strength. Anybody got any experience and/or knowledge of Airex cored decks they'd care to share?

CBinVA

 
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


All times are GMT -4. The time now is 02:46 AM.

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.