Which Foam for Hull Core?
Printed From: Yachts and Yachting Online
Category: Dinghy classes
Forum Name: Dinghy development
Forum Discription: The latest moves in the dinghy market
URL: http://www.yachtsandyachting.com/forum/forum_posts.asp?TID=1711
Printed Date: 15 Aug 25 at 7:26pm
Software Version: Web Wiz Forums 9.665y - http://www.webwizforums.com
Topic: Which Foam for Hull Core?
Posted By: Chew my RS
Subject: Which Foam for Hull Core?
Date Posted: 03 May 06 at 12:30pm
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Has anyone got any recommendations for which foam to use as a hull core for a 14ft dinghy? The choice seems to come down to PVC foam from Divinycell, Airex or Klegecell or a SAN foam from SP Systems (Corecell). Are there others? Which would you recommend (and why)? Thanks. |
Replies:
Posted By: getafix
Date Posted: 03 May 06 at 4:27pm
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you could try http://www.cfsnet.co.uk/acatalog/CFS_Catalogue__FOAMS___CORE _MATERIALS_14.html or www.boatbuildingsupplies.com (or maybe .co.uk?) or call your friendly local boatbuilder ------------- Feeling sorry for vegans since it became the latest fad to claim you are one |
Posted By: Isis
Date Posted: 03 May 06 at 5:10pm
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Shameless plug for sponsor time... Give Wiz Deaz at Matrix Mouldings a bell... Youd have a hard time finding a more helpfull bloke to chat about stuff like this... What you chose will depend on the shape of the hull and the rest of the layup so its hard to give any specific advice without more info... whats the project? 0800 0744788 Wiz.Deas@mcmc-uk.com http://www.mcmc-uk.com/ - http://www.mcmc-uk.com/ ------------- |
Posted By: Chew my RS
Date Posted: 03 May 06 at 9:36pm
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Thanks for that. I've been reliably informed (by a Cherub self-builder) that Airex is the way to go as the pores are smaller and it is flexible without heating. Its a NS14, but still work in progress, especially above the waterline.
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Posted By: Isis
Date Posted: 03 May 06 at 9:57pm
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That looks pretty severely sexy! Is that all your own work? Impressed. Most of the mods on my boat are being built with airex (other than the snout sides which are something similar but more flexible - I forget the name) And it seems to be material of choice for most things in the cherub fleet. You could even go for something like nomex but there are quite a few issues accociated with that kinda construction (ie it breaking up if it gets saturated) ------------- |
Posted By: aardvark_issues
Date Posted: 04 May 06 at 8:40am
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Personally use Corecell, as moving to it from Divinycell saved quite a
bit of weight (at least 5 k's in a N12), mostly due to smaller pores
and soaking less resin. 90 kilo density is pretty easily available and fairly impact resistant for hulls and the like. Don't know if youve looked at N12 shapes before going with that NS shape, but it looks a lot like a stretched Feeling Foolish! Looks cool, keep us updated. |
Posted By: Skiffe
Date Posted: 04 May 06 at 8:49am
Looks a bit like an old Javilin hull. Sorry but it might be a bit fat. I think I still have the drawings for the first Tequila hull. If I do I'll send it to you. Are there any to race againts where you are or can you get some others? ------------- 12footers. The Only Way to FLY Remember Professionals built the titanic, Amateurs built the ark. |
Posted By: Chew my RS
Date Posted: 04 May 06 at 10:15am
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Thanks for the comments guys. I've not directly looked at any boat whilst designing this, but have studied the Merlin Rocket and (antipodean) Javelin websites. Also I guess my time sailing 200s and 400s must have influenced the lines. If it looks like a Feeling Foolish, it can't be so bad. Aardvark - have you ever used Airex? Your reasons for using Corecell are the same as the ones I was given for using Airex. Interesting to know how they compare. Skiffe, the Tequila drawings would be great if you've got them. There are no NS' as far as I know in the UK, so am doing this design blind. I just like the look of them and would like to sail one. I looked at importing an old one from Oz, but the cost of transport was too much, so figured I would make my own. Should be good to race against Merlin Rockets, N12s, RS2/400s etc. I think I'm right in saying that the hull rules for the NS and Javelin are very similar, hence the resemblance? As there are no others to race against, I don't mind sacrificing a bit of top end speed for controlability (but not too much!), but in what way fat? In the bow, at the stern, or all over? I won't take offence - all comments and constructive critisicm welcome. Cheers. |
Posted By: Skiffe
Date Posted: 04 May 06 at 11:25am
The Jav was the prototype hull for the NS14, if you are desgining a NS14 then get the rules, I think they are on the net. It looks fat all over. As for transport PM strawberry he is appaerentally getting 2 12's so space shouldn't be a problem. http://www.sailinganarchy.com/forums/index.php?showtopic=34456 - http://www.sailinganarchy.com/forums/index.php?showtopic=344 56
------------- 12footers. The Only Way to FLY Remember Professionals built the titanic, Amateurs built the ark. |
Posted By: aardvark_issues
Date Posted: 04 May 06 at 8:07pm
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Not used Airex I'm afriad, so cant comment... Might try and find some samples from somewhere to have a poke. I don't think the skiffs are for Stuberry! I'm not sure how they would look with a spice kite stuck on the front  |
Posted By: Isis
Date Posted: 04 May 06 at 8:22pm
The foam bits you sorted for me look/feel about the same as the airex ive got, what were they?
 That was a bit below the belt!!!------------- |
Posted By: aardvark_issues
Date Posted: 04 May 06 at 8:27pm
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Harsh but fair?! Foam bits were Corecel. Looking at various websites, Airex seems pretty similar... Go with what you can get hold of I reckon... |