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Wing Tips

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ddsyverson(at)comcast.net
Guest

Posted: Sun Mar 12, 2006 5:39 pm Post subject: Wing Tips

Good evening folks,



I have a question on the wingtips supplied by Skystar in 2004. Does anyone 

know what kind of resin they used in the fiberglass wingtips - polyester or 

epoxy? I am guessing polyester, but am curious to know for sure because I 

will be doing some modification and want to keep the chemical compatibility 

issues organized.



Thanks,



Dave S

St Paul; MN

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lcfitt(at)sbcglobal.net
Guest

Posted: Sun Mar 12, 2006 6:33 pm Post subject: Wing Tips

Dave,



I don't think there will be a compatibilty issue as long as the new resin is 

epoxy.  From the smell of the various parts in the Lancair project as they 

are cut and worked, they use both  We just did the wing tips and they are 

polyester over gell coat..  And the resin used in all cases is epoxy.



Epoxy has at least one major advantage in that it doesn't need two types - 

the bonding type and the finish type with the surfacing wax.  The cure of 

Polyester resin is oxygen inhibited and you need an air barrier in the 

finish resin - the wax.  You will get a very hard sandable surface with 

epoxy laminating resins.



Lowell



---

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Richard Rabbers

Joined: 09 Jan 2006
Posts: 114
Location: Benton Harbor, MI - USA

Posted: Mon Mar 13, 2006 5:58 am Post subject: Re: Wing Tips

SV Michel's quote> ....polyester or epoxy ...there is no problem mixing them. 



I had the understanding that epoxy can be applied over polyester but not the opposite.  ('can' might not be the right word to use here..)



Keep in mind - I haven't dome much fibre glassing for a long time



Regards,

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_________________
Richard in SW Michigan
Model 1 / 618 - full-lotus floats (restoration)

Richard Rabbers

Joined: 09 Jan 2006
Posts: 114
Location: Benton Harbor, MI - USA

Posted: Mon Mar 13, 2006 7:40 am Post subject: Re: Wing Tips

I believe that Michel and I have the same opinion.

Epoxy bonds well to Polyester.



I felt bad sending a note without any footnote so checked a bit and found a couple references to support my understanding of the two resins.



(SV) Michel quote >> I believe epoxy will bond on anything. 



http://www.redrockstore.com/resin.htm



….. Epoxy resin will bond dissimilar or already-cured materials which makes repair work that is  very reliable and strong.  Epoxy actually bonds to all sorts of fibers very well and also offers excellent results in repair-ability when it is used to bond two different materials together…



….. Polyester resin is the cheapest resin available in the marine industry and offers the poorest adhesion, has the highest water absorption, highest shrinkage, and high VOC's.  Polyester resin is only compatible with fiberglass fibers and is best suited to building things that are not weight sensitive.  It is also not tough and fractures easily. Polyesters tend to end up with micro-cracks and are tough to re-bond and suffer from osmotic blistering when untreated by an epoxy resin barrier to water……



Vinylester resins – ( also included in this page – come somewhere between the two.)



Summary - Epoxy resin has far more to offer in its ability to flex, prevent delamination, and ease of use for repair work. Using epoxy resin leads to better quality products



http://www.masepoxies.com/aboutresins.htm



Michel - I am also a sailor - 1936 Spanish built wooden cutter rig. 

No glass involved but the prevous owner left a small tube of Araldit on board.  (I've not seen in it in US or Caribbean....though I haven't been looking either)



Richard

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Richard in SW Michigan
Model 1 / 618 - full-lotus floats (restoration)

Michel

Joined: 10 Jan 2006
Posts: 966
Location: Norway

Posted: Mon Mar 13, 2006 2:22 pm Post subject: Wing Tips

On Mar 13, 2006, at 4:40 PM, Richard Rabbers wrote:

 	  Quote: 	
		   Michel - I am also a sailor - 1936 Spanish built wooden cutter rig.



1936? That's funny, Richard! I owned a 25 feet Cornish gaff-rigged 
	


cutter (actually, a Falmouth quay punt) that was built in 1936, 

pitchpine on oak frames. Here is a photo of her, taken 31 years ago, 

when I sailed from Spain to Norway and got caught in a nasty squall 

line off the Portuguese coast. It tore apart my jib. The picture was 

taken in Villana do Castello.



http://home.online.no/~michel/tmp/Foxtrot.jpg



Cheers,

Michel



do not archive

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Kitfox 3 - Jabiru 2200

DPREMGOOD(at)aol.com
Guest

Posted: Mon Mar 13, 2006 5:24 pm Post subject: Wing Tips

Dave,



I installed Nav. light standoffs to my wingtips and used polyester resin to 

hold them in place. No problems as yet.



Doug Remoundos

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Richard Rabbers

Joined: 09 Jan 2006
Posts: 114
Location: Benton Harbor, MI - USA

Posted: Mon Mar 13, 2006 8:34 pm Post subject: Re: Wing Tips

 	  Michel wrote: 	
		  On Mar 13, 2006, at 4:40 PM, Richard Rabbers wrote:



1936? That's funny, Richard! I owned a 25 feet Cornish gaff-rigged 

cutter 	
 



Nice boat Michel! - flying / sailing is a good mix. When I started flying I considered it cheating - going to weather was too easy!.... obviously nothing is easy, it's all relative.  I've let a few years go by without enough of either but look forward to alot more of both soon.

- my boat photos are not digital - I'll send a shot sometime. She's a canoe stern double ender, copper riveted iroko on oak.



Regards,



Do not archive

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Richard in SW Michigan
Model 1 / 618 - full-lotus floats (restoration)

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