Russ,
I finally got a chance to sit down and say thanks for the link and thanks for taking the time to post all the information on your projects -- some really useful information there! I got some good reading on that one!
Kenny
--- In This email address is being protected from spambots. You need JavaScript enabled to view it., russell wilson wrote:
>
> hi george
>
> my dragon is ply,is covered...but is not painted on the out side or
> varnished on the inside.
> i am not the builder of mine.
> are you sure the carbon's plans call for varnish and paint?
>
> in relation to your material comparison...something does not seem right.
>
> bothe materials have two parts... resin/carbon and resin/wood
>
> fenolic resin has a density of 1.1..this is in your ply?red?
> are you using west system epoxy in your carbon sample?..density 1.3?
>
> your two samples are the same thickness and size right?
>
> carbon has a density of 1.8
> wood varies from .14 to over 1.0
>
> in each sample you can varie the persentage of the two parts that make each
> sample.
> and this will vary the density of each sample.
>
> if you have a carbon sample 0%carbon/100 %resin...this is as light as this
> combo can be(unless we foam it)
>
> if you have a ply sample(aircraft ply) 0% wood/100% resin...this is the
> heaviest this combo can be.
>
> hand lay up carbon/resin usally comes out at 50%/50%..dosent it?density
> 1.5?
> aircfaft ply looks like moor wood than resin to me..my guess is 80% wood 20%
> resin.with the wood density say .4 .5 .6 .7?
>
> if the wood laminate is 4 parts wood and one part resin it would have a
> density somewere between .5/.8
>
> see why im scratching my head ....thinking the diferance in weight between
> the ply and carbon....that you have put up... at orond 20% to 25%weight
> differance does not seem right?
> my thinking is it should be closer to a 50% weight diferance.
> it also dose not corespond with my testing/samples.
>
> kenny is also qoting that 0.4 mm thick carbon is slightly heavier than 0.8
> mm thick ply...for the entire leading edge skin...that is also close to a
> 50% differance in weight.
>
> is your carbon 6 oz cloth?and how many layers are you using?
> what type of ply/wood type?
> is there a chance the wood is wet?
> did you accidentally type 0.8mm carbon when you ment 0.4mm?
>
>
>
> russ.
