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style of Glass Fabrics

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Albert80

Member
Joined
Jun 30, 2009
Messages
11
Location
Bologna, Italy
Hi Guys,
I have one questions...I know that there are many type of glass fabrics like S2-Glass E-Glass etc... that are the most used for airplane costruction. I have found (by RUTAN) the following E-Glass:
E-Glass style 7715 UNIDIRECTIONAL
E-Glass style 7725 BIDIRECTIONAL
My question is what are the difference between this two and the E-Glass syle 7781? The other two are one UNI (used for exemple for cap-spar) the otherone is BID (used for exemple for web-spar) and I know how it be used but I don't understand what kind of fibre is style 7781! is a UNI or BID and when and for what is used?

Thanks for you help
Albert
 
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