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#1
March 29th 07, 11:20 PM
posted to rec.aviation.owning,rec.aviation.homebuilt
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Hershey bar wing vs composite wing - how much drag?
DR wrote:
Hi, I don't see why a composite should be heavier: For carbon composite, the Young's modulus is ~70GPa for a density of 1.3 g/cm3. Al has the same Young's modulus but twice the density (2.7 g/cm3). For glass the strength is about half but again the weight is halved too -so it's not a gain over Al. I think the composites excel in their lack of rivets and joining pieces tho... Last I knew, Young's modulus was a measure of stiffness, not strength. Matt 
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