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composites vs. aluminum
I know this gets talked about all the time...but I have aquestion I was
hoping someone smarter than me could help me with. An aluminum evangelist showed me this link: http://www.aerotalk.com/myth_02.cfm The author asserts that: " The ratio of empty to gross weight is one of the most telling measures of structural efficiency. The equations are basic:EMPTY WEIGHT + PAYLOAD = GROSS WEIGHT Reduce empty weight by 100 lbs and the pilot can load an extra 100 lbs of payload, fuel/ baggage/ people. EMPTY WEIGHT/GROSS WEIGHT = WEIGHT EFFICIENCY RATIO The lower the ratio, the more efficient the design." He goes on to use this determination of strength/weight (or, structural efficiency) to determine that composites do not offer a greater strength/weight ration in airframe construction applications. But then I read about the new 7E7, which is a largely composite aircraft, thus lighter, thus more efficient. How do I reconcile these conflicting pieces of information? |
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