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Composites take off… in some civil helicopters

机译:复合材料起飞……在某些民用直升机中

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摘要

Helicopter manufacturers have long recognized the benefits of composites in critical aircraft components. In today's military rotorcraft, composites regularly constitute 50 to 80 percent -- or more -- of the airframe by weight. But in helicopters built for the civil aviation sector, composite application varies much more widely. Some manufacturers draw heavily on their experiences with military rotorcraft and make significant use of composites. Others employ composites only in specialized or nonstructural components or those for which metals are impractical and/or cost-prohibitive. In the following survey of major manufacturers, some variation can be attributed, in part, to differences in experience and manufacturing philosophy. However, several attribute their reluctance to expand composite use in rotorcraft to certification rules recently rewritten by the Federal Aviation Admin. (FAA), whose more stringent requirements for composites inflate costs and overtax the smaller R&D budgets available for some commercial applications.
机译:直升机制造商早已认识到复合材料在飞机关键部件中的优势。在当今的军用旋翼飞机中,复合材料通常占机身重量的50%至80%-甚至更多。但是在为民航业制造的直升机中,复合材料的应用变化很大。一些制造商大量借鉴了他们在军用旋翼机上的经验,并大量使用了复合材料。其他人仅在特殊的或非结构性的组件中使用复合材料,或者在金属不实用和/或禁止成本的组件中使用复合材料。在下面对主要制造商的调查中,某些差异可以部分归因于经验和制造理念的差异。但是,有一些人将其不愿将旋翼飞机上的复合材料用途扩大的原因归因于联邦航空局最近重新制定的认证规则。 (FAA),其对复合材料的更严格要求增加了成本,并使某些商业应用可用的较小的研发预算超出了税率。

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