Earlier efforts accomplished under the original contract work statement showed that efficient turbofan propulsion systems could be designed for and extended successfully to smaller and lower speed civil airplanes than have been considered heretofore. This follow-on study by NASA-Ames and AiResearch expands that work to include the application of these small turbofan concepts to military trainer airplanes, and to establish the potential for commonality between civil and military engines.nThe principal conclusion drawn from the results of this investigation is that a turbofan propulsion system for a small civil aircraft is also applicable to military trainer airplanes. Aircraft designed with these engines to meet military require?ments for basic trainers are smaller, less costly and more effi?cient than existing basic trainer aircraft or basic trainer air?craft that have been conceptually designed with high subsonic turbojets or turbofans. In addition, substantial benefits may accrue to both military and civil sectors if this commonality is exploited.
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