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Recently, development of long endurance electric powered airplane has been conductedworldwidely. Light structural weight of a main wing with sufficient structural integrity isessential for long endurance flight. Since a main wing with a slender spar can occurcatastrophic fracture under the flight, it is important to establish a design and verificationmethod for both the weight reduction and structural integrity. In this paper, structuraldesign and analysis of the main wing of HALE UAV with tubular spar reinforced with abulkhead were introduced. The static strength test of the main wing was performed toverify structural integrity under the static load. Then, the experimental result was comparedwith an analytical result from a finite element analysis. It was concluded that the developedlight weight main wing would have sufficient structural integrity under the flight operation.