|국가/구분||United States(US) Patent 등록|
|국제특허분류(IPC7판)||B64C-011/24 B32B-017/04 B32B-031/02|
|미국특허분류(USC)||156/156 ; 156/173 ; 156/189 ; 156/245|
|발명자 / 주소|
|출원인 / 주소|
|인용정보||피인용 횟수 : 29 인용 특허 : 2|
A method of making hollow aircraft rotor blades from laminated material. An expandable mandrel is first made from curable materials and then a composite build-up of epoxy material is made by layering a plurality of prepreg plies of curable material over the expandable mandrel. The mandrel and build-up of epoxy materials are then placed in a mold and pressure is applied to expand the mandrel which, in turn, expands the build-up of material against the mold. The mandrel and composite build-up of material are then cured and the mandrel becomes an integral p...
A method of making a section of a hollow aircraft rotor blade comprising the steps of: forming a hollow expandable mandrel by connecting an upper skin panel, a lower skin panel, a leading edge channel and an aft channel, said panels and channels being of resin reinforced curable materials which are cemented together, then laying a plurality of prepreg plies of curable material onto said hollow expandable mandrel to form a composite build-up, then placing said hollow expandable mandrel with said plurality of prepreg plies thereon in a female mold, then pl...