Abstract: A tool core is disclosed for forming an opening in a composite structure. The composite structure comprises a structural core with inner and outer skins formed on a mandrel, sealed in an impervious fabric bag and cured at elevated temperature and pressure in an enclosed chamber. The tool core is formed by a tool core inner member of simi-rigid material enclosed in an inflatable elastic bag. The interior of the tool core bag is exposed to the elevated pressure of the closed chamber and therefor inflates during the curing process to conform the tool core precisely to the opening in the structural core.

Abstract: An aircraft structure for the minimization of microwave energy reflection from the aircraft back to a receiver. The provision of structural configurations and materials operate to reduce microwave energy reflection toward its source or another receiver located at a level below the aircraft and laterally or forward thereof.

Abstract: An aircraft structure for the minimization of microwave energy reflection from the aircraft back to a receiver. The provision of structural configurations and materials operate to reduce microwave energy reflection toward its source or another receiver located at a level below the aircraft and laterally or forward thereof.

Abstract: An aircraft structure for the minimization of microwave energy reflection from the aircraft back to a receiver. The provision of structural configurations and materials operate to reduce microwave energy reflection toward its source or another receiver located at a level below the aircraft and laterally or forward thereof.

Abstract: An aircraft structure for the minimization of microwave energy reflection from the aircraft back to a receiver. The provision of structural configurations and materials operate to reduce microwave energy reflection toward its source or another receiver located at a level below the aircraft and laterally or forward thereof.

Abstract: An aircraft structure for the minimization of microwave energy reflection from the aircraft back to a receiver. The provision of structural configurations and materials operate to reduce microwave energy reflection toward its source or another receiver located at a level below the aircraft and laterally or forward thereof.

Abstract: A resilient wheel is provided comprising a hub and web having a rim mated to and resiliently bonded to the web with an elastomeric adhesive. Depending on the application the outer circumference of the rim may have a flange machined into it so that it serves as the tire for the wheel or machined smooth to accept a separate tire. To prevent the rim from shifting relative to the web as the elastomeric adhesive ages, a plurality of locking pins are inserted through the rim and bond line into the web and bonded into place. The rim is thus effectively prevented from shifting even if the adhesive substantially or even totally disbonds from the mated parts. Several variants of these locking pins are possible to achieve improved economy for maintenance purposes or improved longevity of the wheel.