Abstract: A gas turbine engine drive shaft includes a tubular main shaft and an annular end fitting disposed coaxially therewith. The shaft and fitting have corresponding ends abutting at a joint. An annular collar surrounds the shaft and fitting over the joint and is bonded thereto for carrying torsional, tensile, and bending loads across the joint. In this way, a composite main shaft may be joined to a monolithic end fitting.

Abstract: A safety system for use with boats to be stored in enclosed buildings to minimize potential problems of fires and explosions. This system has a transmitting unit for attachment to the boat itself which is energized when the electrical distribution system of the boat is energized. This transmnitting unit generates a signal indicating this energized state. A receiving unit associated with the building receives any output signal of the transmitting unit and sounds an alarm when this output signal is detected by the receiving unit. In the preferred form, the transmitting unit and the receiving unit utilize infra-red light as the generated and received signal. Also in the preferred embodiment, the detector unit has a plurality of detector elements arranged along the side and top edges of a doorway leading into the storage facility. As a result of this system it can be assured that no boat with an energized electrical distribution system is stored within the facility.