Abstract: A lightweight and compact apparatus is provided for altering and controlling the pitch of a plurality of rotating blades during rotation using a mechanical clutch and gear arrangement driven by a rotational speed differential between the blade drive shaft and the blades. A first set of clutches and gears controls the direction of rotational power to the pitch change mechanism and is disengaged from rotation when desired blade pitch is established. A second set of clutches and gears controls the speed of rotational power applied to the pitch change mechanism. This pitch change mechanism includes a failsafe capability against pitch change through disengagement of the directional clutches except when needed, and an inherent rotational lock resulting from the rate change clutches' bias to simultaneous engagement. Variation of that speed of rotational power permits coarse and fine pitch adjustments at variable rates.

Abstract: A system for detecting angular, radial and axial accelerations of rotating machinery parts to facilitate vibrational analysis of the parts. An annular array of micro dots is disposed on the rotating machinery part generally concentric with the axis of rotation of the part. A stationary high resolution photodetector is located for reading the micro dot patterns of movement of the annular array of dots as the array tangentially passes the photodetector. A conditioning circuit is coupled to the detector for conditioning a signal received from the detector.

Abstract: Weight, noise and response difficulties in boilers utilized in torpedoes are eliminated in a construction including a housing having an interior wall, defining a chamber with at least one oxidant inlet. A plurality of working fluid conduits each have an inlet and an outlet exterior of the housing and heat exchange section within the chamber. Each heat exchange section is a plural convolution coil and the individual convolutions of each conduit are interleaved with the individual convolutions of the other conduits. Valves control the flow of working fluid through at least some of the conduits independently of the others.