Abstract: A microprocessor receives sensor signals and produces signals proportional to total, longitudinal and lateral air speed. An omnidirectional air speed sensor uses pressure samplers on a rotating arm to produce a sinusoidal pressure differential signal related to air speed. An interrupter disc rotating with the arm periodically exposes an opto-electric sensor to light to produce a pulse phase reference signal. In one embodiment, the pulse signal operates a first ramp generator to produce an arm RPM signal and operates a second ramp generator in conjunction with the sinusoidal signal to produce an azimuth reference signal. The RPM and azimuth signals are fed to a processor to resolve the air speed into longitudinal and lateral components. In the preferred embodiment, the processor receives the pulse signal and produces a pair of out-of-phase square wave signals which control chopper modulators which demodulate the sinusoidal signal to produce signals proportional to lateral and longitudinal speed.

Abstract: A temperature sensor for mounting on a mast of a helicopter has a heat sensor positioned within a central openining in a radially finned heat exchanger. The heat sensor and heat exchanger are spaced rearward from the mast on a tubular sensor support. Long wires helically coiled within the sensor support connect the sensor and terminals on a bracket soldered to the mounting base. The rearward mounting of the heat sensor and the spacing of the heat exchanger and sensor from the mast on the sensor support and the coiling of a long wire within the sensor support between the sensor and terminals on the base and the filling of the sensor support with polyurethane foam resin ensure that the sensor senses air temperature remote from its base and does not sense temperature of the element on which the base is mounted.