Solid State Instrument System for Digital Counting and Continuously Indicating Count Results.
DEPARTMENT OF THE NAVY WASHINGTON D C
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The patent describes a digital solid state engine RPM sensing and indicating system for multi-engine aircraft, the RPM indications made simultaneously in the form of side-by-side bar graphs and side-by-side numeric displays for each engine showing RPM as a percentage of rated RPM, the displays being formed by light-emitting diodes and the system arranged such that the bar graphs indicate changes at each 5 percent of noted RPM below 70 percent and at 1 percent above 70 percent. Special current limiting and cooling features are provided to handle the current requirements of the diodes and power supply.
- Flight Control and Instrumentation