Copyright © 2015 Grand Rapids Technologies, Inc.
Electronic Flight Instrumentation for Experimental Aircraft Since 1991
GRT is (to our knowledge) the only Experimental EFIS manufacturer to display this widely-
Percent Power and Specific Fuel Consumption (SFC)
A direct indication of engine efficiency, specific fuel consumption (SFC) is a precise way to monitor fuel consumption and engine efficiency. SFC is defined as the number of pounds of fuel consumed for each horsepower generated for 1 hour. The lower the value, the more efficient the engine is operating.
To calculate SFC, the GRT EFIS requires an EIS with a calibrated fuel flow sender, a manifold pressure sensor, and performance values for your specific engine. SFC can be calculated and displayed on any GRT EFIS system.
To program the EFIS with the engine performance data necessary for SFC:
SFC is displayed next to other measures of fuel efficiency, such as MPG, and trip data.
Viewing SFC Calculations on your GRT EFIS
On the HXr (right), SFC, Percent Power, and MPG, shown here highlighted in red, are permanently displayed in the center of the ENG/MAP page between the bar graph banks. They can also be displayed in a configurable data Box or dial for display on the PFD or Map screens.
On Horizon (WS/HS/HX) and Sport models, SFC appears on the Status Box in the center of the Engine screen. It is highlighted in red on the HX screenshot at right. To bring up the Status Box on the ENGINE page, press NEXT until the DATA softkey appears, and highlight STATUS.
Once you learn the SFC numbers for your particular airframe/ engine/ propeller combination, it is simply a matter of observing the SFC to verify proper leaning and efficient operation of your engine.
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