912is Fuel Consumption
Greetings everyone,
I was hoping to pick the brain of those of you that take interest in my topic and take the time to resond. I thank all of you that give this the time of day.
The company I work for uses the engine listed in the subject line on a UAS, during our first 200 hours of flight we had consistent burn rates of about 2.6 gallons per hour on 91 octane. When we switched to 100LL we saw a sgnificant jump in consumption, 3.7 gph. This has significantly reduced our time to stay on station. When we switched back to 91 octane we have yet to see a decent drop in our fuel consumption, we now average 3.5gph.
My questions are the following:
How does the EMU recognize the fuel type? I know the engine takes note from key input variables: throttle valve position, engine speed signal, intake air temperature, ambient pressure, manifold pressure and exhaust temperature and ultimately, the required fuel quantity or injection period is determined on the basis of the calculated air density in the airbox. But I guess I am curious about the characteristics between the two fuels and how the engine performs comparatively.
What are the expected CHT ranges for 100LL and 91octane? We see a split of about 200*F between the two fuel types. I recognize that there is a higher BTU output from gasoline than 100LL, but would this have such an impact on consumption?
Has the community of 912is users seen a difference in fuel consumption when switching fuel types?
How can I recognize when the engine is operating in ECO mode? and If there are no immediate visual indicators via the gauges, how do I see when it kicks in using the logs and the analyzer tool?
Thanks for the help,
DG
