Differences

This shows you the differences between two versions of the page.

--- aircraft:tmd:turbo_engines [2021/02/12 13:05] – [Step 6 - Engine control (FADEC)] jh
+++ aircraft:tmd:turbo_engines [2021/02/12 13:51] – [Step 6 - Engine control (FADEC)] jh
@@ Line 457: / Line 457: @@
 Enrichment = Engine1Station3.OutputTotalPressure / ( PitotTube.StaticPressure * DesignCompressionRatio ).
-FuelFlowRaw = C_FF * ( Governor + Enrichment )
+Gain = PitotTube.StaticPressure / 101325.0
+FuelFlowRaw = Gain * C_FF * ( Governor + Enrichment )
 FuelFlow = clamp( FuelFlowRaw, MinFuelFlow, MaxFuelFlow )</code>
-where C_Gov is your governor gain (about 0.2 is ok), and C_FF is your fuel flow constant, use your maximum takeoff fuel flow at the beginning. MinFuelFlow is your idle fuel flow at high altitude (high enough to prevent flame out) and MaxFuelFlow is your takeoff fuel flow plus a small amount.
+where C_Gov is your governor gain (about 0.2 is ok), and C_FF is your fuel flow constant, use your maximum takeoff fuel flow at the beginning. MinFuelFlow is your idle fuel flow at high altitude (high enough to prevent flame out) and MaxFuelFlow is your takeoff fuel flow plus a small amount. DesignCompressionRatio is the compression ratio that you see at takeoff power (depending on the engine data, ranges between like 11 to 42).