Steve Davies Posted March 15, 2019 Share Posted March 15, 2019 (edited) It appears that there's a sweet spot in the throttle travel between MIL and afterburner where FFH increases dramatically, but the nozzles remain closed the AB does not light off. You can therefore remain in MIL, but be consuming fuel as though you were in MIN AB. Not sure whether this is a bug, or whether it's a very clever simulation of fuel flow increasing prior to AB light-off. In any case, given that I glance at FFH to indicate whether the AB has lit, I noticed it and thought I would raise it here. Edited April 1, 2019 by IronMike Steve Davies https://www.10percenttrue.com Link to comment Share on other sites More sharing options...
Eldur Posted March 15, 2019 Share Posted March 15, 2019 Did you notice the FF increase on the gauge or just by monitoring the totalizer? The FF gauges shouldn't show AB FF, so they shouldn't jumpt up at all. Link to comment Share on other sites More sharing options...
Steve Davies Posted March 15, 2019 Author Share Posted March 15, 2019 Did you notice the FF increase on the gauge or just by monitoring the totalizer? The FF gauges shouldn't show AB FF, so they shouldn't jumpt up at all. On the gauges, Eldur. Steve Davies https://www.10percenttrue.com Link to comment Share on other sites More sharing options...
Zergburger Posted March 15, 2019 Share Posted March 15, 2019 its called mil power. if you are at 99% or 100% with low TIT and low FF, you are in nominal power. Link to comment Share on other sites More sharing options...
Steve Davies Posted March 15, 2019 Author Share Posted March 15, 2019 its called mil power. if you are at 99% or 100% with low TIT and low FF, you are in nominal power. As I said, it exists *between* MIL and MIN AB. I advance throttles and read 100% RPM on the tapes. I see c.840 TIT and c.950 PPH but burner is not engaged. Now I advance the throttles all the way - nozzles open, burner lights off, PPH and TIT remain the same. Steve Davies https://www.10percenttrue.com Link to comment Share on other sites More sharing options...
Zergburger Posted March 15, 2019 Share Posted March 15, 2019 yes, what you think is mil power is nominal power, you are advancing to mil Mig19, f5, and other jets exhibit the same behavior. Link to comment Share on other sites More sharing options...
BlackLion213 Posted March 15, 2019 Share Posted March 15, 2019 Well it’s important to note that the fuel flow gauge does not show afterburner related fuel flow, only core engine fuel flow. So it isn’t an indication of when the burners have lit. Also, fuel flow is not exactly coupled to RPMs, so you may be seeing the AFTC metering fuel based on throttle position, but not leading to a meaningful change in engine RPM. -Nick Link to comment Share on other sites More sharing options...
Zergburger Posted March 15, 2019 Share Posted March 15, 2019 you will see the nozzles move from just above 0 setting to 0 when you go from nominal to mil. thats how you can tell Link to comment Share on other sites More sharing options...
Steve Davies Posted March 15, 2019 Author Share Posted March 15, 2019 you will see the nozzles move from just above 0 setting to 0 when you go from nominal to mil. thats how you can tell Thanks. I'll take a look at this now. Steve Davies https://www.10percenttrue.com Link to comment Share on other sites More sharing options...
Steve Davies Posted March 15, 2019 Author Share Posted March 15, 2019 Well it’s important to note that the fuel flow gauge does not show afterburner related fuel flow, only core engine fuel flow. So it isn’t an indication of when the burners have lit. Also, fuel flow is not exactly coupled to RPMs, so you may be seeing the AFTC metering fuel based on throttle position, but not leading to a meaningful change in engine RPM. -Nick :thumbup: Steve Davies https://www.10percenttrue.com Link to comment Share on other sites More sharing options...
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