Rodeo Posted March 22, 2022 Report Share Posted March 22, 2022 (edited) Using version 1.4r1, macOS Catalina, X-Plane 11.55 I have code to print the HLIS dataref's contents after touchdown when passing 25 knots GS and decelerating: if (onground_any > 0) { if (25.0f > (XPLMGetDataf(flightmodel_groundspeed) * 3.6f / 1.852f)) { if (delta_acc) // XPLMFindDataRef("CL650/HLIS/delta_acc") { log("[info]: landing (detected): CL60 HLIS acc %.3f\n", XPLMGetDataf(delta_acc)); } } } Resulting in: [info]: landing (detected): CL60 HLIS acc 6.104 Compared to (HLIS button pressed for two seconds later on, i.e. soon after engine shutdown, checked on the display and crosschecked with the CSV log): HLIS % grep DeltaG HLIS-1.csv DeltaG,0.622 HLIS % The difference (6.x vs. 0.6x) seems significant. Questions: am I printing the wrong dataref? is it not a float (seems unlikely)? do I have to process delta_acc get to DeltaG somewhow? do I really have to print the dataref even later than I do now? is there a different issue I'm not aware of? Regards, Tim HLIS-1.csv.zip HLIS.nvram.zip Edited March 22, 2022 by Rodeo 1 Quote Link to comment Share on other sites More sharing options...
Pils Posted March 22, 2022 Report Share Posted March 22, 2022 (edited) Here is what Toto said: The datarefs are named: ``CL650/HLIS/delta_acc`` - the recorded peak delta-acceleration in m/s/s ``CL650/HLIS/norm_acc_log[0..120]`` - a running log of the normal acceleration (in m/s/s) received by the HLIS from the IRSes. Entry [0] is the latest data and progressing backwards in time at 40 samples per second. This gets continuously overwritten in flight and stops being updated 3 seconds after landing (at which point the HLIS computes the peak delta-G value). Edited March 22, 2022 by Pils 1 Quote Link to comment Share on other sites More sharing options...
Rodeo Posted March 22, 2022 Author Report Share Posted March 22, 2022 Right, so I need to compute the peak delta-G somehow myself then, correct? Regards, Tim Quote Link to comment Share on other sites More sharing options...
Pils Posted March 22, 2022 Report Share Posted March 22, 2022 (edited) 10 minutes ago, Rodeo said: Right, so I need to compute the peak delta-G somehow myself then, correct? Regards, Tim Yes. “Somehow” is a simple division. ¯\_(ツ)_/¯ Edited March 22, 2022 by Pils Quote Link to comment Share on other sites More sharing options...
Rodeo Posted March 22, 2022 Author Report Share Posted March 22, 2022 Good point. It's past my bedtime though, AP ON BRAIN OFF 2 Quote Link to comment Share on other sites More sharing options...
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