For what it’s worth, there are similar reports of the Hobbs meter (and some other state saving items) not working correctly in Black Square’s planes on SU4 Beta.
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I find the Hobbs works like it should in SU3. I have 129.3 hours flying time but only 104.2 hours on the Hobbs. As the Hobbs is tied to RPMs when taxiing after landing or drifting along with the throttles closed, the Hobbs runs slower.
All the way back to FS2020 it has always run a bit slow. I just did an 8 hr 29 min flight and the Hobbs only moved around 7 hrs. Since that seems to be something no one complains about in a long time, I’ve not pushed for it, but it is always slow.
This new problem with it not saving the time seems to be an SU 4 thing. It was saving fine on SU3, and I’m pretty sure on earlier SU4 builds.
Okay, I really blew this one!! The Hobbs should run on power-up or, at the very least, when oil pressure is detected. In any case the hours on the Hobbs should reflect actual hours from startup to shutdown with an hour on the Hobbs equalling an hour of actual time.
It looks as though what we have here is more like a tach counter even though the instrument is labelled “Hobbs.” Here’s why I think this:
My total flying hours in this Albatross are 132.55 while the “Hobbs” shows 106.9. I just did some math and the “Hobbs” is showing only 80.6% of the actual inflight hours which is, according to what I’ve read, about par for the course for a tach counter.
What I’ve got in my log is far more accurate than what the simulator time is because there are more than a few flights that don’t show on the in-sim “logbook.” The hours in the sim’s logbook only show 59:42:30 (or 59.71 hours) for the Albatross. That’s a lot of flights missing. I know that, for a while, it seemed the sim wouldn’t acknowledge a flight that began and/or ended at a custom departure/destination on water. More importantly though, the Hobbs registered hours even if flights didn’t register at all.
The custom departure/destination on water issue seems to be fixed since SU3.
Until SU4, the Hobbs generally recorded all flights even if the logbook forgot them. But it’s not accurate. Your 80% is roughly what I’ve seen all the way back to 2022 when I got MSFS 2020. It’s an in game bug I think.