January 2, 20251 yr How many do you set by default when flying in X-Plane 12 ? And if you can leave an explanation on the thread even better... For instance I use 3 by default, but increase it to 5 or 6 when flying helicopters. Flying gliders since 1980 Flightsimming since 1992 AMD Ryzen 5600x, 32GB RAM, GPU Nvidia RTX 3060 Ti 8 GB, 1 TB and 500 GB nvme2 SSD drives, HP 27" 60Hz LED monitor @ 1920x1080, T16000, Hotas from old X52 Pro, Saitek Combat Rudder Pro (2010 model)
January 2, 20251 yr Commercial Member I have always used 1, and never saw any issues during flight, except when flying ultra fast aircraft (military jets), then I used 2 or 3 and it was ok. So, just to be clear, if you see FPS lower than 20-30, you will certainly need to choose the value of 2-3. For others that can pull off 60+ fps, the value of 1-2 is completely ok for GA/Airliners (can't vouch for more sensitive stuff as ultralights and mil. jets). Regarding helis, I was mostly flying Vskylabs R66 and Dreamfoil S300 with the value at 1, in VR, at 45fps, no issues. Correct me if I was missing something. Edited January 2, 20251 yr by Pe11e Current system: ASUS PRIME Z690-P D4, Intel 12900k, 32GB RAM @ 3600mhz, Zotac RTX 3090 Trinity, M2 SSD, Oculus Quest 2.
January 2, 20251 yr I keep it by default, I think that is 2. But I haven‘t experienced that much with it. I guess higher values also impacts the fps? i9 12900k, RTX 3090, 32GB RAM
January 3, 20251 yr FWIW my default is 6 and is set by LR for my system. All my sliders are max except shadow quality. Running on 8GB GPU NVIDIA RTX2070 Super. Frame rate in sim variable never less than about 30 generally high 40s. No Stuttering or tearing or other constriction anomalies. Guess it is processor dependent. Not yet had a model slow the sim down noticeably or much at all - weather and cloud yes can drop it to 30-36 FPS and that is heavy cloud etc. Edited January 3, 20251 yr by coastaldriver
January 3, 20251 yr For some reason, I run four. Probably because I thought it would make the R22 more manageable. And it just got stuck there. However, I don't really get why the parameter should be relevant in the first place (yes, I read the UI help text). If your aircraft needs a few physics iterations per frame to fly reasonably well, it's either badly set up in PM or the simulator's flight model is just bad. But I never got the impression that X-Plane's Blade Element Theory based model requires value convergence to some degree in order to produce sensible results. Maybe at the n-th decimal of a value or so, but certainly nothing where it's "fly or crash". The only scenario for which I can imagine setting "flight models per frame" to higher values is beneficial is actual aeronautical engineering where you want to make absolutely certain that the flight model is not introducing any rounding errors into the force calculations whatsoever. 7950X3D + 7900 XT + 64 GB + Linux | 4800H + RTX2060 + 32 GB + Linux My add-ons from my FS9/FSX days
January 3, 20251 yr 6 hours ago, Bjoern said: However, I don't really get why the parameter should be relevant in the first place (yes, I read the UI help text). If your aircraft needs a few physics iterations per frame to fly reasonably well, it's either badly set up in PM or the simulator's flight model is just bad. But I never got the impression that X-Plane's Blade Element Theory based model requires value convergence to some degree in order to produce sensible results. It's not necessarily correlated to how the aircraft is set up in PM. For light and/or fast aircraft, if delta-t is too big, the flight model will not be stable or even diverge. That's to be expected in a physics simulation, and is not indicative of the simulator flight model quality. Indeed, X-Plane mostly works fine even with a very low flight model frequency (20 Hz used to be the minimum required to avoid the flight model running slower than real time). For example, JSBSim in Flight Gear defaults at 120 Hz, and it wouldn't probably work correctly at frequencies as low as 20 Hz. "Society has become so fake that the truth actually bothers people".
January 4, 20251 yr On 1/2/2025 at 4:46 AM, jcomm said: How many do you set by default when flying in X-Plane 12 ? And if you can leave an explanation on the thread even better... For instance I use 3 by default, but increase it to 5 or 6 when flying helicopters. Yes - the same, especially for helos or hi po aircraft. Interesting how much of an improvement it makes. IMO worth the increase even if a graphics downgrade is necessary to offset.
January 30, 20251 yr Just made an interesting observation: Spawned the default ALIA-250 on the carrier deck at 2 flight model iterations and observed it gliding on the spot. Set the iterations to 10 and the gliding got much, much worse. Another aircraft (MarcelleO's Buccaneer) even started gliding toward the edge of the deck at an alarming rate at FM = 10 and mmuch, mmuch slower at FM = 2. So I guess more does not automatically mean better. Edited January 30, 20251 yr by Bjoern 7950X3D + 7900 XT + 64 GB + Linux | 4800H + RTX2060 + 32 GB + Linux My add-ons from my FS9/FSX days
January 30, 20251 yr Author 1 hour ago, Bjoern said: Just made an interesting observation: Spawned the default ALIA-250 on the carrier deck at 2 flight model iterations and observed it gliding on the spot. Set the iterations to 10 and the gliding got much, much worse. Another aircraft (MarcelleO's Buccaneer) even started gliding toward the edge of the deck at an alarming rate at FM = 10 and mmuch, mmuch slower at FM = 2. So I guess more does not automatically mean better. If driven by GIGO, more multiplies the "G" effects 😁(G from GIGO, not the Gravity...🤪) Edited January 30, 20251 yr by jcomm Flying gliders since 1980 Flightsimming since 1992 AMD Ryzen 5600x, 32GB RAM, GPU Nvidia RTX 3060 Ti 8 GB, 1 TB and 500 GB nvme2 SSD drives, HP 27" 60Hz LED monitor @ 1920x1080, T16000, Hotas from old X52 Pro, Saitek Combat Rudder Pro (2010 model)
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