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Wonky LNAV with the Wilco/FeelThere 737?

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Fat chance I'm going to get support for an aircraft that's turning 18 soon, but here goes...

Just on a whim of nostalgia, plus general frustration of modern sims, I re-installed FSX, as well as the Wilco 737PIC. For some reason, on my first test flight, it kept "dodging" waypoints, it would turn sharp left/right right before hitting the waypoint, and then at some point it would correct itself and turn back, creating these annoying unrealistic bumps in the flight path. I'm not sure if fiddling with my flight plan while programming the FCU caused it to bug out, if I'm missing something, if an update broke it recently, or it's just known to do this?. Otherwise, it still works very well in 2025, albeit surpassed visually by other aircraft.

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That's with simulation rate at 1x? The only Wilco product I had issues with was the Airbus (all of them), but only if I went overboard with simrates (8 or 16x in FS9).

Best regards,
Luis Hernández 20px-Flag_of_Colombia.svg.png20px-Flag_of_Argentina.svg.png

Main rig: self built, AMD Ryzen 7 5700X3D (with SMT off and CO -50 mV), 2x16 GB DDR4-3200 RAM, Nvidia RTX 5060Ti 16GB, 256 GB M.2 SSD (OS+apps) + 2x1 TB SATA III SSD (sims) + 1 TB 7200 rpm HDD (storage), ID-Cooling SE-224-XTS air cooler, Viewsonic VX2458-MHD 1920x1080@120-144 Hz (G-sync compatible), Windows 11. Running P3D v5.4 (with v4.5 scenery objects as an additional library, just in case), FSX-SE, MSFS2020, MSFS2024 and even FS9! Lossless Scaling for all my sims. What a godsend...

Mobile rig: ASUS Zenbook UM425QA (AMD Ryzen 7 5800H APU @3.2 GHz and boost disabled, 1 TB M.2 SSD, 16 GB RAM, Windows 11 Pro). Running FS9 there .

VKB Gladiator NXT Premium Left + GNX THQ as primary controllers. Xbox Series X|S wireless controller as standby/mobile.

  • Author
23 hours ago, Luis Hernandez said:

That's with simulation rate at 1x? The only Wilco product I had issues with was the Airbus (all of them), but only if I went overboard with simrates (8 or 16x in FS9).

Yep, I did it on a relatively short flight so no simulation rate required, with hand-programming in the route. I haven't done a second try yet, but while programming the route, I had some issues regarding programming the approach and such, so I'm curious if that might have messed it up.

  • Author

After trying the flight again (this time properly programming the route in the FMC), and I had the same issue, but this time on the departure side of things. The aircraft rolls left/right, and then starts rolling back the other way to get back on the LNAV path, making an ugly bump in the flight path. My best guess is that the aircraft bugs out (maybe on an Alt-Tab?) to follow heading mode, and if the heading bug isn't aligned with the flight path, it starts turning off-path. I did find one other post on here from 2012 with a very similar issue, but no solution. I'll do more tests and reading to see if I can figure out why this is happening, or if someone else has already solved this issue.

Hi, having had various issues with Wilco aircraft in FS2004, I have been reluctant to buy anything from them for FSX. However, if you want a 737 that offers a lot more than the Wilco 737PIC in FSX with superb systems and FMC replication, I can highly recommend the iFly 737. I know this doesn't answer the question you asked but, having been using FSX since soon after it was first released and bought and flown many addon airliners, the iFly 737 essentially has become my go-to jetliner which I keep reverting to simply for its reliability, lack of frustrating 'quirks' and smooth performance in FSX.

Bill

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