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Gross CG error from PMDG loader causes bobbing

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Gents; I just spent a frustrating couple of hours trying to resolve why my PMDG 737-700 bobs up and down like Rocky in a prize fight. I fired up AFSD, and it told me my CG was something like -43% MAC. Huh? YGTBSM! Sure enough, the PMDG loader put the entire payload at 0,0,0, which in most sims is OK, but in the PMDG 737 that point is at the reference datum, which PMDG have located some 52 ft forward of the standard MSFS 1/4 chord reference point. In other words, the PMDG loader is piling the entire payload weight right at the tip of the nose. Not good. If you edit your station_load.0 so that the first coordinate (second numeric parameter) is the same as the CG (i.e. -48.170) the CG will return to a value within limits, and the bobbing ceases. So, assuming a notional payload of 27704 lbs, instead of: station_load.0 = 27704.0, 0.000, 0.000, 0.000 Use this: station_load.0 = 27704.0, -48.170, 0.000, 0.000RegardsBob ScottATP IMEL Gulfstream II-III-IV-V L-300Washington, D.C.P.S. The PMDG FS2004 loader does it correctly...appears it's just the FS2002 loader that's doing this.

Bob Scott | President and CEO, AVSIM Inc
ATP Gulfstream II-III-IV-V

Sys1 (MSFS20+24/XPlane12+11): AMD 9800X3D, water 2x240mm, MSI MPG X670E Carbon, 64GB GSkill 6000/30, nVidia RTX4090FE
Alienware AW3821DW 38" 21:9 GSync, 2x4TB Crucial T705 PCIe5 + 2x2TB Samsung 990 SSD, EVGA 1000P2 PSU, 12.9" iPad Pro
Thrustmaster TCA Boeing Yoke, TCA Airbus Sidestick, Twin TCA Airbus Throttle quads, PFC Cirrus Pedals, Coolermaster HAF932 case

Sys2 (P3Dv5/v4): i9-13900KS, water 2x360mm, ASUS Z790 Hero, 32GB GSkill 7800MHz CAS36, ASUS RTX4090
Samsung 55" JS8500 4K TV@60Hz,
3x 2TB WD SN850X 1x 4TB Crucial P3 M.2 NVME SSD, EVGA 1600T2 PSU
Fiber link to Yamaha RX-V467 Home Theater Receiver, Polk/Klipsch 6" bookshelf speakers, Polk 12" subwoofer, 12.9" iPad Pro
PFC yoke/throttle quad/pedals with custom Hall sensor retrofit, Thermaltake View 71 case, Stream Deck XL button box

Sys3 (DCS/P3Dv4/ATS/ETS): AMD 7800X3D, MSI MPG X870E Carbon, Noctua NH-D15S, 64GB GSkill 6000/30, EVGA RTX3090
Alienware AW3420DW 34" 21:9 GSync, Corsair HX1000i PSU, 4TB Crucial T705 PCIe5 + 2TB Samsung 970Evo Plus,
TM TCA Officer Pack
, Saitek combat pedals, TM Warthog, TM RS300 FF wheel/pedals, Coolermaster HAF XB case

Wow! I hope this gets fixed.

  • 1 month later...
  • Commercial Member

Bob-as the author of the Load Manager, I am really surprized that this is the behaviour you're noticing - in fact, the Load Manager never actually changes the three coordinates - it only changes the load itself. Is there a possibility that the parameters are not read in correctly in your case? I'd like you to send me your aircraft.cfg (specify which aircraft variation it's for), so I can test it here as well...Cheers,

Lefteris Kalamaras - Founder

www.flightsimlabs.com

 

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