After suggesting it to someone else, I've just reinstalled the ATR 42-500 by Claus Vendelboe Holmberg (well, the refinement he did of Francisco Sánchez-Castañer's work, atr425dk.zip in the "other site"). I'm liking a lot the final product, however I've seen some unstability in the pitch axis (always wanting to nose down). I checked the aircraft.cfg file and saw these lines (I'm showing only the relevant ones):
[WEIGHT_AND_BALANCE]reference_datum_position=000, 0, 6.800empty_weight_CG_position=000, 0.000, -8.000station_load.0=0.000000,0.000000,0.000000,0.000000empty_weight=32832.000[fuel]LeftMain=0.000, -14.500, -5.000, 758.000, 0.000RightMain=0.000, 14.500, -5.000, 758.000, 0.000[airplane_geometry]wing_root_chord=8.830
That's right, only one empty payload station, centered at the CG. The aircraft and its fuel tanks are also centered (in the fwd-aft axis) at CoG. The CG should be then at 25% MAC, right? Wrong: FS' payload & fuel editor shows a CG of -18% MAC (yes, negative, CoG in front of the wings), which explains the pitch-down tendency. I edited the Weight & Balance section so that there could be a distribution of the payload (i.e. not everything centered at CG). These are the lines I changed:
[WEIGHT_AND_BALANCE]reference_datum_position=000, 0, 6.800empty_weight_CG_position=000, 0.000, -8.000station_load.0=340.000000,26.000000,0.000000,0.000000station_load.1=4560.000000,-10.000000,0.000000,0.000000station_load.2=3420.000000,5.000000,0.000000,0.000000station_load.3=1400.000000,20.000000,0.000000,0.000000empty_weight=24802.000
I added 3 payload stations: one for flight crew, one for the forward and aft cabin each, and another one for the cargo. Doing my own math, the CG should be at 23% MAC. However, the CG seems unaffected by these changes, CG is still at -18%. How could I fix this balance problem?Best regards from Colombia,Luis Miguel
My rig: Toshiba Portégé R835-P81 laptop (Intel i5 2435M @ 2.4GHz, 6 GB DDR3 RAM, Intel HD3000 (yes, not good), 640 GB HDD, 256 GB SSD, Windows 10 Professional)
Saitek X-52 / Xbox 360 wired / eDimensional G-Pad Pro wired controllers.