Hi. Configuration: KSP(32-bit running at win10 64) + FAR 0.15.5.1 + B9 Aerospace PP 040. New sandbox game, SPH. Plane: MK1 Cockpit + 2.5m to Mk2 Adapter + pair of default B9-PW procedural wing, attached to adapter symmetrically. Hit "calculate stability derivatives"-> [LOG 14:13:28.602] Cl needed: 0.219553213250486, AoA: [U][B]8.93616890452798[/B][/U], Cl: 0.219555753150062, Cd: 0.0585985597428482 Save plane, load plane, immediately calculate derivatives multiple times: [LOG 14:13:36.807] Cl needed: 0.219553213250486, AoA: [U][B]8.32275683624796[/B][/U], Cl: 0.219553847216515, Cd: 0.0554604062202605 [LOG 14:13:36.851] [U][B]Voxelization Time[/B][/U] (ms): 133 [LOG 14:13:37.574] Cl needed: 0.219553213250486, AoA: [U][B]8.93616904241133[/B][/U], Cl: 0.219555753364412, Cd: 0.0585985622304511 Apparently voxelization is done in async way and FAR UI allows user to do calculations even if voxel data is not yet ready?! Anyways, "Alt-F4", restart KSP, load game, SPH. Load saved plane, immediately calculate derivatives multiple times: [LOG 14:34:33.574] Cl needed: 0.250963117554013, AoA: [U][B]5.19214418803282[/B][/U], Cl: 0.250968271573626, Cd: 0.0336926737031383 [LOG 14:34:33.721] Cl needed: 0.219553213250486, AoA: [U][B]5.19817097502654[/B][/U], Cl: 0.21955771119412, Cd: 0.0307685545714892 [LOG 14:34:34.748] Updating 1 [LOG 14:34:34.798] Voxelization Time (ms): 49 [LOG 14:34:35.055] Cl needed: 0.219553213250486, AoA: [U][B]5.51811751012141[/B][/U], Cl: 0.2195573244047, Cd: 0.0285063247681396 Welp! Loading plane 2-nd time seems to bring back 8.3-8.9 AoA values: [LOG 14:34:45.979] Cl needed: 0.219553213250486, AoA: [U][B]8.32275683624796[/B][/U], Cl: 0.219553847216515, Cd: 0.0554604062202605 [LOG 14:34:46.008] Updating 1 [LOG 14:34:46.058] Voxelization Time (ms): 50 [LOG 14:34:46.163] Cl needed: 0.219553213250486, AoA: [U][B]8.93616904251385[/B][/U], Cl: 0.219555753359357, Cd: 0.0585985621999771 logs + craft file: https://drive.google.com/open?id=0B9jPuSLpZVo8dmU3ZnVEVEVPZzA