according to https://www.avsim.su/f/dokumentaciya-obshego-znacheniya-16/samolet-uti-mig-15-instrukciya-po-tekhnicheskoy-ekspluatacii-i-obsluzhivaniyu-kniga-2-26680.html
AGI-I and DGMK-3 drift from abrupt maneuvers not yet implemented (but
they are supposed to self-correct over time anyway).
Very large patch by Michael Danilov: thanks!