Melchior FRANZ writes:
>
> Get into an aircraft with autopilot (preferably one with 2D panel, e.g.
> the c182), climb to some safe altitude, then switch the autopilot to
> altitude lock. Now pitch up or down manually and watch the elevator
> trim go to the opposite direction. While it is off, unlock the altitude.
> The elevator trim is left at its last position, which may be quite
> extreme and can make the aircraft somewhat difficult to handle, until
> it is (slowly?) trimmed back to a sane state by the pilot.
Yes this is a *pain*
FWIW - Here is what I have been using
Norman
/**
* Set the autopilot altitude lock (true=on).
*/
void
FGAutopilot::setAPAltitudeLock (bool lock)
{
static double old_trim = 0.0;
if (lock)
{
set_AltitudeMode(DEFAULT_AP_ALTITUDE_LOCK);
old_trim = globals->get_controls()->get_elevator_trim();
}
else
{
globals->get_controls()->set_elevator_trim(old_trim);
}
if (get_AltitudeMode() == DEFAULT_AP_ALTITUDE_LOCK)
set_AltitudeEnabled(lock);
}
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