Very informative. Thanks.And you actually did that ?
Once the AC battery hits CRITICAL ... you CANNOT over-ride the auto-land feature ...
The only action you can do is slow the descent and / or deflect the AC from its dead vertical location ...
Page 13 of manual makes this clear ....
The matter of auto-land is based on (again as per Page 13) where only enough battery remains to allow descent from the present location.
Remember that any action you then impose will INCREASE power drain and can cause power failure BEFORE landing out ...
OK - the myth of ATTI vs GPS mode and speed .... yes you can fly faster with ATTI ....BUT that means you are drawing more power from the battery to fly faster ...
Power drain is not a linear matter as throttle increased. Why ?
a) As you fly faster - drag increases and resistance to movement - increases power required.
b) Motors have efficiency curves and most efficient power point is never at 100% ... it is much lower in the usually 70 - 80% region.
c) Power draw ratio to output increases exponentially as you increase demand. Based on increased heat production in motor, in the battery itself, friction and drag in the motors.
d) As speed increases propellers enter into high speed areas especially at tips and their efficiency and conversion of power to speed reduces. As in b) Propellers have their prime efficiency point.
ATTI mode also means you are flying totally manually and not in a nice straight line ... I've been flying models for over 50yrs and I cannot fly as straight as P-GPS mode on RTH .... therefore any tiny saving you have in mA from P-GPS will be outweighed by your not so straight path home.
In P-GPS as well as ATTI mode - you can affect flight path ... and best is to leave P-GPS so you have straight line flight ... but add a slow descent so you are losing height in a gradient to your Home Point ... this avoids the large vertical element over Home Point, saving power.
I know there are some who will argue about the above ... fair enough ... each entitled to own PoV.
Nigel