Was away for the weekend, and plenty to reply.. so here goes:
Previously was on .500 firmware, and did use manual landing & RTH to get more flying with 13 ~ 15min of flying. And all high attitude flying, I started my descent when the
battery was in 30%, and managed to land the spark with 2min to spare. It only the last flight with 600 firmware that when the attitude was just less than 100m, i was unable to cancel the RTH function. Luckily the drone was able to land without hitting the tress around.
The reason why I use RTH is bcoz it is the fastest descent speed at 10kmph. Sport mode only at 8kmph and Normal mode at 5kmph. So i reckon using the RTH to descent faster so I have a bit
battery life to fine-tune the landing if necessary. And previous flights with 500 firmware was able to cancel RTH and did manual landing.
I will do somemore test to see if it is one time fluke, or change to 600 firmware code that unallow cancel RTH during critical
battery level. Otherwise must find a good open space in case of forced landing in future.... good luck to those Spark force-land into water bcoz the firmware too stubborn to listen to your command...
"IT guy here, did you try turning it off and in again?"
Well I havent got the time to try again, so will wait for dry weather & big wide open field to do testing again... Maybe they did change something in 600 firmware, so I need to double confirm.
"It all has to do with the battery remaining.... if its below certain % it will override the RTH as the batteries are in danger of cutting of or damaging the lipo.
From what i read you can only pause the RTH if your battery has around 15 20% battery left in it"
That's weird... for once I did purposely delay the landing when the
battery meter show 0% left (at less than 1.6m high and on grassy area), and never once go into failsafe RTH. With 500 firmware.
I've include the airdatas for your reference.
Last flight that cannot cancel RTH with 600 firmware
Airdata UAV - Flight Data Analysis for Drones
similar flight situation with 500 firmware
Airdata UAV - Flight Data Analysis for Drones