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Point of no return

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You can easily help yourself with radio telemetry. What I do.
Knowing that the battery can easily hold 25 minutes of flight (I did once 32 minutes with a return to 15%), I do not hold now on a battery time of 20 minutes which is less tiring battery. I prefer to use two batteries and keep them longer.
Telemetry gives everything on the screen. The flight time since the beginning, the distance traveled and the most important the distance between the ST16s and the H520.
Now if we fly for 15 minutes and the distance displayed is 4000 meters, we know that for the remaining 5 minutes, we can still do between 1300 and 1400 meters.
A glance at the radio, distance between radio and h520, if the measurement given is less than this remaining distance, we can return serenely and we know that we have a battery reserve of 5 minutes still behind.
I'm working like this and since 2015, I have never lost a device, or have had a RTH or have it engaged.
There is no scientific measure that will give you the moment of the NRP.
The only help is telemetry on condition of not losing it.
After, there is the habit, the feeling and the conditions of flight.
 
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@claudius62 Are you saying H520 can fly about 5.5 km with one battery ? ( not distance from RC) but follow a flight 5.5 km long.
 
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Yes easy, calculated from the flight log 3970 m / 12 minutes x 20 minutes = 6600 meters, it's even better. This at 20km / h on average.
But the secret is a cool speed, no sudden acceleration, to plan to start against the wind and finish in the direction of the wind.
Adopt steady drive, cool flight, and time gain.
Do not use sudden acceleration that exhausts the batteries.
What is not possible in flight Survey but in flight video landscape.
 
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Hello maybe a tricky question,

is there a calculation of "point of no return" on the H520 ?
or a formula, chart, or any other way to know if the drone can make it back home ?
Personally I finish up what I'm focused on at 15 volts and started routing for home, unless I have good data on the pack that says I can got a bit lower, but the second I see 14.8 even briefly, I check altitude and and hit RTH. If it's a new pack, I hover it for the first flight and watch the pack's performance and then fly accordingly until I have a clue as to how it behaves.
 

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