on li-ion battery
Power is always variable depending on throttle out pwm
When full throttel . The current value between 30 A and 37 A and this is on TAKEOFF
When Cruise current value to be between 13 A and 20 A PWM about 1600
plane not copter.
Li-po is 25.2 V , 17000 A
I am confuse Li-ion give me long time but with no accurate measurement
If the LiPo is getting hot it must be only a 10C rated, and how did you come by the current measurements?
Have you verified the battery monitors current measurements with a meter?
What have you set the ESC voltage cutoff value to?
In setting up our competition drone we aimed at 1hr flying time with 15Ah of LiPo on board.
9.5kg takeoff and we only got 30min, changed the prop and we got 65min.
Takeoff current was 57Amps but cruise was only 12Amps.
It sounds like you need to do a lot more measuring and tuning.
Flight trimming the plane would also yield benefits, and drag reduction.
Inherent in LiIon batteries is the voltage drop.
Draw a lot of amps and it really sags, which is why they are not that successful in multi rotors.
Using your figures, to cruise for an hour you are going to need between 15Ah and 22Ah battery.
If you are needing 20A to cruise a 4.7kg plane then you some serious inefficiencies you need to address.
We can cruise a 9.5kg plane on 12A to 15A at around 45kph.
This was an off-the-shelf ARF model.
You will need to look into the programming instructions for your ESC to see where the cutoff is set by default.
If running LiIon I would disable it altogether.