HX115 LR HDZero 3S 18650 3500mah / 1106 4200KV / 3 inch / 250g 27 minutes

By Mio on Jun 13, 2022

12 740 8

After trying iNav 5.0 and Optical Flow several days, I meet several problems.

Motor current is too high, and the MAX Current shows 26A(it may be incorrect).
Optical flow can not work with GPS on PosHold and AltHold mode.
Default PID and RPM filter is not good as Betaflight.

Therefore, I decide to remove optical flow and use betaflight 4.3.
Because of raining days, I test hover flight indoor and get around 11A max current and average 9A(including 1A 25mW HDZERO and 0.5A GPS and ELRS EP1). (It should fly around 20-30 mins for 2S 3500mah)
The throttle is around 56-70%(8.2V-6V)(8.5A-10A) and bad, so cannot do freestyle action.
I will try to change props to decrease a little throttle.

2022 6.16 Update:
The 3500 mah 18650 can work 4.2V to 2.5V.
But when battery approch 6V(single 3V), throttle increases above 70% and flight attitude is not stable.
I think it should be F7 Fc only support 2S-6S. May try 1S-3S FC or change to 3S 18650.
2022 6.16 Update:
12V booster is broken after connecting 3S battery, so remove it.
Change to use 3S 18650: Total weight around 250g / throttle 41% (12V / AVG 7.5A-8A)
I'm satisfied with this settings.

2022 6.17 Update:
Hover Test

2022 6.29 Update:
Move 1 battery tray to bottom and add GPS

Photos

Part List

Frame	HX115 LR Frame Kit (4 builds) Betafpv.com	$12.99
Flight Controller	HAKRC F722 2-6S AIO Whoop/Toothpick Flight Controller w/ 8Bit 40A ESC & External USB Board (10 builds) Racedayquads.com	$86.99
Motors	4 x EMAX 1103 1105 1106 1104 4300KV moteur sans balais 2 4S 2 3 pouces FPV course Drone RC quadrirotor BabyHawk KINGKONG 2345 AVAN 2 (3 builds) Fr.aliexpress.com	$7.36
FPV Camera	HDZero Nano HD Camera By Runcam (5 builds) Pyrodrone.com	$36.90
FPV Transmitter	HDZero Whoop HD Video Transmitter By Divimath (25 builds) Pyrodrone.com	$49.99
Receiver	HappyModel 2.4GHz EP1 RX ELRS Receiver (107 builds) Racedayquads.com	$13.49

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Discussion

Viktoschi Jul 24, 2022

hi
which target did you use for inav?

garacool Jun 21, 2022

Interesting experiments
look overweight. I use 18350 2s for emax tinyhawk.

Mio Jun 23, 2022

Throttle is only 41% for 3S, so I feel it's light.

Felias - eyefly Jun 14, 2022

Nice build! What flighttimes are you getting?

Show 1 more comment

Felias - eyefly Jun 15, 2022

wow, thats a lot. But have you calibrated the current meter yet? At how much throttle (%) does it hover?

Mio Jun 15, 2022

iNav is hard to tune filter and PID, so finally I back to use betaflight.
Hover flight: 8.2V Avg 8.5A 56% throttle

Mio Jun 16, 2022

Change to 3S 18650
Hover flight: 12V Avg 8A 41% throttle

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