Explorer LR4

By truckz on Jan 25, 2024

4  0  2

My custom build of the popular micro long range design.
Some issues I encountered:

  1. on this FC, UART 1 is shared with the DJI O3 and interfered with my RX. I moved the RX to UART 5 instead of pulling pins from the O3.
  2. I wired the GPS signal wires backwards. Oops.
  3. Could only use a very small piece of UMMAGRIP without putting it over 250g.
  4. Had to remove the TPU arm guards to keep the weight in check. Currently 248g AUW.
  5. The only place I could fit the RX is sandwiched behind the O3 camera. I cannot adjust the camera angle now.

Update 1: de-casing the O3 camera and removing the TPU arm guards removes 4g. The camera has room to be adjusted again.


Part List


Explorer LR O3 Frame kit

Flight Controller

Diatone MAMBA F722 Mini MK4 Combo Stack - 40A 20x20


4 x iFlight Xing2 1404 3000KV Motor (2 builds)


Gemfan 4024-2 4" Hurricane Durable T1.5mm Prop - (4CW+4CCW) (6 builds)

FPV Transmitter

DJI O3 Air Unit


HappyModel ExpressLRS TCXO EP1 Dual RX


【B086】2PCS Explorer 750mAh HV 15.2V 80C 4S1P Lipo Battery Pack - XT30 (2 builds)


M2 Metal Hardware Kit - 230pcs

Misc Parts

Ummagawd UMMAGRIP Lite - Super Sticky Battery Pad

Misc Parts

GOKU GM10 Mini V3 GPS (2 builds)

Misc Parts

FLYWOO Finder V1.0 w/ LED BUZZER (6 builds)
Show stores (3)


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Felias - eyefly   22 days ago  

very nice and clean build! What flight-times are you getting with that battery?

truckz   22 days ago 

thanks! about 8 minutes during testing. I think it will cruise for longer with warmer outside temps.

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