Explorer LR4

By truckz on Jan 25, 2024

6 0 2

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

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.
I wired the GPS signal wires backwards. Oops.
Could only use a very small piece of UMMAGRIP without putting it over 250g.
Had to remove the TPU arm guards to keep the weight in check. Currently 248g AUW.
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. Replaced the sticky pad with Ummagrip Lite.

Photos

Part List

Frame	Explorer LR O3 Frame kit Flywoo.net	$34.99
Flight Controller	Diatone MAMBA F722 Mini MK4 Combo Stack - 40A 20x20 Rotorvillage.ca	$139.99
Motors	4 x iFlight Xing2 1404 3000KV Motor (2 builds) Pyrodrone.com	$63.96
Propellers	Gemfan 4024-2 4" Hurricane Durable T1.5mm Prop - (4CW+4CCW) (6 builds) Rotorvillage.ca	$5.49
FPV Transmitter	DJI O3 Air Unit Rotorvillage.ca	$329.99
Receiver	HappyModel ExpressLRS TCXO EP1 Dual RX Rotorvillage.ca	$34.99
Batteries	【B086】2PCS Explorer 750mAh HV 15.2V 80C 4S1P Lipo Battery Pack - XT30 (2 builds) Flywoo.net	$35.99
Hardware	M2 Metal Hardware Kit - 230pcs Rotorvillage.ca	$17.99
Misc Parts	FLYWOO Finder V1.0 w/ LED BUZZER (6 builds) Flywoo.net	$8.99
Misc Parts	GOKU GM10 Mini V3 GPS (5 builds) Flywoo.net	$8.00
Misc Parts	Ummagawd UMMAGRIP Lite - Super Sticky Battery Pad (5 builds) Rotorvillage.ca	$6.39

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Discussion

Felias - eyefly Feb 06, 2024

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

truckz Feb 06, 2024

thanks! about 8 minutes during testing. I think it will cruise for longer with warmer outside temps.
Edit: got a warmer (+10C) day to fly and went for 8:11 before landing with 3.57v remaining. I'm happy with that.

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