QAV CodeRed 3"

By hubris on May 29, 2018

3 9 2

My goal here was to build a 3" for proximity flying that is robust and agile on 3s and 4s.

My starting point was CodeRed's "Full Build" video on YouTube, but I wasn't happy with the way the motor wires were routed (around the edges of the ESC) because they did not permit the red side walls to lay flat, so instead I routed the motor wires over the top of the ESC between it and the FC. I also rotated the FC as compared to the build video to provide access to the USB port.

The camera is powered from the 5V output of the TBS Unify, and the TBS Unify and FC are both powered by VBat. The R-XSR is powered by 5V from the FC. SmartAudio is hooked up to UART3 on the FC.

190g dry.

Photos

Part List

Frame	QAV-CODERED Mini FPV Quadcopter 3" (6 builds) Getfpv.com	$30.58
Flight Controller	Lumenier MICRO LUX V2 - F4 Flight Controller + OSD (20 builds) Getfpv.com	$26.99
ESCs	Lumenier Mini BLHeli_S 25A 4-in-1 OPTO ESC DSHOT (4 builds) Getfpv.com	$44.99
Motors	4 x Lumenier RX1407 3800Kv Motor (3 builds) Getfpv.com	$79.96
Propellers	Lumenier 3x4x3 V2- Propeller (Set of 4 - Transparent Black) (15 builds) Getfpv.com	$2.24
FPV Camera	RunCam Eagle 2 FPV Camera - 4:3 (16 builds) Getfpv.com	$44.99
FPV Transmitter	TBS Unify Pro HV 5G8 - Race (SMA) (555 builds) Getfpv.com	$29.99
Antenna	TBS Triumph 5.8GHz FPV Antenna LHCP Stubby RP-SMA (Set of 2) (3 builds) Getfpv.com	$39.99
Receiver	FrSky R-XSR 2.4GHz 16CH ACCESS/ACCST Micro Receiver w/ S-Bus & CPPM (937 builds) Getfpv.com	See Site
Misc Parts	QAV-CODERED TPU Camera Mount (3 builds) Getfpv.com	$9.99
Misc Parts	Quad Antenna Flex Mount (2 builds) Getfpv.com	$7.99

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Discussion

cmt7896 Apr 07, 2019

a friend of mine gave me this frame to start out with, is there a auto one stack that u could recommend???

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cmt7896 Apr 14, 2019

thank you hubris!!!

cmt7896 Apr 14, 2019

what do u think about 1107 motors with 7500kv as a substitute motor size???

hubris Apr 14, 2019

I would not use those motors for a 3”

nickbusscher Aug 28, 2018

Nice build man! Did you have any issues with hot motors with the RX1407? I run them on a 3" ducted frame and they run hot no matter what PIDs/Filtering I use it seems.

hubris Aug 28, 2018

I run the same motors on a ducted frame as well. They a little warmer than I'd like on the ducted frame, but no issues on this build (using 3S). But then, that ducted frame flies terribly anyway. Was great for learning, but that's about it.