RotorX Atom 4" - BFF3

By betodiaz91 on Jan 22, 2018

4  348  6

This build was an upgrade from my first ever build.
Iterations go: --> --> This build

I decided to upgrade from the v1 frame, to the v3 4" frame.

This build is using a BetaflightF3 board paired with Spedix20a Lite. The motors are BH1407's 4100kv (previously used with 3").

I started out trying some rx3044t's on 4s, and really liked the stability. Initially I didn't want to try 4" props on 4s so only used them on 3s. I thought the esc's wouldn't be able to handle it. But on a 'fuck it' impulse, I decided to try them on 4s and it was absolutely nuts. The esc’s have been holding up great.


  • AUW (850 4s) - 296g
  • AUW w/o HDcam (850 4s) - 270g
  • AUW w/o HDcam (700 4s graphene) - 252g
  • AUW w/o HDcam (850 3s) - 250g

Definitely more fun without the HDcam and on 4s, but still flies great with everything on.


Part List


RotorX Atomic Fox 5" Quad/Quadcopter Freestyle Titanium Center Plate Carbon Fiber Frame (6 builds)

Flight Controller

BetaflightF3 Flight Controller (134 builds)


4 x Spedix ES20 Lite 2-4S 20A ESC (40 builds)


4 x BrotherHobby Tornado T1 1407 4100Kv Micro Motor (14 builds)


HQProp 4x4.3x3 V1S Propellers (9 builds)

FPV Camera

RunCam Micro Swift (192 builds)

FPV Transmitter

Eachine ATX 03 Video Transmitter - 25/50/200mw (VTX03 with Audio) (21 builds)


Spektrum RC DSMX Quad Racing Serial Receiver w/Telemetry (5 builds)


Tattu 850mAh 14.8V 75C 4S1P Lipo Battery Pack (XT30) (35 builds)

HD Camera

GoPro HERO5 Session (300 builds)

HD Camera


Misc Parts

RotorX Atom V2 LED Bar (3 builds)
Show stores (8)


Sign in to comment

The Quadfather   Jan 26, 2018  

the hd camera, it seems really really cool, but is there a more noticeable jello or the like because of a higher refresh rate? Im curious before I decide to try it (oh, and nice footage. Is that DVR?)

betodiaz91   Jan 26, 2018 

I’m not sure if the jello is due to the higher refresh rate of the cam. I think the vibrations in my videos are cause of the tune. I also have slight delaminations in the frame causing the arms to wiggle a bit. The videos linked were taken with the RXHDcam

The Quadfather   Jan 27, 2018 

awesome, im interested to try out the hd cameras

betodiaz91   Jan 27, 2018 

It's really good and it only weighs about 30g

acromode   Jan 23, 2018  

4" props with a 4s lipo on those motors is going to SUUUCCK amps - way more than 20a

betodiaz91   Jan 23, 2018 

I’ve been flying this setuo for months. Surprisingly they don’t pull as many amps as you’d think. The ESC’s can take it and the motors come down just slightly warm. Without the weight of the HDcam, I’ve been able to fly for over 7mins cruising around.

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