By q-ratz on Dec 09, 2018

10  568  14

In this incarnation of the Rotorx Switchback i managed to cram all the components in there without using longer screws than the default 25mm ones. This is quite challanging in a 3 board stack. I initially had the HGLRC Zeus, which burnt after a few flights. Then i had the Hobbywing Nano Stack which resulted in a burnt motor. I could not figure out what the issue was, because the Hobbywing stack hab no blackbox capabilities. Therefore i swithced to the HGLRC F420 stack, which has flash memory for blackbox-logging. My motors would still run very hot on the RX344TXNG props even after detuning a loooot. Now with the HQ 3x3x3 i get a flyable long range capable quad at exactly 250gr. However, since i detuned a lot to cope with motor temperatures i need to fly around certain propwashy situation to get good video results. Initially i had frozen video proplems with the Runcam Split mini, but those were gone after swithcing to a quicker SD Card and powering the Split from 5V BEC.
I guess i can say this thing is still in progress. It flies ok for now, but not the way i think it could. The next steps are already planned:
1) Switch motors to the new Emax 1306B 4000kv
2) Use the new Talon F7 FC
3) Change to either Spedix IS25 or Aikon AK32Pin 25A if it ever gets released

The flight times as of now are well beyond 7 minutes on 850mah. The furthes distance i got without failsafing has been 1.4km, with a roundtrip voyage of about 4km.

UPDATE 1: Switched motors to the new Emax 1306B 4000kv, which are just amazing!
UPDATE 2: Switched HGLRC-Stack in favor of Talon F7 and the new version Spedix IS25 with integrated current meter.

And finally a quick note to HGLRC on their GPS module: Why the hell doesn't that thing come with silicone wires?!?!

A Long range video


Part List


RotorX Switchback 3 Inch Frame Kit (11 builds)

Flight Controller

Talon F7 BB 20X20 Flight Controller (13 builds)


Spedix 25A 4in1 ESC 20x20 M3 (8 builds)


4 x EMAX RS1306B 4000Kv Micro Motor (10 builds)


HQ T3x3x3PC

FPV Camera

RunCam Split Mini FPV Camera / HD 1080P 60 FPS Recorder (57 builds)

FPV Transmitter

SpeedyBee TX500 5.8G 48CH 25/200 / 500mW Schaltbarer Video Sender Eingebauter MIC für FPV RC Flugzeug (2 builds)
See Site


TrueRC AXII MMCX FPV Antenna 5.8ghz - RHCP and LHCP (7 builds)


Team BlackSheep TBS Crossfire Nano Receiver (SE) (412 builds)


FlexRC FPV Racing Drones | FPV Multicopter Store | Quadcopter Parts (101 builds)


Akku 4S1P 850mAh 70C 14,8V LiPo AMAXinno
See Site


FrSky Taranis X9D Plus 2.4GHz ACCST Radio & X8R Combo w/ case (Mode 2) (52 builds)


Fat Shark Dominator HD2 Terminator Edition FPV Goggles (4 builds)

HD Camera

GoPro HERO5 Session (303 builds)

HD Camera

Foxeer 4K Box Action Camera SuperVision (10 builds)

Misc Parts

HGLRC Tiny GPS and GLONASS Receiver Module For iNAV (4 builds)
See Site

Video Receiver

ImmersionRC rapidFIRE w/ Analog PLUS Goggle Receiver Module (178 builds)

Radio Module

TBS Crossfire Micro TX V2 (154 builds)

Battery Charger

iSDT SC-620 500W 20A MINI Smart LCD Battery Balance Charger (3 builds)

Soldering Iron

TS100 Ltkolben KIT + TS-I inkl. XT60 Kabel (265 builds)
See Site
Show stores (13)


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Rice_Bowl   Dec 23, 2018  

hows the motors dude? i was supposed to buy those emax 1306 version 2 but i already had 2 dys 1404 4300kvs so i just bought 2 more. Any problem so far with those emax motors?

Show 5 more comments
Rice_Bowl   Dec 25, 2018 

im still waiting for a 550...if you want ill tell you what 1404 is like with a smaller bat:-)

Rice_Bowl   Dec 27, 2018 

hey can i ask a favor. How long of a flight time do you get from those 1306 motors from something like a 550mah 4s (youre average freestyle ripping session). Im planning on changing to those motors but most of my batteries are 550mah. rn my 1404 motors get me around 5 mins, but i only really need 3 mins each. If you have any info about your flight time please do tell me :-)

q-ratz   Dec 27, 2018 

I will try. My smallest 4S lipo has 850mah. I will ask my the guys from my local group whether someone has a 550mah.

sergetania   Dec 09, 2018  

1.4 km is quite impressive!
They say that the RX3044 prop was designed specifically for 1404 motors. I absolutely hated them on a couple of my 1404 builds. You have a rather heavy quad with that big battery. Try Emax Avan 3x2.4x3 props. They should work well. Edit: sorry, the Avans may not fit on the 1404 ver 2 because of the square top of the motor bell.

Show 1 more comment
sergetania   Dec 10, 2018 

I think it will fly much better with 1306s. 1404 are fine long-range but I think they are boring. I have just built a 3" massive droner with Emax 1306 motors and I love them.

q-ratz   Dec 10, 2018 

Well, my hope is that the 1306 will not draw that much more current when going long range, but still have the power when needed.

q-ratz   Dec 10, 2018 

And if they do draw to much current, the emaxes will go on my acrobrat and the 1404 will stay on my rxsb. The purpose of the switchback is to fly where i can't use any other quad.

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