ImpulseRC Apex

By fjulian79 on Oct 25, 2019

22  2,276  8

I always want to have a copter capable of carrying a GoPro, so here we are. At first I planned to build a ImpulseRC Reverb, but then the Apex has been released before I placed my order and I changed my mind instantly. But I was not that happy with the suggested KISS setup by Mr. Steele. Unfortunately I have not seen other setups then the Kiss based one on the web .. so I think it's a good thing to share my build as my components are more or less the default stuff which is available in all the shops everywhere.

As I have good experiences with the Mamba stack on my Micro Reverb I decided to use here the big one. I have chosen the F405 stack as the price was that good and I don't see a good reason for a F7 stack when using BetaFlight at the moment. I know they are more future proof, but as soon as Beta Flight does not support F4 targets anymore I will by a latest greatest F7 stack at this time and will be served better (hopefully) then with a stack available today. I assume this will take at least one or two years (again, hopefully). The lack of available UARTS is not issue for me as I don't use cam control. Usually I configure my cam's only once when I get them and don't change setting afterwards.Although I am really very very happy with the T-Motor motor's on my Micro Reverb I have decided to go with the Xing 2207 1800kv as I heard only good things about them. So want to give them a try .. beside of that I like the design :-)

All the other components (RX, Cam, VTX, Buzzer) I have taken from my spare part's box as I already had them at home and I have not damaged anyone of them in this summer. So I think I don't need to have them as spare at home.

When taking about the cam .. This is currently a RunCam Swift Mini (Not the second edition or the Jonny FPV edition, the first one). I plan to buy a JonnyFPV edition as I'm interested in the difference, but for now I'm happy with the one I have.

One thing to mention regarding the R-XSR: I'm using FPORT and are happy with it. This interface should be available on every FrSky receiver.

The build was easy and straight forward, the frame kit's quality is awesome as usual for a ImpulseRC kit. It turns out that the hight of the mamba stack is quite high when using all the supplied spacers. So I decided to use round 3mm spacers without a tread. They are 3mm high, 6mm outer diameter and have a 3mm hole. They can be used with screws included in the frame kit. Between the ESC PCB and the FC PCB I used the spacers which came with stack. So I saved some hight and the R-XSR fits well on top of the stack.

I already performed a first test flight with BF 4.1 ... everything shiny so far. I have observed some prop wash at the end of power loops, but all PID's and filters are stock so far, so I'm sure that this can be fixed by disabling the low pass 2 filers. Vibrations are no issue at all, so turning of these filters shall be no issue. the video quality is also quite fine, no noise issues so far. The cam is OK, but the dynamic range is not that good as the one I'm used to at the Micro Reverb where I'm using a RunCam Phoenix.

As soon I'm familiar with the frame and have flown some packs I plan to create a YouTube video with flight footage. Once this is done I will add the link here. I will also post findings and new related to this build here, so stay tuned if you are interested ;-D


Part List


Apex 5" Base Frame Kit (10 builds)

Flight Controller

MAMBA F405 MK2 Betaflight Flight Controller F40 40A 3-6S DSHOT600 FPV Racing Brushless ESC (91 builds)


4 x iFlight XING X2207 1700KV 1800KV 2450KV 2750KV 2-6S Brushless Motor for RC FPV Racing Drone (40 builds)


Gemfan Flash 3052 Tri-Blade 3" Prop 4 Pack - Choose Your Color (65 builds)

FPV Camera

RunCam Swift Mini 2 - JohnnyFPV Edition - 600TVL CCD FPV Camera 2.1mm (12 builds)

FPV Transmitter

TBS UNIFY PRO32 NANO 5G8 (225 builds)


Foxeer 5.8G Lollipop 3 2.5DBi Omni Antenna RHCP (2pcs) (98 builds)


Frsky R-XSR Micro Empfnger 16ch S.BUS / CPPM Telemetrie (863 builds)


6 x Tattu R-Line 6S 22.2V 95C 1300mAh Lipo


FrSky 2.4G 16CH Taranis X9D Plus Transmitter SPECIAL EDITION w/ M9 Gimbals (50 builds)


FatShark Dominator HDO 4:3 OLED Display FPV Video Goggles 960x720 for RC Drone (119 builds)

HD Camera

GoPro Hero5 Session (267 builds)


PolyMax 3.5mm Gold Connectors 10 PAIRS (20PC)

Misc Parts

HellGate FPV Buzzer - HellGate FPV Buzzer (17 builds)

Video Receiver

ImmersionRC RapidFIRE w/ Analog PLUS Goggle FPV Receiver Diversity Module (145 builds)


QuadGuard BP X3 Drohnen Rucksack, schwarz (2 builds)


RF Explorer 6G Combo
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Power_FPV   Feb 09, 2020  

hows video on this build? i have my antenna in pretty much the exact same spot, but i get horrible video coming back towards me and when behind me... i'm hoping its not my vtx becauee i've already replaced it twice

PilgramFPV   Jan 27, 2020  

what is the capacitor for on this build? and how did you know to use it?

oyvind   Dec 03, 2019  

Great build! Loving it! Mind sharing the file to the gopro couch?

fjulian79   Dec 10, 2019 

Hi ..Well the Session couch on the pictures is my own (kind of experimental design) but I'm not using it anymore.
I switched to this one:

Br J.

Junnicutt   Oct 31, 2019  

Why are you using the 3.5mm bullet connectors? Lower weight or smaller size? Or o you just use them with xt60 adapter?

fjulian79   Nov 01, 2019 

Im using them since ages on my planes, have them on all my gear and I have here ton's of them. So some time ago I thought it would be easier to resolder my new batteries then all my other stuff. The XT60 is using the same connectors internally but is more bulky .. so why not using them stand alone?

Jodie Froster   Oct 31, 2019  

It's so clean man.... like.. SOOOOO clean

fjulian79   Oct 31, 2019 

Thx .. That was my intention :-D

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