Arx-R v2 hybrid ultralight

By BloodyLordV on Aug 13, 2019

13  291  7

So, after a shitload of work with burning flight controllers it is here - Quadstardrones Arx 5r v2 hybrid. First of all - I higly don't recomend Iflight succex mini stack for this built - I've burnt 4 FCs in the row becouse vtx antenna was pushing down the flight controller sitting only on rubber standoffs -kakute f7 mini, having the built in vibroinsulators can be securly mounted on the nylon standoffs guaranting a non problematic usage.

AUW 399g

So, after a short while of testing I can say a few words.
Firstly - vertical arms help with control. I guess it is thanks to the rectification of the air vortex created by the prop. Thanks to this the vector of thrust has less work to do as smaller changes in RPM create more of the vertical force. Once again - it is only my guess.

Unforunatelly, although the controll is much better than in my legit 4h lite the 4 inch had noticably better top speed and acceleration, althought the 5 incher seems to have at least comparable bottom of thrust.

All in all - I am quite happy with this one and can't wait to showing you what this setup can do!

Thanks to my sponsor - Adam Demon Tusk DemonRC


Part List


Oops! That page can’t be found.

Flight Controller

Kakute F7 Mini 20x20 Flight Controller (9 builds)


SucceX Mini 35A V3.0 2-6S 4-in-1 ESC Dshot1200 (M3) (3 builds)


4 x DRC WILDFIRE MOTOR (2205, 1777kv )


Gemfan 51466x3 Hurricane Durable (4pcs) MCK (38 builds)

FPV Camera

RunCam Micro Sparrow 2 (60 builds)

FPV Transmitter

TBS Unify Pro Nano 5G8 (93 builds)




FrSky XM+ SBUS Mini Receiver (1408 builds)


TATTU R-Line 1050mAh 6s 95C Lipo Battery (42 builds)
Show stores (6)


Sign in to comment

ThumbzFPV   Aug 16, 2019  

Welcome to the club! We are few. And we are proud. Also, if you clean that build up you'll get ALOT more speed out of it. I've got a 6" that does 130mph on 4S 2450kv. The speed can be had, just takes a little work.

BloodyLordV   Aug 19, 2019 

Hello! It so nice to see such a warm welcome. I have to change the ESC and one motor so cleaning up electrical instalation will be done. I'll update the photos.

As for the speed - it is reather caused by the size of and weight of motors in the 5 inch class. To achive higher top speed I would need to use higher motors and those are heavy and in consequence reduce the nimbleness of my quad. Thats why I achived it in a 4 inch quad, where I could use high 1408 motors while keeping low weight (also those motors were a trash as they were ripping the windings during small crashes).

As for the Arx - it is very, very good.

ThumbzFPV   Aug 19, 2019 

Trust me, if you put 2207 mid-kv motors on there and streamline the motor spars you'll get alot more speed out of it. You'll add ~40g to your AUW in motors, but if you remove the motor wire braiding and LEDs you'll make up some of that weight. That's what I'd do if you're unhappy with the motors. 2206 motors do actually make alot of sense on these though! I got a racing buddy I know (way faster than I am) to start using them and it's amazing seeing him switch frames and improve just because of that.

fovea   Aug 14, 2019  

nice a new nice build from you, thanks for share! sadly your issue with the fcs. hope for a dvr.

BloodyLordV   Aug 15, 2019 

Unforunatelly you'll have to wait for about 2 weeks for the DVR. I also have a short break becouse I'vs smoked an ESC and a motor. Thankfully in 2 days I'll have the new ones (New ESC will be ori32)

HK-AERIAL VTOL   Aug 13, 2019  

(John McClaine's Voice) Welcome to the party, pal!

BloodyLordV   Aug 13, 2019 

After 2 forced months - you have no idea how nice it is to hear. The manevroubility of this quad freakin rocks!

Guides & Reviews

39 3,947  46
May 05, 2020

This guide will walk you through the process of building your first FPV quad. The goal with this design was to build a low-cost, lightweight quad, yet powerful enough to safely carry a GoPro in close proximity areas. I chose these parts to minimize the amount of soldering at no cost to the quality. A typical build requires around 30 solders while this only needs 25. It's not a huge difference, but..

Read more
28 7,761  38
Nov 30, 2019

In late 2019 DJI made inroads into the FPV scene with their remarkable low-latency digital system. It gave us a 720p video feed with latency on-par with the status quo, analog video. Traditionally we've used analog video systems for low-latency video, but the video quality is far from ideal. It's a trade-off we've been willing to accept for the control. Now we've got the best of both worlds and what..

Read more