By LowkeyCamo on Jan 02, 2019

6  555  6

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This is my first long range build. This build has been nearly 5 months in the making. My goal with this build is to have a quad that can fly at least a mile away using the R9 system by Frsky. Also, I wanted to use parts I already have experience with to make this build as straight forward and reliable as possible.

Hardware Notes:
I used the same frame, except with 6 inch arms, (the same one that survived the fire, hence the name) and camera from my Hooter Butter build.

From my LowkeyStyle build I used the same FC, 4in1 ESC, 30x30 version of the VTX and 1900kv version of the motors.

For the long range system I decided to use the R9M module and the R9 Slim+ because it seemed easy to set up with the Q X7 and the price was right. I experimented with a couple antenna mounting solutions for the RX antennas and finally made a custom mount out of an old gopro mount. It was a stuggle to get the R9 system dialed in until they released a new firmware version. With this antenna orientation and firmware I've had solid RF performance. So far the furthest I'v flown is just over a mile with no issues.

The ESC, FC and VTX stack fits nicely in this build with 25mm standoffs. This makes mounting everything clean and easy. I have a 1000uF 35v capacitor on the battery lead.

As part of trouble shooting failsafes I added a capacitor to the RX. With the new fireware im not sure if it's necessary, but its pretty easy to add a cap to the slim+. I just used connector 2 and removed all the wires except the + and - wires and soldered them to a 470uF 25v capacitor.

And of course what would a long range build be without GPS? Having GPS has been awesome. I love being able to see my speed, having a home arrow in my OSD and having return to home failsafe.

Even though I have a bottom mounted battery I added foam landing pads to the ends of the arms to keep the props from striking the ground on landings and takeoffs.

For a gopro mount I couldn't find a 3d printed one for this frame I liked so Im just using a piece of yoga foam I cut into a 30 degree wedge.

I've tried two different 6 inch props so far. The EMAX Avan long range bi blade prop and the HQ V1S tri blade props. With an 1800mah battery I can fly for about 5 min and cover about 4 miles with the EMAX props and I can fly for about 4 min and cover about 3 miles using the HQ props. I think ill probably switch back and forth between props depending on where I'm flying and how far I'm trying to fly.

Software Notes:
FC: Betaflight 3.5.2

ESC: Blheli_32 running DShot 1200, motor timing is set to AUTO and frequency is set to 48 Hz.

TX/RX: F.Port 181228

If you have any question about my build please feel free to comment with a question.


Part List


STRIX Screech Freestyle Frame Kit - Black TPU - RMRC (10 builds)

Flight Controller

BrainFPV RADIX 30x30 Flight Controller (Custom Graphical OSD, Baro, Stackable, Betaflight) (43 builds)


DALRC Engine 32Bit 40A 3-5S 30x30 4in1 ESC w/ BEC (43 builds)


4 x EMAX Lite Spec LS2207 1900Kv Racing / Freestyle / Long-Range MotorDefault Title (42 builds)


EMAX Avan 6x3.8x2 Long Range Bi-Blade 6" Prop 4 Pack - Choose Your Color (6 builds)

FPV Camera

Caddx Turbo SDR2 1200TVL FPV Camera

FPV Transmitter

AKK FX2 25-800mW VTX w/ Smart Audio - MMCX (17 builds)


Lumenier AXII Long Range 5.8GHz Antenna - RHCP or LHCP (4 builds)


FrSky R9 Slim+ 915MHz Long Range Receiver (9 builds)


RDQ Series 1800mah 4S 100C FPV Lipo Battery


FrSky Taranis QX7 2.4GHz RC Transmitter - White or Black (94 builds)


8 x M3 Knurled Standoff - CHOOSE YOUR COLOR AND SIZE - 5, 10, 15, 20, 25, 30, 35mm - (1 PC)Light Blue / 25mm (9 builds)

Misc Parts

2 x STRIX Screech-R and Freestyle XL Arm

Misc Parts

Race Wire - PCB Motor Wires (Full Size & Mini) (7 builds)

Misc Parts

UMMAGRIP – Universal Super Sticky Battery Pad by Rotor Riot (63 builds)

Misc Parts

2 x FrSky 900MHz Ipex1 Dipole T Antenna for R9 Slim / R9 Slim+ Receiver

Misc Parts

TrueRC True-Mox 915 Antenna (2 builds)

Misc Parts


Misc Parts

Battery Protector/Bumper (3 builds)

Misc Parts

2 x Lipo Battery Strap - 250mm - V3 Upgraded Metal Buckle - $0.99

Misc Parts

GPS Mount on Lipo Battery Strap (BN-180) by pathfinderzero
See Site

Radio Module

FrSky R9M Transmitter Module (17 builds)


FRSKY M7 Gimbal - Hall Sensor Gimbal
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nelsam95   Jan 15, 2019  

How did you connect the radix to the dalrc 4in1? I just bought both components and am unsure about connecting the two. Does the dalrc esc have a ribbon cable that will connect them? Or do I need to make one? Thanks.

LowkeyCamo   Jan 15, 2019 

You kinda have to make your own using the connector from the Dalrc engine and from the Radix. I took all the wires out of the connector for the Dalrc engine and inserted the wires from the connector for the Radix. You can see how I have it set up in one of the side pictures and also in my LowkeyStyle build I did the same thing. You just have to look at the documentation and make sure you match the wires up right.

LowkeyCamo   Jan 15, 2019 

Also, depending on how you have your ESC oriented it might be easier to direct solder the wires from the dalrc engine connector to the Radix FC. I changed the orientation of the ESC on my builds because it matches the the side the connectors from the FC to the ESC and I like having my power lead comming from the side. If you are going to do that you have to use resource mapping in Betaflight to reasign motor locations on the ESC.

nelsam95   Jan 15, 2019 

Thanks for the quick reply. I'll have to take a look when it all gets here. I'll probably reach out again if I have some questions, thanks.

Jodie Froster   Jan 05, 2019  

Is your OSD in metric or murican'?

LowkeyCamo   Jan 05, 2019 

'Murican, cause thats what they taught me in school.

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