2.5" BR25 / Runcam Split Mini / 1106 / R-XSR

By fiveomustang on Jul 06, 2018

4  361  9

Based on https://rotorbuilds.com/build/11447 , I wanted to do a 2.5" prop build after completing my first 5". Everything went together well and it flies great on Betaflight 3.4! The RunCam Split Mini records way better video than I expected. Running all stock PIDs in Betaflight. I get about 4 minute flight times out of the 500mah batteries charged to normal voltages.

Here is the maiden flight video!

There is a pic of it next to my Martian II 5" for size comparison.

Update, upgraded to Betaflight 3.4 release version and added a spare gps for the heck of it. Return to home works great on the 2.5", ha ha!


Part List


BR25 2 and half inch frame kit (2 builds)

Flight Controller

HGLRC F4 Zeus F4 Flight Controller Integrated with OSD BEC PDB AIO 15A BLheli_S 4 In 1 ESC for RC Racing Drone (15 builds)


4 x EMAX RS1106 6000KV MOTOR (1 PCS) - Heli-Nation


4 Pairs Gemfan Flash 2540 2.5x4 2.5 Inch 3-Blade Propeller with 1.5mm Mounting Hole (171 builds)

FPV Camera

RunCam Split Mini FPV Camera / HD 1080P 60 FPS Recorder

FPV Transmitter

Eachine VTX03 Super Mini 5.8G 72CH 0/25mW/50mw/200mW Switchable FPV Transmitter (417 builds)


Realacc UXII Stubby RHCP U.FL/IPEX IPX 5.8GHz 1.6dBi Mini FPV Antenna For TX RX Fatshark Goggles R (28 builds)


FrSky R-XSR Ultra SBUS/CPPM D16 16CH Mini Redundancy Receiver 1.5g for RC Multirotor FPV Racing Drone (936 builds)


6 x Turnigy Bolt 500mAh 3S 11.4V 65~130C High Voltage Lipoly Pack (LiHV) (5 builds)


FrSky X-Lite 2.4GHz RC Transmitter w/ 18650 Battery Caps - Black or Red (65 builds)


FrSky Taranis Q X7 2.4GHz 16CH Transmitter (White) (263 builds)


Fat Shark Dominator HDO FPV Goggles (137 builds)

HD Camera

GoPro HERO8 Black - Waterproof Action Camera with Touch Screen 4K Ultra HD Video 12MP Photos 1080p Live Streaming Stabilization (18 builds)

Misc Parts

5Pcs Realacc 58mm Battery Tie Down Strap for RC Micro FPV Racing Quadcopter Multirotor (6 builds)

Video Receiver

ImmersionRC rapidFIRE w/ Analog PLUS Goggle Receiver Module (179 builds)

Radio Module

TBS Crossfire TX LITE (6 builds)

Radio Module

TBS Crossfire Micro TX V2 (43 builds)
See Site

Soldering Iron

Aoyue 469 Variable Power 60 Watt Soldering Station with Removable Tip Design- ESD Safe (10 builds)


Lowepro LP36899PWW Slingshot Edge 250 AW - A Secure, Slim, Smart and Protective Sling for a Compact DSLR or DJI Mavic Pro/Mavic
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Ifly@sgfpv   Dec 09, 2022  

do u think this motor can handle 4s?

imreallythatguy   Jul 11, 2018  

2 quick questions. First is your video recorded with the Runcam or did you ziptie a gopro on or something? 2nd what is the pink and green box you have ziptied on in your very first photo? The one that looks like it has a button on top...

fiveomustang   Jul 11, 2018 

Video is from the RunCam, and the box on top is a UBLOX micro GPS module. This quad can return to home on failsafe instead of just drop (new feature in Betaflight 3.4).

ghostface   Jul 10, 2018  

Cool build! I am just about done with my rebuild using the new sides :D Only thing I did differently is using a tx20 as vtx which meant it was an ultra tight build height wise.

Out of curiosity, can you share your pids/config for bf 3.4 please since we are running practically identical builds :)

fiveomustang   Jul 10, 2018 

I'm no expert tuner so I'm using the stock 3.4 PIDs still but here are the values. Let me know if I missed anything.

ghostface   Jul 11, 2018 

Thank's a bunch - looking pretty smooth for stock tune :D

ghostface   Jul 10, 2018  

btw. you got the bumpers on upside down - if you put them on the other way they will act as soft mounts :)

fiveomustang   Jul 10, 2018 

lol! Thanks for the tip! That makes sense

ghostface   Jul 11, 2018 

Your welcome! Just watch out for the c-clip and that it doesn't bind with the edges of the hole when the motor turns.

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