The Heli Monster - Thorax Hex

By Apeian on Mar 21, 2018

13  946  6

Wanted to break up the quad monotony here, so I figured I would build a hexacopter. I wanted to do it on the cheap, and when I saw how inexpensive the Hobby King Thorax frame was game on! ;) My bro gave me an old CC3D EVO (F1) laying around, which fit the ticket, but I will warn you the CC3D setup as a HEX on Betaflight was a firmware nightmare (ex. one esc input would always be dead)...Cleanflight latest rev however worked great! Props go out to Jeff Goss for making me the prototype skin for this build - real craftsman over there - you will not be disappointed! :)
I was able to at least use OneShot 125 on the ESCs, Multishot would not work because the CC3D is to old. It flies absolutely fantastic on the stock pids and fast as @#$%! I added lighting so I can fly it LOS at dusk. Whole deal was under $200... ;)

HD Maiden using the Firefly Q6:


Part List


HobbyKing Thorax Mini FPV Drone Frame Kit

Flight Controller

New Version OpenPilot CC3D EVO Flight Controller STM32 32-bit Flexiport for RC Drone FPV Racing (3 builds)


6 x Favourite Little Bee 20A 2-4S Naked Board ESC (No BEC)


6 x Eachine Falcon 210 210 Pro 250 250 Pro 2204 2300KV CW CCW FPV Racing Brushless Motor


2 x Team RACEKRAFT 5051 5" TRI-BLADE PROP - INSANE SPEED (Green Clear) (123 builds)

FPV Camera

Caddx Turbo S1 1/3 CCD 600TVL IR Blocked FPV Camera Yellow/Green NTSC/PAL DC 5V-40V Wide Voltage (6 builds)

FPV Transmitter

HGLRC GTX226 5.8G 40CH 25mW 200mW 600mW Switchable FPV Transmitter VTX SMA RP-SMA Female (16 builds)


Realacc Pagoda RHCP Right Angle Antenna 6.5cm 65mm 5.8G 5dBi Omni-directional FPV Short Antenna (3 builds)


Redcon 2.4G Satellite Receiver With Code Key For DSM2 DSMX JR Spektrum Transmitter (6 builds)

Power Distribution

Matek Systems PDB-XT60 W/ BEC 5V & 12V 2oz Copper for RC Drone FPV Racing Multi Rotor (139 builds)

Misc Parts

Red or Green LED Lights Headlight For 1/10 4WD Rock Crawler Axial SCX10 RC Car

Misc Parts

1 PCS Waterproof COB Injection LED Module Strip Light Window Store Front Lighting Lamp DC12V

Misc Parts

Flight Controller Protection Cover Plate Damping Plate Controller Board for Martian Series frames for RC Drone (4 builds)

Misc Parts

Suleve™ M3AS8 10Pcs M3x35mm Knurled Standoff Bolt Nut Aluminum Alloy 6061 Multicolours (11 builds)
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Watsamatta   Mar 22, 2018  

Cool build! Any chance you can update this post with some pics of how you wired everything up? I'd be interested to see the innards of this hexacopter!

Apeian   Mar 22, 2018 

Sure - I'll try to get some pics with the top off. Because the CC3D does not have an OSD, I'm using the Caddx Cam OSD. Wired the CAM & VTX to the VCC terminals on the PDB so I can monitor battery voltage while doing FPV. Since I did that, I was not using the +5V output on the VTX, so I wired the headlamps to that. The +5V supply on the PDB is used for powering the CC3D (You use all 3 wires on one of the ESC connectors going to the CC3D to do that). The taillight uses +12V, and that was wired to the +12V output on the PDB. The ESCs power terminals all go to the PDB.

Since there is no place for a buzzer on the CC3D in HEX configuration, I changed the ESC beacon time to 2 minute delay and cranked up the volume in case the HEX goes down I can find it. I also bought a battery voltage detector (plugs into the balance plug on the battery) that will buzz as well if I'm flying LOS so I know when I'm low. This thing DRINKS, so got a 2200ma 80C 4S and a 2700ma 65c 4S. OMG...this thing HAULS ASS bud....must be close to 70-80MPH at least... :p I will get some FPV footage uploaded when the weather gets better here.

Watsamatta   Mar 22, 2018 

Ooh thanks for the info! Cant wait to see the fpv footage! You said it "drinks" lol, so what kind of flight time are you getting out of the 2200/2700 batteries?

I'm currently buried under a foot of snow, so i feel ya man! Spring needs to hurry!

Apeian   Mar 22, 2018 

If I'm not beating on it, I can get like 8-10 min. Haven't tried hammering it on the new batteries, but I literally killed my Venom 1800ma 75C 4S battery because of hammering, and it was like 4-5 min ride without the FPV gear on it yet...LOL

UnderDawg   Mar 22, 2018  

Love it!!! I'm a big hex fan.

Apeian   Mar 22, 2018 

Thx man! I've seen your builds, and a compliment from you means a lot! :)

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