Birdbrain RC Chisel 6

By BirdbrainRC on Jun 22, 2020

18  362  4

Done so many super tight race quad builds lately, then the nightmarish Silence project, so I figured I'd take it easy and rebuild one of my old freestyle quads - and of course decided to design a new frame for it, which then escalated into something daft, naturally.

Frame design started sensible, for at least 10 minutes of the CAD process, and then I decided to keep the stack height to 10mm, because of course I did.

Aside from that added challenge, I did make things a bit more sensible than the old Kittilyt design - instead of the deadcat layout I went for a wide X, meaning I can run 6" props without worrying about batteries meeting props, and sized the top plate to fit a 2200mAh pack. Given the very low stack height, I added holes for a second board in the back, whether that be a 30.5x 30.5, 20x20 m2, or 20x20 m3. Since I've been using more micro cameras than anything, I designed the camera cage to fit those, with reinforcement taking the cage up to 5mm of carbon each side at the front, enough to deal with most frontal impacts. I had issues on my old builds where the rx T antenna would slide up and down the arm, so designed tabs into the arm that the cable ties slip between, preventing movement.

As per usual for me, everything is a little overkill, making it a fairly weighty frame at 156g, but for a freestyle quad I can accept a little extra weight if it means it won't break in a massive crash.

Onto the build, and it was a bit of a squeeze! The Matek F405 CTR was fouling on the centre press nuts, so I needed to flip it over to give me room, which in turn meant I cut the wires to length in situ, then soldered it all out of the quad unlike my usual approach of cutting and soldering with the ESCs and FC already in place.

There did turn out to just be enough room for the battery straps over the FC and the VTX in the tail, fortunately - the FC is even still soft mounted! 3D printed mounts for my pair of GoPros complete the quad, and now it's ready to go introduce it to some concrete at a local bando!


Part List

Flight Controller

Matek F405-CTR 30x30 Flight Controller (34 builds)


4 x Spedix GS35A Blheli_32 35A ESC (2-6S) (3 builds)
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4 x 2307 Motor
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DAL T6040C Cyclone Tri-Blade (5 builds)

FPV Camera

RunCam Robin 700TVL 1.8/2.1mm FOV 160/145 Degree 4:3 NTSC & PAL Switchable CMOS FPV Camera (11 builds)

FPV Transmitter

TheFPV Chaos Mini VTX 600mW 20x20 (MMCX and UFL, Smart Audio) - Unmanned Tech UK FPV Shop (4 builds)
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Foxeer 5.8G Lollipop 3 2.5DBi Omni Antenna RHCP (2pcs) (129 builds)


FrSky R9 Mini 900MHz Long Range Receiver (57 builds)


Jumper T-Lite 16CH Hall Sensor Gimbals CC2500/JP4IN1 Multi-protocol RF System OpenTX Mode2 Transmitter Support Jumper 915 R900/C (23 builds)


FrSky Taranis Q X7S Radio w/ Upgraded M7 Hall Sensor Gimbals (Carbon Fiber) (25 builds)


FrSky TARANIS X-Lite (Black) (65 builds)
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ORQA FPV.One OLED FPV Goggles (12 builds)


FatShark Dominator HD 2 Hydro-Dipped Urban Cam Grey and White FPV Goggle
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HD Camera

Hawkeye Firefly 6S 4K WiFi Sport HD DV Camera - $75.31 |

HD Camera

HawKeye Firefly Q6 4K 120 Degree Angle Action Camera - $59.14 | (2 builds)

HD Camera

GoPro HERO6 Black - Waterproof Digital Action Camera for Travel with Touch Screen 4K HD Video 12MP Photos (5 builds)
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HD Camera

GoPro HERO5 Session (303 builds)

HD Camera

RunCam 5 Orange 12MP 4:3 145°FOV 56g Ultra-light 4K HD FPV Camera for RC Drone (21 builds)

HD Camera

GoPro Protective Lens (GoPro Official Accessory)
See Site

Video Receiver

Furious True-D V3.5 Diversity Receiver System Firmware 3.8A (FatShark Attitude Version)SKU: FPV-RX-TRUD3.8A (27 builds)

Video Receiver

ImmersionRC RapidFIRE w/ Analog PLUS Goggle FPV Receiver Diversity Module (179 builds)

Radio Module


Radio Module

Frsky R9M Lite - Radio Transmitter Module (Black) (11 builds)

Radio Module

FrSky R9M 2019 900MHz RC Transmitter Module w/ Super 8 Antenna (ACCST/ACCESS)Default Title (17 builds)


MultiStar Premium Multirotor Travel Backpack




TrueRC True-MOX 868MHz Antenna
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daich   Jun 30, 2020  

oooh, love 10mm height builds! very nice. I recently one as well. They are such a project but I think they look great and are pretty tough too!

kwadkenstine   Jun 23, 2020  

I would like to purchase this frame , will a vista fit

BirdbrainRC   Jun 23, 2020 

I have no idea, it was a reaaaaaaaaaaal pain to build though - I love it, but am working out a couple of changes to make it less of a nightmare to fit everything in there!

kwadkenstine   Jun 23, 2020 

Hi , Please keep me informed, I think you have a real winner with this

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