Birdbrain RC SKEW_T

By BirdbrainRC on Feb 19, 2021

28  553  12

So, the MiniSKEW_L is small and all, but once I realised the JHEMCU FC I used in it had a smaller 16x16 sibling, I had to pick one up to try, and came back to an old failed frame design to put it in.

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I originally designed a tiny toothpick size plus frame way back in mid 2019 when 16x16 FCs and ESCs started becoming more widely available, but the first I got (a Diatone Mamba) turned out to be quite fiddly to solder. After a long struggle to get it together, I finally went to power it up...and it had a dead ESC. I rage quit the project, and it sat on my shelf, gathering dust.

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The frame did get a reworking for the new FC - the pod was redesigned to allow the antenna to be pushed through from the inside (original required it to be pushed from the outside, then the UFL clipped to the VTX, which was a huge pain), and the baseplate was reworked to be asymmetrical rather than having both side arms swept back, which brought the motor wires out at the corners of the ESC rather than needing the wires to be fed over the top of the ESC to reach the far pads.

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To fit the VTX and RX, I opted to make a shelf for them as I have in several other quads. I found the nuts were getting in the way, so decided to just drop the hole diameter so the screws grip the printed part tightly, giving a nice flush surface for the electronics to sit on. The components were reused from the original Mamba based build - a NamelessRC VTX, Foxeer Predator Nano (with connector, soldered would be much better from a squishing everything in point of view), and an XM RX. A 3D printed antenna mount which runs parallel to the capacitor should keep it from getting chopped in the props.

Frame weight: 14g, dry build weight: 54g. Got a couple of different sets of props to try with it, and still waiting on some little LiPos, but hopefully should be a fun little ripper for small spaces!

Photos

Part List

Flight Controller

16x16mm JHEMCU GHF13 AIO F4 OSD Flight Controller Built-in 13A Blheli_S 2-4S 4 In 1 Brushless ESC for RC Drone FPV Racing (7 builds)
Banggood.com
$44.99

Flight Controller

M2 Anti Vibration Silicone Grommets Soft Mount For Flight Controllers x10
Ebay.com
$3.99

Motors

4 x AMAXinno 1103 5000KV 1-3S Brushless Motor 3.7g for RC Drone FPV Racing (3 builds)
Banggood.com
$61.48

Propellers

2Pairs Gemfan Hurricane 2512 Durable 3 Blade 2.5" Propeller for Toothpick FPV Racing RC Drone (6 builds)
Banggood.com
$3.17

Propellers

4 Pairs GEMFAN 65mmS 65mm 2-blade 1mm/1.5mm Hole Propeller for Toothpick RC Drone FPV Racing
Banggood.com
$2.99

Propellers

4 Pairs GEMFAN 65MM 2-blade 1.5mm/1.0mm Shaft Propeller for 0802-1105 Brushless Motor RC Drone FPV Racing
Banggood.com
$2.71

FPV Camera

Foxeer Predator V5 Nano FPV Camera (Black)
Hobbyrc.co.uk
$40.87

FPV Transmitter

NameLessRC Nano400 VTX 5.8G 48CH PIT/25mW/100mW/200mW/400mW Switchable FPV Transmitter VTX for RC Drone (5 builds)
Banggood.com
$16.99

Receiver

FrSky Ultralight XM Mini RC Receiver Up To 16CH for RC Drone FPV Racing (8 builds)
Banggood.com
$20.99

Batteries

Turnigy Nano-Tech 450mAh 3S 45C Lipo Pack w/XT30
Hobbyking.com
$6.69

Radio

Jumper T-Lite 16CH Hall Sensor Gimbals CC2500/JP4IN1 Multi-protocol RF System OpenTX Mode2 Transmitter Support Jumper 915 R900/C (18 builds)
Banggood.com
$69.99

Radio Module

TBS CROSSFIRE NANO TX (9 builds)
Pyrodrone.com
$69.95

Radio Module

Frsky R9M Lite - Radio Transmitter Module (Black) (11 builds)
Getfpv.com
$47.99

Radio Module

FrSky R9M 2019 915MHz RC Transmitter Module w/ Super 8 Antenna (ACCST/ACCESS)Default Title (17 builds)
Racedayquads.com
$45.99
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Discussion

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dwhacks   Apr 15, 2021  

So any updates? Any chance you'd share the STL for the top of the FC mount print, and perhaps the canopy? I've got a couple of these FC's.

Kowalski4711   Mar 12, 2021  

Have a stupid question. Where is the TX1 PAD?

Show 3 more comments
Kowalski4711   Mar 12, 2021 

It's the one top left - where the blue wire from the VTX goes.
there is RX without 1. maybe its a mistake.

Kowalski4711   Mar 12, 2021 

i will try ty.

Kowalski4711   Mar 12, 2021 
1

ok ok. vtx is rx and the pad on the board is tx. easy. :)
that was stupid.

Tsilva11   Mar 11, 2021  

the arm design is well thought out. most plus i have seen using an aio end up with a hole right where you don't want one. nice work

dwhacks   Feb 28, 2021  
1

Ok ok, this caught my eye RIGHT away. I hope you are going to be selling the frame! Put me first in line!

fovea   Feb 19, 2021  
1

awesome!

DannerD3H   Feb 19, 2021  
1

Nailed it!.. Again xD

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