Brawler 3"

By evilC on Apr 08, 2020

7  163  2

My self-build take on the BetaFPV TwigXL
Uses my Brawler canopy and my R-XSR mount
All antennas securely fastened to frame or canopy - worst that can happen is the antenna snaps, but the UFL connectors will not get ripped off the boards
Rx antennas mounted inside antenna tubes secured in place with retainers glued to end of tube - if tube snaps, simply slot in another
Canopy is 4mm thick but largely hollow with infill - rigid enough to prevent jello, but airbag-like in properties (Will deform on impact)
Sensi frame normally has 9mm motor mounts, I drilled it out to fit the 12mm mount motors

All connections to FC etc use self-crimped Molex PicoBlade connectors for quick swap-out of parts

Photos

Part List

Frame

Sensi 3 Frame
Dronejunkie.co.uk
See Site

Flight Controller

Toothpick F4 2-4S AIO Brushless Flight Controller 12A(BLHeli_S) (10 builds)
Betafpv.com
$44.99

Motors

4 x 1404 3800KV Brushless Motors (10 builds)
Betafpv.com
$27.96

Propellers

Gemfan 3016 3-Blade Propellers (1.5mm Shaft)
Betafpv.com
$2.50

FPV Camera

RunCam Nano 3 (NTSC only) (6 builds)
Shop.runcam.com
$19.99

FPV Transmitter

TBS Unify Pro32 Nano 5G8 V1.1 (39 builds)
Team-blacksheep.com
$29.95

Antenna

Lumenier Micro AXII UFL 5.8GHz Antenna (LHCP / RHCP)
Unmannedtechshop.co.uk
See Site

Receiver

R-XSR - FrSky - Lets you set the limits (5 builds)
Frsky-rc.com
See Site

Batteries

TATTU 450mAh 14.8V 75C 4S1P LiPo Battery Pack
Unmannedtechshop.co.uk
See Site

3D Printed

Brawler Canopy by evilC_UK
Thingiverse.com
See Site

3D Printed

Frsky R-XSR mount by evilC_UK
Thingiverse.com
See Site

3D Printed

Runcam Nano 3 adapter by evilC_UK
Thingiverse.com
See Site

3D Printed

9×5.5mm buzzer holder by evilC_UK
Thingiverse.com
See Site

3D Printed

Sensi frame 12mm motor drill jig by evilC_UK
Thingiverse.com
See Site
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Discussion

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sergetania   Apr 10, 2020  

Nice job! 👍Do you know how heavy the canopy is? Thanks!

evilC   Apr 12, 2020 
1

It varies hugely depending on how tough you want it (Wall count / infill settings). and whether you use thread inserts or not Anywhere from like 4g to 10g
I am finding that ~6g prints seem to strike about the right balance between weight and rigidity, but I am still experimenting with getting the weight down - however the build is about 80g (A BetaFPV Twig XL is over 100g though), so not really that fussed about 1-2g

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