Drakula 2" HD Walksnail

By JustVic on May 31, 2024

4  0  2

Drakula 2" HD walksnail build
After receiving my first analog Mobula 8 and breaking the stock ELRS antenna, I began creating and couldn't be stopped.
Here, I share my experience of transitioning from the Mobula 8 to the Drakula (DRAKnight + MobULA) using the Draknight frame from HGLRC with the excellent HD system from Caddx Walksnail Avatar Mini 1S Kit.

Initially, I wasn't sure what to do about the missing ELRS antenna. I soldered a wire in place of the antenna, and it worked wonderfully, allowing the analog Mobula to fly again. However, I started considering switching to digital and realized I needed an external ELRS antenna. To achieve this, I had to solder a UFL connector where the stock antenna was.

I also desoldered the power for the built-in analog VTX. Since this AIO uses SPI for ELRS, I had a free UART which I used to connect a GPS. I experimented with different video antennas, starting with the "green" small antenna, which allowed me to reach a distance of 1 km. However, I felt the drone was still blocking the signal, so I decided to use the stock Walksnail antenna, but I shortened it a bit since it was too long.

Photos

Part List

Frame

HGLRC Draknight 2inch Ultra light FPV Toothpick Frame Kits 91mm Wheelbase for FPV Freestyle 2inch Outdoor Indoor Drones (2 builds)
Vi.aliexpress.com
$16.05

Flight Controller

Newest Happymodel X12 ELRS Pro v1.1 5 IN 1 AIO flight controller built in 2.4G ELRS V3.0 / 400mW OPEN VTX / 12A ESC/ OSD
Vi.aliexpress.com
$96.03

Motors

4 x Happymodel Ex1103 Kv11000 1-2s Brushless Motor Replacement For Bassline 2s Micro 90mm Fpv Drone Diy Parts - Parts & Accs - AliEx
Vi.aliexpress.com
$44.00

Propellers

4Pairs Gemfan Hurricane 2023 2X2.3X3 3 Blade Toothpick Propeller 1mm 1.5mm for RC FPV Racing Freestyle 2inch Toothpick Drones
Vi.aliexpress.com
$1.39

FPV Transmitter

CADDX Walksnail Avatar HD Mini 1s Kit/Mini 1s Lite Kit V3 VTX 1080P for FPV Drone
Vi.aliexpress.com
$144.66

Antenna

2PCS FlyFishRC Osprey 5.8Ghz 40mm Ipex UFL LHCP Stubby Antenna Compatible Caddx VISTA Polar Nebula Digital HD FPV System
Vi.aliexpress.com
$18.24

3D Printed

Draknight ELRS antena mount by JustVictor
Thingiverse.com
See Site

3D Printed

Draknight GPS mount by JustVictor
Thingiverse.com
See Site

3D Printed

Draknight video antena mount by JustVictor
Thingiverse.com
See Site

Hardware

FlyFishRC M10 Mini GPS Module 10th Generation Built in Ceramic Antenna For FPV RC Freestyle Long Range Drone Parts
Vi.aliexpress.com
$22.26

Misc Parts

2pcs Elrs 2.4ghz Mini T Antenna Ipex1 Ufl 40mm 70mm For Ep1/ Ep2/nano Betafpv Super-d Receive Fpv Racing Drone Diy Parts - Parts
Vi.aliexpress.com
$1.39

Misc Parts

10PCS Active Buzzer 3V/5V/12V/16R TMB12A03 TMB12A05 TMB12A12 Magnetic Long Continous Beep Tone 12095 12*9.5mm Mini Plug Speaker (2 builds)
Vi.aliexpress.com
$0.55
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Discussion

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Tokyo_Dom   May 31, 2024  

That's sweet, with GPS too! How does it fly? It's a lot heavier than a stock mob8

JustVic   Jun 03, 2024 

Thanx. Of course, this can't compare to an analog Mobula, but I believe the analog version had too much power for its size, so I cut 30% of the throttle. Now it flies very well; there is a slight prop wash at high throttle (>80%), but it's minor. Regarding the GPS on this build, it's not perfect either. It works, but without a barometer, it struggles to determine the current altitude, and the return to home can take a while. Also, it seems like this processor can't handle GPS rescue well. When it returns home, it looks jerky, as if the PID filters are very poorly tuned.

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