Source One v3 7" HD Deadcat - DJI Air Unit

By wrong17 on Jul 02, 2021

18  807  3

This build is inspired by the multi color TPU 3D printing that I started to do. I used my favorite platform, the TBS Source One v3 frame with 7" deadcat arms.

Maiden Flight

3D Printing the TPU Parts:

I used Cura v 4.9.1 to slice the STL files and for the filament change (Extensions > Post Processing > Modify G-Code > Filament Change).
Since I only have a single printhead 3D printer, I have a manually switch filaments every time I change colors. So, it took a while to print some of these parts.

When printing with a .3 layer height, here are the specific layers where I changed the filament colors.
It is very important that you set the layer height to .3 or else the numbers I list below will not work for you.

TBS_Source_One_Arm_Protector_1_SLIM v11 Done.stl
07 Black
09 Blue
16 Black
18 Green
30 Black
32 Blue

9 Black
11 Blue
16 Black
18 Green

XT60 v4 GPS.stl
35 black
37 blue
62 black
64 green
90 black
92 blue
132 black
134 green

Squirt GP 25deg Mount v17.stl
22 Black
24 Blue
41 Black
43 Green

Quad Setup

For the PIDs and Filter setting please take a look at the image gallery for the screen shots. In addition to those settings I also have Bidirectional DShot turned on and the following Betaflight presets applied:

HD (smoothed FF for HD cameras, strong low turn rate smoothness, low iterm relax to minimise bounce back)

set iterm_relax_cutoff = 10
set rc_smoothing_auto_smoothness = 20
set ff_interpolate_sp = AVERAGED_3
set ff_smooth_factor = 40
set ff_spike_limit = 55
set ff_boost = 0
set feedforward_transition = 40
set yaw_lowpass_hz = 70
set throttle_boost = 5
set throttle_boost_cutoff = 10
set dyn_lpf_dterm_curve_expo = 7
set gyro_rpm_notch_q = 800

Vbat Compensation

set vbat_sag_compensation = 100
set vbat_pid_gain = off


Part List


RDQ Source One V3 Long Range 7" Frame Kit - 6mm V0.2 DeadCat Arms (15 builds)

Flight Controller

Hobbywing XRotor Micro 3-6S 30x30 Stack/Combo (F4 FC / 32Bit 60A 4in1 ESC) (13 builds)


4 x EMAX ECO II 2807 Brushless Motor - 1300KV (5 builds)


HQProp DP 7X3.5X3 V1S PC Propeller (Set of 4) (5 builds)

FPV Camera

Caddx DJI Digital HD FPV Air Unit Kit (288 builds)
See Site


iFlight Albatross 5.8GHz LHCP RP-SMA FPV Antennas (Set of 2pcs) (3 builds)


TBS Crossfire Nano Rx Special Edition FPV Long Range Drone Receiver (159 builds)


Team BlackSheep TBS TANGO 2 V3 PRO RC RADIO (104 builds)


DJI Goggles 2 (7 builds)

3D Printed

TBS Source One v3 HD Kit w/ XT60 Antenna GPS Mount - Caddx Vista Nebula Pro Holder - GoPro 5/6/7 & 9 Mount by wrong17 (3 builds)
See Site

HD Camera

GoPro Bones - HERO10 Black (FPV Lightweight Drone Camera) (3 builds)
See Site


2 x Tools for FPV (57 builds)

Misc Parts

DJI FPV Goggles Air Unit MMCX elbow to SMA Cable Part 07

Misc Parts

TBS M8-2 GPS Glonass (3 builds)

Battery Charger

HOTA F6+ 1000W 60A 1-6S Quad Channel AC/DC Smart Charger - Grey

Battery Charger

HOTA D6 PRO Dual Charger 1-6S AC200W/DC650W 15A w/ Wireless Cellphone Charging - Black (14 builds)

Soldering Iron

TS100 Portable Programmable Smart Soldering Iron (264 builds)


Lowepro QuadGuard BP X3 - Drone Backpack for 4 FPV Quad Racing Drones and 15" Laptop w/Exterior Mounts (Black)


iFlight Crystal HD Patch and Stubby 5.8GHz RP-SMA Antenna Set for DJI - LHCP - Carbon
Show stores (9)


Sign in to comment

gitareest   Sep 21, 2021  

You've made beautiful build! So clean and steady!
How do you like 1700kv motors with 6s battery? How much current is there? Especially during power loops (cool rip on the video btw)?
It seems you use Betaflight? Could you please share your config?
Also could you please specify weight? Would be much appreciated.

wrong17   Sep 21, 2021 

Thanks. Take a look at this build I did that has a lot more info about weight. The weight of this build (yellow blue & black stripes) is a bit more than my other 7" inch because of all the TPU, DJI air unit, and dual Antenna (I sold this quad so I can not get the exact weight for you). Some of my other builds ranges between 480g to 550g dry (not including the GoPro or battery).

As for 1700kv motors on a 6s 7" build, I think the KV is way too high. I tried using 2507 1850kv motors on a 7" Floss 3.0 frame and end up setting a throttle output limit to 70%. That would make the motors similar to 1300KV. You can check out that build here:

I am not really sure what the amp draw is during a power loop. In the past when I was using an analog system, i was able to record everything on the OSD. Since I am using DJI now, none of that info is saved. The only time I pay attention to amp draw is when I fly with a Lithium Ion battery, so I normally do not pay attention to it, sorry.

Sure, I can share my PIDs and Filters setting. Give me sometime to pull that off the quad.

wrong17   Sep 21, 2021 

I just added the PIDs and Filter setting screen shots and Betaflight presets to this build.

Guides & Reviews

Jun 21, 2021

AirbladeUAV has done it again and this time they've brought long range to the 5" class! Based on the popular Transformer Mini, the new Transformer 5" Ultralight adopts a lot of the same design philosophies with larger props and more payload capacity. It can fly upwards of 20 minutes on a 4 cell Li-Ion battery pack and in ideal conditions it's got a range of over 4 to 5 miles. In this guide I'll walk..

Read more
Mar 04, 2021

With the release of the DJI FPV Drone cinematic FPV has become a lot more accessible, but you certainly don't want to crash a $750 drone! The QAV-CINE Freybott is a compact, lightweight cinematic FPV drone that can take a hit and keep going. It's a lot safer to fly indoors and around people. With a naked GoPro or the SMO 4k you can capture some great stabilized footage. In this guide I'll show you..

Read more