Quadimodo - the Rat Quad

By MamaJOE on Aug 13, 2021

4  146  2

Yes, this build is fat and ugly - but I love it :)
It's my everyday 4S copter which has to accept a lot of misuse and is held together with zip ties and epoxy.
But he's doing a good job!

I bought it as an used analog build and started modifying.
To get room for the DJI AirUnit, I used a Lipo top plate to extend the frame.
Then I changed the FC, Antennas ect...
This build is pretty heavy (AUW 678 g) but it's well balanced / tuned and flies great!
I use relatively low filters on Betaflight, the ESC is flashed with JESC firmware for RPM-filters and 48 kHz.
To kill the electrical noise, I use a lot of caps. 3x 330 µF (50 V) for battery and 2x 1000 µF (10 V) for the 5V BEC.
The motors are softmounted with o-rings. This allows me to align the props perfect, even when the frame is bent a bit.
The motor wires are connected with Amass MT30 plugs, for quick motor replacement.

In a hard chrash one arm delaminated. I fixed it with two cam braces and some epoxi resin and it's perfectly stiff again.

Perhaps you like this "different" build and gain some ideas...let me know!

Flight time is between 3:30 and 8:00 with 4S 1500 mAh.
Weight dry: 493 g
AUW with 4S 1500 mAh: 678 g
v_max: 130 km/h (straight flight, with constant altitude)

Photos

Part List

Frame

Chameleon Lipo Top Plate
Armattanquads.com
$8.00

Frame

Armattan Chameleon FPV Frame 5" (160 builds)
Getfpv.com
$79.99

Frame

Chameleon Cam Braces for 3 hole cams (2 pieces) (3 builds)
Armattanquads.com
$7.75

Flight Controller

T-Motor F7 Flight Controller (2 builds)
Droneshop.nl
$62.95

ESCs

Hobbywing Xrotor Micro 40A 4-in-1 BLHeli-S DShot600 ESC
Getfpv.com
$49.99

ESCs

JESC Firmware x 4 (7 builds)
Jflight.net
See Site

Motors

4 x EMAX 2306-2400KV RS Special Edition Motor (87 builds)
Getfpv.com
$79.96

Propellers

HQProp Ethix S4 Lemon Lime Props (Set of 4) (3 builds)
Getfpv.com
$3.59

FPV Camera

Caddx DJI Digital HD FPV Air Unit Kit (168 builds)
Getfpv.com
See Site

Antenna

TBS CROSSFIRE IMMORTAL T V2 ANTENNA (125 builds)
Pyrodrone.com
$5.95

Antenna

Lumenier AXII 2 MMCX 5.8GHz Antenna (LHCP)
Drone-fpv-racer.com
$21.39

Antenna

TrueRC Singularity 5.8GHz MMCX 90° Antenna - LHCP
Drone-fpv-racer.com
$21.39

Receiver

TBS Crossfire Nano RX FPV LONG RANGE DRONE RECEIVER (1331 builds)
Pyrodrone.com
$24.95

Batteries

GOLDBAT Champ Series RC Battery 1500 mAh 14.8V 4S 120C LiPo Battery Pack with XT60 Stecker for RC car Boat Truck Helicopter Airp (2 builds)
Amazon.de
$28.31

Power Distribution

5pair AMASS MT30 2mm 3 pin Stecker/Motor stecker/Stecker Set für RC Lipo Batterie RC Modell Quadcopter Multicopter
De.aliexpress.com
$4.35

Power Distribution

2 x PANASONIC EEUFR1A102 KONDENSATOR, 1000F, 10V, 20%
Develektro.com
$2.04

Power Distribution

3 x Panasonic 330uF 50V FR Ultra Low ESR Capacitor (2 builds)
Hobbyrc.co.uk
$3.33

Radio

RadioMaster TX16S Multi-Protocol RF Module OpenTX 2.4GHz RC Transmitter w/ V3 Hall Gimbals (82 builds)
Racedayquads.com
$199.99

Radio

21700 5000mAh Battery for TX16S
Radiomasterrc.com
See Site

Goggles

URUAV V2 3 in 1 Dust-proof Shading Sheet Protective Lens Cover for DJI Digital FPV Googles
Uruav.com
$7.55

Goggles

DJI Digital HD FPV Goggles (125 builds)
Getfpv.com
$529.00

Goggles

iFlight Crystal HD Patch 5.8GHz RP-SMA Antenna for DJI - LHCP - Choose Your Design (4 builds)
Racedayquads.com
$44.99

Goggles

2 x Double Quad RX Black Edition LHCP RP-SMA male speziell fr DJI HD FPV System (2 builds)
Antennenfreund.de
$48.82

Goggles

Replacement DJI FPV Goggles Sponge Foam Padding
Shop.iflight-rc.com
$11.99

Goggles

Ersatz Akku Li-Ion 4,4Ah (4 * 18650 Akku) + Tasche für Magicshine.eu - bikelight.eu - LED-Fire.com und andere LED-Lampen mit 7,
Amazon.de
$0.98

Misc Parts

2 x Matek 2812 LED STRIP, SLIM (2 builds)
Pyrodrone.com
$9.98

Misc Parts

LiPo Protection Carbon Plate 85mm
Amaxshop.com
$3.49

Misc Parts

16 x O-ring 3x2 mm Silikon 70 Shore A
Technirub.de
$13.60

Misc Parts

16 x O-Ring 3x1,5 Silikon (VMQ) Shore A Blau ORSV2-3x1,5-VMQ-
O-ring-lager.de
See Site

Radio Module

TBS Crossfire Micro TX V2 (43 builds)
Getfpv.com
See Site

Battery Charger

2 x Power Genius SAFE Parallel board XT30 and XT60 2S to 6S with Fuse Protection (3 builds)
Pyrodrone.com
$19.98

Battery Charger

2 x BAT-Safe LiPo Tresor sicheres Laden und Aufbewahren der Akkus
Amazon.de
$117.18

Battery Charger

2 x Amacoam 2 Stück Lipo Batterie Sicherer Beutel Feuerfeste Explosionsschutz Lipo Battery Guard Tasche Sack Gebühren Schutz Tasch
Amazon.de
$44.90

Battery Charger

ISDT D2 Mark 2 200W 12A Netzteil Lipo Akku Batterie Balance Ladegerät Entlader AC DC Dual für Rc Modelle 1-6S Li-ion Life NiCd
Amazon.de
$117.10

Soldering Iron

Tilswall Soldering Station, 65W Solder Station Welding Iron with Smart Temperature Control (392°F-896°F), Extra 5pcs Sol (2 builds)
Amazon.de
$48.82

Backpack

Skyreat Hard Carrying Case for DJI FPV V2 Goggles
Getfpv.com
$19.99

Backpack

Tarion Pro PB-01 Professional Camera Backpack
Tarion.eu
$149.99

Accessories

ETHIX Heated Deluxe Lipo Bag V2
Team-blacksheep.com
$64.95

Accessories

Kesser® Campingstuhl faltbar klappbar tragbar Angel Stuhl Camping Stuhl Faltstuhl bis 120 kg Strandstuhl Angelstuhl Klapphocker
Amazon.de
$32.03
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Discussion

Sign in to comment

Jodie Froster   Aug 14, 2021  
1

I have always thought that the 3 pin xt30 for a quick connect motor assembly was a great idea. You are one of only 3 people that I have seen take advantage of that PERFECT connector.
You have so many capacitors, did you add them 1 at a time until you didn't have static in your video?
What is the foam on either side of the air unit for? Is it to keep grass clippings out of the ports on the side?

MamaJOE   Aug 15, 2021 

I concur, these 3-pin XT30 connectors are perfect for the motor connection - they also protect your wires against being teared out of the ESC 🙈 But for super lightweight and clean builds they are to big and unstylish...
The caps are not installed because of video noise - I think digital is unproblematic in this aspect. But I bought a bunch of Panasonic FR caps with 50 V rating because I want to use them for 6S also. The downside is that they are big compared to the capacity. Why I use three of them? I just want to come somewhere round 1000 µF, that's all...
For the 5 V BEC it's another story. Here I had massive electrical noise on the gyro signal, caused by the LEDs (I think the ampdraw of the 32 LEDs is just too much for the BEC). So I experimented with caps to get rid of this noise and 2x 1000 µF worked well. To find out, I armed the copter and connected different caps until there was no noticeable influence of the blinking LEDs to the motor idle.
The ugly foam at the side of the AirUnit keeps the dirt out of the ports, but more important it reduced the wind noise of the props. So the sound recording of the AirUnit is much better!

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