Black KISS --- 5" Marmotte DJI / bolted AirUnit / FETtec

By MamaJOE on Aug 20, 2021

10  182  4

Betaflight is cool, but I wanted to try something new - my first KISS build.
It's 4S but prepared for 6S.
The goal was to build the counterpart to my 5" Rat Quad ( ) -clean, lightweight and without zip ties...

It flies very smooth and powerful, but there are still some tuning issues to work on.

Primarily I planned to use the Karearea TOA 2207 bi-turbine motors, but they are out of stock at the moment.
Therefore I used the Xing2 2306 2555 KV and made it 4S but prepared everything (cap, spike absorber, 12 V BEC) to change to 6S the day the TOA 2207 are back in stock.
The Marmotte frame is great, but I don't like the proposed mount of the AirUnit, so I build my own adapter (see photos).
This adapter is, what I was able to manufacture within one hour without special machinery. It could be more handsome and more lightweight but it works and the weight of 5 g isn't too bad.
Why I used aluminum? First I'm a bit old-fashioned and not so adored to 3D printing but the aluminum will also support the heat dissipation!

I decided to use FETtec components for the ESC and FC.
It was an odyssey to get one of these FETtec FCs...but finally I got one from Israel ;)

I'm always keen on finding some custom solution for every build.
On this build I outsourced the spike absorber and cap to a cage for the XT60 plug.
Furthermore I mount the Crossfire antenna at the tail... I'm not sure, if this is a good solution - what do you think?
To illuminate the machine room, I used two LED strips, mounted to the underside of the top plate.

To get the weight below 400g, I used titanium screws where possible.

Weight with props: 399 g
AUW with 4S 1500 mAh: 580 g


Part List


Top Plate Nano 2-5 Frame


Armattan Marmotte DJI Edition (3 builds)


Extra Plate (2pcs) Freestyle 5-10 Frame

Flight Controller

FETTEC KISS F7 FC V1.2 20x20mm-30x30mm (31 builds)


FETtec 45A V1.2 3-6S 30x30 4in1 ESC (13 builds)


4 x iFlight XING2 2306 1755KV 2555KV 3-6S Brushless Motor for 5 Inch 5.1 Inch 6 Inch RC Drone FPV Racing (2 builds)


HQProp Durable 5.1X4.1X3 Light Gray

FPV Camera

DJI Digital HD FPV Air Unit (238 builds)




iFlight Sigma 5.8GHz 60mm RHCP / LHCP FPV Antenna MMCX / UFL for FPV Racing Drone Quadcopter DJI Digital FPV (LHCP MMCX 90° Bl (4 builds)


TBS Crossfire Nano RX FPV LONG RANGE DRONE RECEIVER (1154 builds)


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)

Power Distribution

2 x FETtec Race Wire 6 (2 Stück) (2 builds)

Power Distribution

FETtec Spike-Absorber (8 builds)

Power Distribution

iFlight 5V/12V Step-Down Voltage Regulator 2-8S Micro BEC kaufen |


Gaoneng GNB 7,4 V 3000 mAh 5C 2S Lipo Batterie XT30 Stecker für Jumper T16/T18 RADIOMASTER TX16S Sender


RadioMaster TX16S Multi-Protocol RF Module OpenTX 2.4GHz RC Transmitter w/ Hall Gimbals (69 builds)


URUAV V2 3 in 1 Dust-proof Shading Sheet Protective Lens Cover for DJI Digital FPV Googles


DJI Digital HD FPV Goggles (102 builds)


iFlight Crystal HD Patch 5.8GHz RP-SMA Antenna for DJI - LHCP - Choose Your Design (2 builds)


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


Replacement DJI FPV Goggles Sponge Foam Padding


Ersatz Akku Li-Ion 4,4Ah (4 * 18650 Akku) + Tasche für - - und andere LED-Lampen mit 7,


CopterFarm Cow Tongue Pad Marmotte 5 Zoll Batterie LiPo Super Sticky


ISO 7380 M3 Titan schraube M3x20 M3x22 M3x23 M3x24 M3x25 M3x26 M3x27 M3x28 M3x30 M3x32 M3x35 Taste Kopf Hex 2,0 fahrer Ti GR2

Misc Parts


Misc Parts

Matek Lost Model Beeper & FPV FC 5V Loud Buzzer (29 builds)

Misc Parts

FETtec Tiny LED Stick (2 Stück) (2 builds)

Misc Parts

Plasti Dip Liquid Electrical Tape schwarz 118ml 4oz black (3 builds)

Radio Module

TBS Crossfire Micro TX V2 (36 builds)

Battery Charger

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

Battery Charger

2 x BAT-Safe LiPo Tresor sicheres Laden und Aufbewahren der Akkus

Battery Charger

2 x Amacoam 2 Stück Lipo Batterie Sicherer Beutel Feuerfeste Explosionsschutz Lipo Battery Guard Tasche Sack Gebühren Schutz Tasch

Battery Charger

ISDT D2 200W 24A AC Dual Channel Output Smart Battery Balance Charger (17 builds)

Soldering Iron

Tilswall Lötstation 65W Lötkolben Set 200°-480°, mit 5 Ersatzspitzen und Lötzinn, einstellbarer Temperatur, eingebaute Tran (2 builds)


Skyreat Hard Carrying Case for DJI FPV V2 Goggles


Tarion Pro PB-01 Professional Camera Backpack


Kesser® Campingstuhl faltbar klappbar tragbar Angel Stuhl Camping Stuhl Faltstuhl bis 120 kg Strandstuhl Angelstuhl Klapphocker
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Sign in to comment

baggszilla   28 days ago  

Nice build! I love how you mounted the Air Unit. Very clever, Cheers.

MamaJOE   28 days ago 

Thanks for the kind words! It has bothered me for a long time that the Air Unit has no mounting option. Since adhesives or cable ties were not an option on this build, I had to come up with something. I am happy with the solution to have the air unit well ventilated and removable fastened 👍

Jodie Froster   Aug 25, 2021  

Slick bracketry, I like that you tapped the air unit!

MamaJOE   Aug 25, 2021 

Thanks! Yes, modifying the air unit with mounting holes fixed the biggest downside of the air unit, besides the weight of course...
Vista with sound recording would (almost) be perfect!

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