Biton --- Marmotte DJI / upside-down Holybro Metal ESC / Karearea 2207 Bi-Turbine

By MamaJOE on Dec 10, 2021

5  185  0

The story behind the build

This bulid evolved from my Black KISS build (https://rotorbuilds.com/build/27966).
Here I actually planned already to use the Karearea TOA 2207 1980 KV Bi-Turbine motors, which wheren't available at this time.
After I got some, I had to update!
But with my Black KISS, I had bad problems in the meantime.
Overall it flew great, but it still had some twitches and uncommanded movments, what scared me.
I blamed the FC and/or ESC to be the problem, but I think I was was wrong...

Choice of components

The motors were already specified.
Than I really fell in love with this Holybro 65 A metal-monster ESC, so I want one.
The videosystem and the frame where the only things, I took from my old build.
For the FC I wanted a iFlight F7 with dual-gyro, because I already have one (mini) running and I love it.

Building

This build was a bit boring, because I already made it once.
To complicate it a bit, I tried an upside-down mounted ESC, to have a special wire routing.
The mount of te Immortal T at the back turned out to be useful, so I did it again.
I didn't really like the cage for the cap and spike absorber, like I had it before. That's why I removed it and outsourced the component's into the back of the copter.

Flight quality

Well, it flies good...but I had the same problems (more or less) than before - uncommanded movements!
After some research, I'm pretty sure the problem is the frame or more it's vibration characteristics.
Find the answer here:


With a little bit more (precise) filtering, it flies good, but not that great what I expected of a quad, built of top notch components.

The Karearea motors also where a bit disappointing. The look worthy, got a lot of power (max. 3400 W for all four acc. to BF OSD) and work great. But two of five had a noticeable bearing clearance out of the box.
In BF these motors show acceleration forces > 1 g. Not really what I expect from a premium motor.

Update:

I found out, the bearing play is caused by too little axial prestress on the bearings.
So I shortend the drive shaft by some µm and now the motors are running perfectly smooth, without any play or additional heat generation.

Data

Weight with props: 433 g
AUW with 6S 1050 mAh: 613 g
AUW with 6S 1400 mAh: 659 g
Flight time (1050 mAh): approx. 2:30 to 4:30
Flight time (1400 mAh): approx. 3:00 to 6:00
v_max: 175 km/h (straight flight, with constant altitude)

Photos

Part List

Frame

Armattan Marmotte DJI Edition (8 builds)
N-factory.de
$105.62

Flight Controller

iFlight SucceX-D F7 V2.2 TwinG FC (2 builds)
Rctech.de
$65.79

ESCs

HOLYBRO Tekko32 F4 Metal 4in1 65A BLHELI32 128K ESC 4 6S 30.5X30.5mm for RC FPV Racing Freestyle Drones Replacement DIY Parts (5 builds)
Aliexpress.com
$95.53

Motors

4 x TOA BI-TURBINE 2207 (V2) | kareareadrone (2 builds)
Kareareadrone.com
See Site

Propellers

Azure Power Vanover Limited Edition 5.1x4.5x3 POPO Compatible Tri-Blade 5" Prop 4 Pack - Choose Your Color (7 builds)
Racedayquads.com
$3.29

FPV Camera

Caddx DJI Digital HD FPV Air Unit Kit (167 builds)
Getfpv.com
See Site

Antenna

TBS CROSSFIRE IMMORTAL T V2 ANTENNA (123 builds)
Pyrodrone.com
$5.95

Antenna

DJI FPV Air Unit Antenna MMCX 90° 2PC (10 builds)
Customquads.com.au
$25.00

Receiver

TBS Crossfire Nano Rx - FPV LONG RANGE DRONE RECEIVER (1328 builds)
Team-blacksheep.com
$24.95

Batteries

Tattu R-line Version 4.0 1400mah 6S 130C Lipo Battery Pack (12 builds)
Pyrodrone.com
$39.99

Batteries

Tattu R-Line Version 4.0 22.2V 6S 1050mAh 130C LiPo Battery - XT60 (19 builds)
Racedayquads.com
$33.99

Power Distribution

Diatone Sanyo 2000uF 35V Low ESR Kondensator Board mit 2 blauen LED (4 builds)
Fpv1.de
$1.94

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
$48.42

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
$0.97

Hardware

CopterFarm Super Sticky Cow Tongue Pad Batterie LiPo (6 builds)
Copterfarm.de
$5.77

Misc Parts

Matek Lost Model Beeper & FPV FC 5V Loud Buzzer (33 builds)
Racedayquads.com
$5.49

Misc Parts

FETtec Spike-Absorber (15 builds)
Fettec.net
$4.98

Misc Parts

Plasti Dip Liquid Electrical Tape schwarz 118ml 4oz black (8 builds)
Plastidip-sale.com
$13.95

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
$116.26

Battery Charger

2 x Amacoam 2 Stück Lipo Batterie Sicherer Beutel Feuerfeste Explosionsschutz Lipo Battery Guard Tasche Sack Gebühren Schutz Tasch
Amazon.de
$44.56

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
$116.18

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
$48.44

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
$31.78
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