Asterisk PI --- concept of plug-in units / Holybro driven AOS 5 V2

By MamaJOE on Apr 26, 2022

7  373  2

The story behind the build

I always try to make my builds as noisefree as possible to tune the BF filters and PIDs.
Sometimes it's not just for the flight performance but as a challenge.
So it was no question to build one quad with the most engineered frame in this aspect, the AOS.
I just wanted to wait for the second version because I believe in evolution :)

With this build I also wanted to realise a long-cherished wish to connect all (main)components pluggable.

Choice of components

Ok, the frame was set.
I am a big fan of the Xing2 motors, therefore no discussions... Size? I prefer 2207.
I also became a fan of the Holybro stuff, especially the ESCs. For FCs I follow the rule more power is better -> Holybro H7 stack
For the videosystem digital was set anyway. But I like the DJI Air Unit because I like the look, its rocksolid and it has sound recording which I find very helpful for tuning (I use no Gopro or something else).
The Azure Vanover are proofed by myself and I have less vibrations than with the most other brands.
For the VTX antenna I think the AXII is one of the best, although it is a bit bulky.
According to Chris Rossers doctrine, damping grease is a must have. I wasn't able to get some of this NyoGel type, but I got some Rocol Kilopoise 0868S which turned out to have at least a mensurable effect.

Building

I love the concept of this frame an really enjoyed the build.
But I don't like to fix things with double-sided adhesive tape, cable ties or something along those lines so it was a challenge to get the Air Unit into the frame.
To put the stack to the front or rear also was no option for me, so I got some headache....
I modified the Air Unit to fix it with screws, but the length was a problem. Finally I made it and nothing touches the FC directly, but the clearance between Air Unit and FC is less than 2 mm.
The concept of the pluggable components also worked, so I was very happy with the result.
It's a bit more messy than I expected but i'm ok with this - the goal was not to build the prettiest quad ever but an innovativ one.

Flight quality

I pre-tuned the filters according to Chris's recommendations: How to tune Betaflight 4.3 PIDs and Feedforward like a MAD SCIENTIST! Featuring the AOS 5 V2
and turned the masterslider to 1.5 for now. This setup is not at the edge, but the quad flies very good and stable!
I put a noisplot for the gyro scaled roll into the photos, this is a flight of app. 2:30 minutes with a lot of fullthottle, flips and rolls.
This build really has the potential to get my best flying quad!

Data

Weight with props: 399 g
AUW with 6S 1400 mAh: 626 g
Flight time (1400 mAh): approx. 5:00 to 8:00
v_max: 155 km/h (straight flight, with constant altitude)

Photos

Part List

Frame

AOS 5 V2 (3 builds)
Cncdrones.com
$69.00

Flight Controller

Mamba interference shielding FPC (3 builds)
Diatone.us
$1.99

Flight Controller

Kakute H7
Holybro.com
See Site

ESCs

4 x Tekko32 F4 4in1 50A ESC
Holybro.com
See Site

Motors

4 x iFlight Xing2 2207 1855KV 6S Race Motor
N-factory.de
$95.72

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 Air Unit Micro Version
Caddxfpv.com
$189.00

Antenna

TBS CROSSFIRE IMMORTAL T V2 ANTENNA (117 builds)
Pyrodrone.com
$5.95

Antenna

2 x Lumenier AXII 2 5.8GHz Straight MMCX Antenna - Choose Your Polarization (10 builds)
Racedayquads.com
$39.98

Receiver

TBS Crossfire Nano Rx - FPV LONG RANGE DRONE RECEIVER (1300 builds)
Team-blacksheep.com
$24.95

Batteries

Tattu R-line Version 4.0 1400mah 6S 130C Lipo Battery Pack (11 builds)
Pyrodrone.com
$39.99

Power Distribution

5 Paar 10 Stück Premium MR30 R30 Original Amass 3Pin 3Pol Goldstecker Stecker Buchse für Multirotor Brushless Motor Hochstrom
Amazon.de
$7.81

Power Distribution

Diatone Sanyo 2000uF 35V Low ESR Kondensator Board mit 2 blauen LED (4 builds)
Fpv1.de
$2.09

Power Distribution

Amass XT60H Bullet Connector Plug Upgrated of XT60 Plug Sheath Female & Male Black Plated for RC Parts Lipo Battery(20 Pairs
Amazon.com
$15.88

Hardware

CopterFarm Super Sticky Cow Tongue Pad Batterie LiPo (6 builds)
Copterfarm.de
$6.20

Hardware

ISO 7380 M3 Titan schraube M3x40 M3x44 M3x45 M3x50 Taste Kopf Hex 2,0 Treiber Ti GR2 Poliert QCTI Schraube (3 builds)
De.aliexpress.com
$4.18

Hardware

Matek M3 Softmount FC Vibrationsdämpfer für Flugsteuerung
Fpv1.de
$3.02

Hardware

Taste Kopf M2 Titan schrauben M2x3 M2x4 M2x5 M2x6 M2x7 M2x8 M2x10 M2x12 M2x14 M2x16 M2x18 M2x20 Hex Fahrer Ti GR2 QCTI Schraube (4 builds)
De.aliexpress.com
$2.19

Hardware

2 x RC-Hangar15 Antirutsch Lipostrap 16x250mm, Kevlar, Metallse (3 builds)
Shop.rc-hangar15.de
$4.18

Misc Parts

HGLRC M80 Pro GPS Module for FPV Drone Racing (3 builds)
Pyrodrone.com
$14.99

Misc Parts

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

Misc Parts

KILOPOISE 0868 - ITW Deutschland
Itwcp.de
See Site
Show stores (16)

Discussion

Sign in to comment

iversonwin   Apr 28, 2022  

with the center of immortal T inside the sandwich plate, do you have problems with range and failsafe?

MamaJOE   Apr 28, 2022 

Since the active parts of the Immortal T antenna are the ends, it shouldn't matter that the antenna itself is clamped between the carbon plates. Till now everything is fine.
Regarding the range, definitively the VTX's range is still the limiting factor

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