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

By MamaJOE on Apr 26, 2022

15  890  4

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.


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!


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)


Part List


AOS 5 V2 (4 builds)

Flight Controller

Mamba interference shielding FPC (3 builds)

Flight Controller

Kakute H7 (5 builds)
See Site


4 x Tekko32 F4 4in1 50A ESC
See Site


4 x iFlight Xing2 2207 1855KV 6S Race Motor
See Site


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

FPV Camera

CADDXFPV Air Unit Micro Version
See Site


TBS Crossfire Immortal T V2 Antenna (149 builds)


2 x Lumenier AXII 2 5.8GHz Straight MMCX Antenna - Choose Your Polarization (12 builds)


TBS Crossfire Nano Rx - FPV LONG RANGE DRONE RECEIVER (1491 builds)


Tattu R-line Version 4.0 1400mah 22.2V 6S1P 130C Lipo Battery - XT60 (15 builds)

Power Distribution

5 Paar 10 Stück Premium MR30 R30 Original Amass 3Pin 3Pol Goldstecker Stecker Buchse für Multirotor Brushless Motor Hochstrom
See Site

Power Distribution

Diatone Sanyo 2000uF 35V Low ESR Kondensator Board mit 2 blauen LED (4 builds)
See Site

Power Distribution

SoloGood Amass 20 Pair XT60H Bullet Connector Plug Black Male Female (XT60 Upgrated) with Sheath for Lipo Battery RC Plugs (2 builds)


CopterFarm Super Sticky Cow Tongue Pad Batterie LiPo (7 builds)
See Site


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


Matek M3 Softmount FC Vibrationsdämpfer für Flugsteuerung
See Site


Taste Kopf M2 Titan schrauben M2x3 M2x4 M2x5 M2x6 M2x7 M2x8 M2x10 M2x12 M2x14 M2x16 M2x18 M2x20 Hex Fahrer Ti GR2 QCTI Schraube (5 builds)


2 x RC-Hangar15 Antirutsch Lipostrap 16x250mm, Kevlar, Metallse (3 builds)
See Site

Misc Parts

HGLRC M80 Pro GPS Module for FPV Drone Racing (3 builds)

Misc Parts

Plasti Dip Liquid Electrical Tape schwarz 118ml 4oz black (9 builds)

Misc Parts

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


Sign in to comment

Rayz   Jan 17, 2023  

What a great build. I really like your attention to detail, and how you used the rubber O-rings to secure the wiring.

MamaJOE   Jan 17, 2023 

Thanks for your comment!
Yes, I don't like zip ties so much for aesthetic reasons, so I watched out for an alternative and found O-rings a good option.

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

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