Avant X3 EVO 3”

This quad has been built after that I have been scared of my 5” build. See build ID 30714 or URL https://rotorbuilds.com/build/30714

I have started to understand a few things now about building a quad, but far from being an expert in dimensioning or optimizing. A good friend of mine has recommended some parts, others are the result of my search. The frame and motors and the camera has been based on the suggestion from my friend.

AVANT X3 EVO frame, a small 3” frame that could still host a mini (!) camera. In blue carbon colour, very special looking frame.

Have opted for the DalRC F405 FC and matching 40A 4in1 ESC. This ESC could actually support BLHeli_32, which I could not understand anything by that time…

Trusted RunCam Swift 2 camera, FrSky D4R-II RX and Eachine VTX03 VTX. The usual suspects from my 5” build.

The motors have been the EMAX RS1306 3300 kv ones. These are very tall, 6 mm active length for the 13 stator diameter. Insane power on the top for the size, but I have driven them on a fairly tame battery setup.

Some challenges....

Yes, the battery. That has caused me some worries. I have opted for 3S 450 mAh 45C packs, since I had no idea of what I am doing and have thought that if these work on a superlight 3” setup, then they should surely work on a much heavier 3” setup of mine. Guess what, they did not…

My usual flight times have been around 1 minute per pack on just hovering and floating around. Basically, on a freshly charged pack the load for hovering has caused the cell voltage to quickly get to 3,8V. So almost done.
After some reading and discussions on forums I have learned that this size (weight) of a quad demands more like 3S 850 mAh packs. As a trial I have soldered myself a parallel adapter, which has kept the voltage at 3S, but the capacity has been doubled to 900 mAh. And the quad has started to work!!! So I have got myself some Tattu 3S 850 mAh 70C packs and all was good.

With this quad I have started to fly more controlled, then gradually left the world of STAB and got into AIR-mode. A very stable and forgiving quad, has flown beautifully, actually.

Have sold this one, together with the 5” quad, when I have had my big rethink…

Some flights...