The DJI O4 Pro Air Unit does not fit with stock 6.4mm Kayou standoffs, you will have to get M3x20mm 5mm diameter ones, easy to grab on Aliexpress.

When it comes to motors, we're looking for sturdiness, but also torque and precision, so you can control your quad perfectly !

Here's what you need to know to make your choice:

Sizes, 

• 2306: More precision at the bottom, more linear throttle curve due to its greater width (but no less powerful!)

• 2207: More responsive

In practice, the difference between a 2306 and a 2207 is almost invisible, and even the best pilots are unable to distinguish them blindly.

So concentrate instead on the kv, which makes a real difference:

• 1700-1800kv: Less power-hungry, more precise, more baz gas torque but less "top end", recommended for bando or spots requiring precision. This is the range we recommend for the Kayoudur.

• 1900-2000kv: Lipo destroyer, ideal for Open Field where you'll have a real interest in using full throttle, as it's in the "top end" that high kv motors stand out by climbing very high in the revs.

In Freestyle, we're looking for reliability, but also low cost, 2 points that don't usually go together. 30x30 stacks are mandatory to maximize reliability.

Still, to hit concrete, you don't go for an Overkill stack like you would in Long Range, the goal being to be able to change it if you fry it without having to mortgage your house.

We'll be looking for a fairly high pitch with good punch, your best shot it to try out a few models to get an idea of which ones you like the best.

If you're flying without a GoPro, with a DJI O4 for example, propellers like the Gemfan F3S and Ethix P3 are more suitable for lighter builds and will let you enjoy more precision and less propwash.

Just like for the video: it will obviously depend on your transmission protocol you're using : ELRS receiver for ELRS protocol, Crossfire receiver for Crossfire protocol etc.