Recommended Parts
For SMALL AOS drones:
AOS 3.5
AOS Cine25
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MOTORS
BrotherHobby VY 1504.5 2650KV/2950KV/3950 KV Motor
3.5" Freestyle benefit from a slightly larger motor. 1504/1505 is my recommendation and Brotherhobby has a good reputation for quality and performance. 2950KV on 4S is my recommendation.
iFlight XING2 1404 3000KV/3800KV/4600KV Toothpick Motor
iFlight's XING2 motors are the state-of-the-art in FPV right now. Slotted magnets, unibell design, titanium shaft and protective o-ring for the bearings. 3000KV on 4S is my recommendation.
Diatone Mamba Toka 1404 Motor - 3000KV/4000KV
1404 motors are perfect for 2.5" Cinewhoops or 3" Freestyle/Racing quads. These Mamba motors from Diatone look great and perform very well. 3000KV on 4S is my recommendation.
PROPS
HQProp Duct-T63MMX3 3-Blade Propeller - Light Grey (Set of 4)
2.5" Cine Whoop props need to pack a lot of thrust into a small space. This bullnose design from HQ will give the right amount of performance for lifting a naked Go Pro and larger battery for longer flight times. Can be used with or without ducts.
HQProp T3.5X2.5X3 Propeller (Set of 4)
HQ make fantastic props that often come out top in my testing across many different sizes. This is a great choice for 3.5" freestyle with minimal propwash and good efficiency.
EMAX AVAN Scimitar 3.5x2.8x3 Propeller (Set of 4) - Red
This is the prop I recommend for the AOS 3.5. It is well matched to a 1504/1505 size motor with minimal propwash and plenty of top end thrust and power.
FC + ESC
JHEMCU GHF405 Pro AIO - F4 FC + 25A 3-6S BLHeli_S ESC
For smaller drones this 25A rated AIO is a great choice at a great price point. 4K PID loop is recommended for F4 processors with MPU gyros. Flash BlueJay to the ESC to support bidirectional Dshot.
Flywoo GOKU GN405S AIO - F405 BMI 270 FC + 40A BLHeli_S ESC
Flywoo make fully featured flight controllers at a sensible price point. You don't need more than an F405 processor to run the BMI 270 gyro (3.2K PID loop rate) and the BMI270 at 3.2K performs better than MPU6000 at 8K for Betaflight. Flash BlueJay to the ESC and you are good to go!
iFlight Beast F7 V2 55A AIO 25.5x25.5 mm Flight Controller
Drones smaller than 5" should prioritise a 25mm AIO for ease of build and weight. This iFlight Beast F7 AIO has a 55A rating (more than enough for any drone with smaller than 5" props. It also has all the connections and functionality you could want on a Betaflight flight controller. A premium offering from iFlight but not the cheapest option available.