50A 3-6S Speedybee F405 V3 Flight Controller, Factory Supply, MOQ Flexible, Fast Worldwide Shipping

We've been running these on our fixed-wing mapping drones for the last few months, and what it does is give you solid PID tuning stability at altitude without the drift you see on some cheaper boards—basically, the BMI270 gyro handles vibration much better than the older MPU sensors in my experience.

MCU is the STM32F405, 9.6 grams total weight on the scale, 41.6mm by 39.4mm footprint, so it slides into a 30.5mm stack just fine as long as your frame has the 4mm mounting holes. Built-in barometer and BLE bluetooth are handy for quick parameter tweaks without pulling out a laptop, and the Type-C port is actually standerd, not teh mini-USB that keeps breaking on field setups.

This is really for industrial fixed-wing use, not racing quads—you'll want something lighter if you're building a 3-inch freestyle drone. Most buyers go with the 10-unit minimum for testing, which is what we're doing for our new long-range payload tests, and the 3-7 day lead time (usually 3 days if stock is solid) is consistent.

We ordered 120 units or so because the price works out to roughly $28 each at that volume, and the MOQ flexibility means our company can adjust for next batch without committing to 500 right away—better than reagent grade clone boards that arrive with no COA. Origin is China, FCC and CE certified per the spec sheet, but confirm lead time for orders above 1000 since they consolidate shippng for bulk.

One detail worth mentioning: the barometer is built-in and works well for altitude hold, but if your setup uses ultrasonic sensors for precise landing you'll probably still need an external module for that. Actually, I've found it's better than the F722 for sustained high-altitude runs, the INAV support is cleaner for fixed-wing configs.