JHEMCU GHF420AIO Review: Probably time to stop buying 20mm stacks now for micros

The JHEMCU GHF420AIO is an All In One (AIO) board that combines a F405 flight controller with a 20A BLHeli_S ESC that is specced to handle 2-6s. A board like this will allow you to greatly simplify and lighten builds with less space required and this is exactly what I have done to improve my 3 inch Flex RC komori.

JHEMCU is not a catchy brand name but they did do themselves proud by releasing the first AIO board with 25.5mm mount (whoop boards) that were truly reliable, namely the GHF411AIO and GHF405AIO which were successfully used to power quads up to 5 inch. They've built on this success by making and releasing more products, including the GHF420AIO as I'm reviewing here. 20mm mount boards have had little attention since the rise and rise of the whoop board but they are still highly relevant in 3 and 4 inch quads where it is still the most common mounting pattern. It's not the first time there has been an AIO 20mm board - The original HGLRC Zeus was released 2 years ago but this was plagued with faults, and was expensive meaning even a single burnt ESC (which was common on these) meant you $60 spend was down the drain. Well the good news is with JHEMCU here the cost is down to $35 before discounts applied and quality is well up.

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