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Espruino is a JavaScript interpreter for low-power Microcontrollers. This site is both a support community for Espruino and a place to share what you are working on.
@IanWatkins
Above it only needs to be twice the prop diameter.
Below is needs to the best part of 15 times that as the craft produces 7kg of thrust at full power.
While the craft is climbing, the sensors on the mast are in clean air.