FIIshTank (Hoverbot Ultralight Prototype)
https://rotorbuilds.com/build/8061
First indoor flight on 2S w/ 50% throttle curve.
I've gotten a pretty complex model setup on OpenTX to let me use one switch for 2S full throttle for outdoors, 2S 50% throttle for indoors, and 1S, with proper voltage alarms.
See https://imgur.com/gallery/Ves00 for OpenTX setup.