This is the first successful flight of my "Tiny Liquid" nitrous/kerosene rocket motor. It is a 24mm F28 motor that is built into a 6 grain Cesaroni case. It uses standard "U/C valve" hybrid GSE for filling and launching which simplifies operations. For this flight, I flew it in an existing rocket called "Sign Here Please" ( https://www.thingiverse.com/thing:288... ). It was a little underpowered in a rocket this big (which I knew going in), but was overall a good flight.

Being an F motor with only 40 grams of propellant, I am pretty sure it is the smallest amateur liquid ever to fly.