AlfaRC Cub is a small frame for 2" propellers. The bottom plate is made of 2.5 mm thick carbon and the whole frame weighs only 14 grams. This frame is suitable for building a copter especially for flying in the gym or garden. The frame can be fitted as an AIO board for whoopy, as well as a 20x20 or 16x16 stack, the height of the post is 18mm.