Readytosky Mark4 7" is an affordable frame for building a long-range drone. As the name suggests, the frame can hold 7" propellers. The center section can accommodate a stack with both 30.5x30.5mm and 20x20mm hole spacing. There is space for a video transmitter in the rear of the frame. The arms are cut from 5mm thick carbon. The camera is mounted in carbon sidewalls that also protect it. The frame weighs 121grams, which is very good for a 7" drone. The frame is especially suitable for building an analog drone.