The part that has made a sudden turn in our F1A model construction. The main idea was that all machinery can be separated from the fuselage to allow easy adjustment, repair and even replacement. W Hobby Cartridge contains: 3 Function Timer with one adjustable arm, towhook and wingwiggler with extremely strong pressure on the wing and very light load on timer, completely adjustable. To make your own fuselage you have to build a wooden or plastic shell around the Multifunctional Cartridge, which is made from steel and can accept all the load on itself. This part is highly standardized and every Multifunctional Cartridge can be replaced with identical one in case of malfunction. The bottom part of Multifunctional Cartridge is molded from glass, carbon and steel. Contains a space for ballast and forms the bottom of your fuselage. Multifunctional Cartridge can be mounted on 2-3 bolts, the minimal space required is 16mm. The bottom part of Multifunctional Cartridge is molded from glass, carbon and aluminum. Instructions and drawings are included.