3D model of the AT freight aircraft. As the name implies, the aircraft is intented for delivery of freight, and can be made manned or unmanned. The model presented shows only the manned version, the unmanned version would have the control stand outside of the aircraft rather than in the tail, and the ailerons, flaps, elevators, rudder are then controlled wirelessly (by means of an antenna). Radio repeaters could be placed along the path of the regular flight route, hence allowing radio control over (any) distance. The wing profile used is the Clark YH. The ailerons and flaps are controlled in both aircraft versions by means of a electric motor. The rudder and elevators are controlled manually using a wire in the manned version, in the unmanned version, they can be controlled by solenoids controlling the wires. The aircraft has 3 propellers, two of which (in the wing) are powered by a quasiturbine. The front propeller (on the fuselage) is powered by a (Beta-type) Stirling motor. The yellow round box in the model is an oil reservoir and transfers the oil (heated by the quasiturbine) to the hot side of the Stirling engine, hence increasing the energy efficiency (the entire assembly is 70% efficient). 2 fuel tanks are present, one on the top wing, the other on the bottom wing. The fuel is only drained from the top tank. However, when the fuel level drops to below a certain point, it is refilled using fuel from the bottom tank (this is done automatically, using a fuel pump). A special turbocompressor is also present, it is cooled using only oil, the heated oil is also used by the Stirling motor. The loading of the cargo is done via the nose. The nose (together with the front propeller) is removable. The pilot (with the manned version) has a seperate hatch to enter and leave the aircraft (ie in the event of an emergency). The landing gear can be lowered/heightened by means of a solenoid system. See the "Purchasing_the_models" link at appropedia's AT_CAD_Team for additional information on the model