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Aircraft technology demonstrator is an aircraft which is used for experimental and demonstration purpose. This type of aircraft has a unique capability, i.e. demonstrating the experimental or newly developed system. The consequence is the aircraft not only has to be able to ensure its own safety like a normal aircraft, but also needs to be capable to return the aircraft to safety in case of the experimental system. This article presents a design for Electronic Flight Control System to safely execute experimental Flight Control Laws in flight test. The purpose of this research is to provide a relatively safe way to test newly developed Flight Control Laws in experimental flight. This research uses linear models of the Light Surveillance Aircraft, which have been developed in LAPAN Indonesia since 2014. The simulations that have been done indicate that the Experimental System is able to execute the experimental commands and reduce accidental risk by giving a relatively safer signal whenever the aircraft is going into potentially dangerous maneuver. [ABSTRACT FROM AUTHOR]

Nowadays Unmanned Aircraft Vehicle (UAV) technology has been developed rapidly, including in Indonesia. LAPAN Surveillance UAV (LSU)-02 is one of the fixed-wing UAVs in Indonesia. It has been developed by LAPAN, the national aerospace research agency of Indonesia, for mapping and surveillance. The UAV has been equipped with automatic flight control system. However, the automatic system was not made based on the flight dynamic characteristic of the UAV. Therefore, optimization in certain flight condition becomes difficult. Hence, the aim of this research is to develop a mathematical model of LSU-02 for automatic control and guidance system design. A 6-DOF (degree of freedom) non-linear mathematical model was build based on aerodynamics, weight and balance, and propulsion of the UAV. The model is then evaluated by performing numerical simulation on the designed cruise condition. The simulation results show a dynamically stable characteristics for longitudinal motion and an unstable characteristic for lateral directional motion. [ABSTRACT FROM AUTHOR]