The overall objective of this project is to develop and improve knowledge on long range, low cost and environnmentally friendly UAV for long flight over the region for measurement campaign, survey application and related activities. The project will design, manufacture and operate a low cost high endurance UAV of a maximum MTOW of 25 kg by taking into account the specific scientific, technical and legal frameworks of the upper Rhine Region. It will be propelled by electric brushless motors combined with fuel cells or by optimized environment-friendly thermal engines. This UAV should be able to carry payload of mass