{"content":[{"text":"Improving the Performance of a \n Quadcopter Drone with OMNISTM \n Drones have proven to be an efficient solution for a large range of applications within the \n military, industrial, and private consumer domains. In the last decade, their use has been soaring. \n It is estimated that 274 600 drone units were sold in 2018 while the market is anticipated to \n rapidly develop at an annual growth rate exceeding 50% [1].","bbox":{"left":0.117647,"top":0.091971,"width":0.7598039999999999,"height":0.16319999999999998}},{"text":"There are two main categories of aerial drones, namely rotorcraft capable of vertical take-off and \n landing (VTOL) and fixed-wing vehicles. Multirotor or multicopter rotorcraft drones are \n employed in a wide range of applications. They offer numerous advantages over the fixed-wing \n systems such as the ability to hover (maintain a constant altitude), take-off, and land vertically as \n well as ease of control and operation in general. Such capabilities allow for unique applications \n such as, for instance, indoors operations or wind turbine and construction site inspection where \n fixed-wing vehicles could not be efficiently used.","bbox":{"left":0.117647,"top":0.271044,"width":0.7607680000000001,"height":0.13700599999999996}},{"text":"Examples of modern commercial drone configurations [2]","bbox":{"left":0.271863,"top":0.769983,"width":0.45633300000000004,"height":0.01677899999999999}},{"text":"On the other hand, multicopters have several inherent shortcomings such as flight time and \n range. The principal rotorcraft phenomena such as vortex interaction and vortex ring state remain \n applicable as well.","bbox":{"left":0.117647,"top":0.802635,"width":0.763333,"height":0.05685499999999999}}],"images_bbox":[{"left":0.199755,"top":0.410757,"width":0.600716,"height":0.356124}],"images_bbox_not_text_overlap":[{"left":0.199755,"top":0.410757,"width":0.600716,"height":0.356124}]}