tested up to 100 metres and that went well. So the drone pilot did not have to stand in the same space as the drone, using this method". PRESSURE ON THE WALL Terra Inspectioneering, specialised in drones and robotics in confined spaces, focused on wall thickness measurements in addition to positioning. Managing director Steven Verver: "For a wall thickness measurement, the drone has to 'hang' at exactly the right distance along the wall. Sensors that measure the distance and thus control the drone itself proved to be unreliable. The skills of the drone pilot are therefore essential. This quickly brought us to the question: what should a drone pilot be able to do? Because that is also part of the innovation". "The probes were another technical challenge" continues Steven. "They have to apply sufficient, even pressure to the wall and pry a little for a correct measurement result. 12 One also has to take into account that a flying drone always moves, but we were able to solve that too. The gel needed for ultrasonic measurement was another issue. For this we found the solution in a gel pump, which is positioned on top of the drone". LATER AMENDMENTS In this way, great strides have been made towards the final goal. In the end, the reel system was not yet ready to be integrated into the working model, but it was ready for other applications of Del Dynamics. Meanwhile, Terra Inspectioneering developed a wireless method to fly in with the drone. This meant that the drone pilot and the inspector can stand outside the confined space as desired. The drone model was also later adapted to a robust square type. Terra Inspectioneering additionally developed special arms that can be used for e.g. roof and rafter measurements.

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