## 4 Discussion  
The scope of this work was the demonstration of possible applications of a Smart Capsule equipped with AI for the delivery of medical materials using drones to overcome current limitations in the regulatory framework and make autonomous delivery possible. Eighty-one missions were carried out for a total of 364 min of flight. The following types of missions were conducted:  
Flights without Smart Capsule: 9--total flight time: 59 min  
Figure 4: Vibration trends with the Smart Capsule mounted (note: comma is by used in this figure instead of dot for decimal separation). Figure 5: Drone data after a landing managed by Smart Capsule AI (note: comma is by used in this figure instead of dot for decimal separation). Flights with Smart Capsule: 18--total flight time: 62  
Flights with Smart Capsule at maximum weight of 6 kg: 48--total flight time: 243 min  
Flight planned using Spoke app and software: 37--total flight time: 149 min  
The missions were carried out following an incremental process to verify the integration of the two subsystems, the drone plus the Smart Capsule. The first observation concerns the fact that no anomalies were found regarding the dynamics of the flight with the capsule mounted on board. The integrated system, therefore, maintained the safety levels required for this type of mission, even with the capsule loaded with a stable payload inside. The vibrations recorded along the X, Y, and Z axes, without a capsule, had comparable values in terms of peaks with those with the capsule mounted (without and with a load of 2 to 6 kg). Additionally, with regard to the response to the commands, the same trends occurred, so it is believed that the installation of the capsule does not cause anomalies in terms of the flight dynamics. From the point of view of the behavior of the electronic system, no anomalies were found when the capsule was switched on. It is therefore believed that the integrated system maintained the safety levels required for this type of mission. The missions loaded with the Spoke application, developed by ABzero, were all successful; consequently, it is also believed in this case that the integrated system maintained the security levels required for this type of mission. The failsafe procedures, both in the case of RC loss or a low battery were always initialized at the right time, thus guaranteeing compatibility of the system with the assigned safety levels. The limits of flight geography were never exceeded. From a system performance viewpoint, the following considerations must be made, which determine choices for the subsequent phases. The speed of the missions cannot be set to 5 m/s as this increases the consumption of the batteries, even if there is a reduction in the accuracy of reaching waypoints; the presence of the Smart Capsule does not affect the overall system characteristics in terms of vibrations along the axes. In comparison with other delivery systems based on drones [20,21], it is worth noting that the Smart Capsule represents an innovation since it introduces an additional intelligence level that can improve the overall safety of a system operating in an urban scenario. The Smart Capsule is, in fact, able to autonomously change a few parameters of a flight if negative events occur in order to guarantee the success of the mission, which can also continue using traditional delivery means after an emergency drone landing. Moreover, thanks to the integration of the already-certified containers inside the Smart Capsule, GDP were already met by the Smart Capsule, even in the experimental phase, which helps to reduce the time to market of the proposed solution. The Smart Capsule implements a \"total machine\" concept, whereby a full active control on the drone it is coupled with the payload (goods transported) and the scope of the delivery mission is performed in a fully autonomous mode--that is, with no need for human operators nor pilots with a drone flight license--all while ensuring full compliance with applicable flying and medical regulations.