This study examines the impact of variable mass on the flight range and endurance of unmanned aerial vehicles (UAVs), focusing on their potential for delivering specialised cargo. Key applications include medical supply transport, agricultural logistics, and humanitarian missions, highlighting the role of UAVs like the Agrobee in overcoming geographical and logistical challenges. By integrating theoretical principles, aerodynamic analysis, and practical design considerations, the paper explores how variable mass dynamics – arising from fuel consumption and mid-flight cargo drops – affect UAV performance. The research provides analytical models and operational insights for optimising UAV efficiency, bridging the gap between theoretical ideals and real-world constraints. Additionally, the study evaluates the practical implications of variable mass on UAV stability, flight endurance, and energy consumption. It examines payload management strategies, and mission planning considerations, essential for ensuring operational safety and efficiency. UAVs’ capability to dynamically adjust their weight mid-flight through controlled cargo drops presents opportunities for enhanced mission flexibility and cost-effective logistics. However, challenges such as aerodynamic stability, cargo release mechanisms, and weather dependencies must be carefully addressed. This research contributes to the development of improved UAV operational frameworks, promoting more sustainable and efficient logistics solutions in various industries.