Reconfigurable systems are meant to provide users with increased flexibility, while enabling reduced manufacturing costs due to the use of shared parts between system variants. This paper aims to present the conceptual design of a family of unmanned aerial vehicles (UAVs), known as ’Switchblade’, developed for wide multi-mission capability. Four UAV variants are designed for distinct flight performance: low-speed high endurance (LSHE), high-speed long range (HSLR), and vertical takeoff and landing (VTOL) enabled variants of each. Module commonality is maximized in order to reduce complexity and development costs. The design approach employs the concept of ’parent-variants,’ which drives design and performance analysis for all variants. This is illustrated in the paper with specific examples of propulsion and longitudinal stability analysis. Preliminary computational fluid dynamics (CFD) simulations of the aerodynamic characteristics of the LSHE and HSLR variants were carried out. The results suggest that the computed lift-to-drag ratios, L/D between the CFD results and the analytical approximations using finite wing theory are in reasonable agreement.