Abstract
<jats:p>This paper presents the aeromechanical modelling, first-principles mathematical derivations, and engineering applications of the Mahogany Aerodynamic High-Altitude Stabilizer (MAHAS), a novel bio-inspired passive descent modulator. Designed as an engine-less stabilization mechanism for payload drops and ejecting capsules, MAHAS mimics the highly optimized passive autorotation of Swietenia (mahogany) seeds. Traditional deceleration systems, such as parachutes, frequently suffer from structural collapse, chaotic tumbling, or deployment failure in thin, low-density high-altitude environments. MAHAS overcomes these challenges by exploiting an asymmetric mass offset and twisted airfoil morphology to convert gravitational potential energy into rotational kinetic energy, establishing a stable vertical descent trajectory without active propulsion. This investigation details the mathematical formulation of the center-of-mass offset using a Dual-Mass Point (DMP) representation, the integration of aerodynamic torque through Blade Element Momentum Theory (BEMT), and the vertical force balance under the Yasuda–Azuma multi-axis equilibrium. Additionally, stereoscopic Digital Particle Image Velocimetry (DPIV) and Direct Numerical Simulation (DNS) are used to investigate the attachment of a leading-edge vortex (LEV), stabilized by centripetal and Coriolis accelerations. Aeromechanical scaling limits are analysed, identifying a critical performance boundary at an 8:1 scale ratio where high-Reynolds-number turbulent transitions necessitate strict wing-loading and spin-rate constraints. Finally, the paper discusses the potential integration of the MAHAS architecture into high-altitude environmental sensor drops, fighter jet emergency ejection seats, planetary re-entry capsules, and urban high-rise rescue pods.</jats:p>