Twin-Boom Tail RC Aircraft Design for Enhanced Flight Stability and Control

Abstract

This study explores the aerodynamic and flight-control benefits of employing a twin-boom tail configuration in radio-controlled (RC) aircraft, emphasizing enhancements in flight stability, control effectiveness, and overall handling qualities. A 2018 RC aircraft prototype with a wingspan of 1 meter was developed, featuring dual carbon-fiber booms extending rearward from mid-span to support individual vertical tails linked by a straight horizontal stabilizer. Computational fluid dynamics (CFD), employing Reynolds-Averaged Navier-Stokes (RANS) modelling, was conducted to evaluate aerodynamic performance across critical flight regimes. Comparative analysis with a conventional single-fuselage tail configuration focused on stability derivatives (e.g., Cₙ_β, Cₘ_q), control surface effectiveness, and drag characteristics. Wind-tunnel testing on 1:2 scale models substantiated the simulation data, particularly in capturing yaw and pitch damping improvements. Flight trials conducted in controlled ambient wind conditions assessed dynamic behavior via telemetry-recorded inertial measurements, control inputs, and pilot evaluations. Results indicate notable enhancements in directional stability: the twin-boom layout achieved up to 20% higher yaw damping derivative, about 18% improvement in pitch damping, and a small yet manageable drag increase (~3%). Control effectiveness improved, with rudder authority increased by approximately 15% for equivalent deflections. Pilot feedback praised smoother handling during coordinated turns and improved stall recovery. The study concludes that, as of 2018, twin-boom tail RC aircraft present a viable design alternative that balances improved stability/control with minimal aerodynamic penalties. The findings offer valuable insight for RC trainers, aerial imaging platforms, and advanced hobbyist aerobatic designs.