Next generation civil tilt-rotor technology demonstrator (NGCTR-TD) tail design

Abstract

Within the Clean Sky 2 Fast Rotorcraft platform, a Next Generation Civil Tilt-Rotor technology demonstrator (NGCTR-TD) is under development (Ref. [1]) within Leonardo Helicopters. Such platform allows to deep investigate the key technologies in development of a future European civil tilt-rotorcraft, starting from the experience of in-flight aircraft, and concept ERICA studies. One of the key technologies analyzed is the empennage solution, as per preliminary phase of a new aircraft configuration: the proper sizing and design of the tail is essential for ensuring performance and handling qualities. In order to perform this activity, an appropriate aerodynamic toolchain process is adopted for supporting the tail design; further, requirements are appropriately set and tilt-rotor peculiarities addressed. Aerodynamics analysis on tiltrotor empennage have been deeply validated through computational and experimental activities within Leonardo Helicopter Division programs. Based on validated aerodynamic tools, Vee-tail configuration is properly designed and verified to improve tilt-rotor performances. Additionally, aerodynamic devices are analyzed for Vee-tail configuration, to possibly improve or modify handling qualities during the advanced development phase: such devices, so called “finlet”, are considered to be a winning factor for the benefit introduced with limited impact on tail design, specifically for Vee-tail configuration.