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UAS Airframe Design
Published in R. Kurt Barnhart, Douglas M. Marshall, Eric J. Shappee, Introduction to Unmanned Aircraft Systems, 2021
Michael T. Most, Michael Stroup
A second example of a novel UAS rotary-wing design is that of the single-rotor, ducted-fan Honeywell RQ-16 Tarantula Hawk (T-Hawk) powered by a four HP boxer twin (Figure 10.9). The ducted fan is extremely efficient (negligible induced drag) allowing for a rotor many times smaller than would otherwise be required. The T-Hawk overcomes torque effect by deflecting the thrust of the fan with fixed turning vanes and maneuvers by using louvers to vector thrust (direct or deflect fan discharge) in the desired direction of travel.
UAS Airframe and Powerplant Design
Published in Douglas M. Marshall, R. Kurt Barnhart, Eric Shappee, Michael Most, Introduction to Unmanned Aircraft Systems, 2016
A second example of a novel UAS rotary-wing design is that of the single rotor, ducted-fan Honeywell RQ-16 Tarantula Hawk (T-Hawk) powered by a four HP boxer twin (Figure 10.8). The ducted fan is extremely efficient (negligible induced drag) allowing for a rotor many times smaller than would otherwise be required. The T-Hawk overcomes torque effect by deflecting the thrust of the fan with fixed turning vanes and maneuvers by using louvers to vector thrust (direct or deflect fan discharge) in the direction opposite the desired direction of travel.
Aerodynamic analysis on unsteady characteristics of a ducted fan hovering in ceiling effect
Published in Engineering Applications of Computational Fluid Mechanics, 2023
Yiwei Luo, Tianfu Ai, Yuhang He, Zhiran Zhao, Bin Xu, Yuping Qian, Jie Peng, Yangjun Zhang
Due to high maneuverability and strong adaptability, unmanned aerial vehicles (UAV) with vertical take-off and landing functions have been extensively used for civil and military applications (Ai et al., 2020; Bingöl & Güzey, 2022; Wei et al., 2022). Ducted fans as potential thrustors of UAVs have received widespread attention (Aboelezz et al., 2022; Hu et al., 2022; Luo et al., 2021). Compared with propeller propulsion, ducted fans can generate additional thrust while reducing runtime noise with the help of the duct. Above characteristics ensure that the ducted fan propulsion system has larger thrust at the same size or a more compact structure at the same thrust, which is suitable for the UAV application scenarios, especially narrow terrain operations. When the ducted-fan drones carry out emergency tasks in narrow zones, such as the Search and Rescue in the event of a disaster (Husain et al., 2022), the complex and changeable environment will cause aerodynamic interference to the ducted fan. In case that the disturbance is strong enough and develops over time, the stability of the ducted fan decreases sharply, and thrust fluctuation or even loss of control may occur. Therefore, it is of great significance to investigate the aerodynamic performance of ducted fan in restricted environment to improve its stability and broaden the application scenarios of ducted-fan UAVs.