Aerospace, Vol. 11, Pages 324: Agile Stage-Gate Approach for Design, Integration, and Testing of a 1U CubeSat Aerospace doi: 10.3390/aerospace11040324 Authors: Enrique Rafael García-Sánchez Héctor Simón Vargas-Martínez Filiberto Candia-García Joel Contreras-Lima Life cycle stages are very important for the aerospace industry. Many models have emerged for handling the processes within and across the development of new products. Developing CubeSat-based missions has shortened the required time and has reduced expenses. However, the lack of strategic planning in the design, integration, and testi ..read more

Aerospace, Vol. 11, Pages 325: Analysis and Design of Bat-Like Flapping-Wing Aircraft Aerospace doi: 10.3390/aerospace11040325 Authors: Fan Wang Xinbiao Pei Guangxin Wu Yue Bai As the only flying mammal in nature, bats have superb flight skills and aerodynamic characteristics that have been the subject of research by scholars from all over the world. In recent years, the research on bionic flapping-wing aircraft has made good progress. However, such research mostly uses birds or insects as the research objects, and there are few studies on bat-imitating flapping-wing aircraft. This paper combi ..read more

Aerospace, Vol. 11, Pages 326: Research on Solving the Structural Instability of Composite Propellants by Using Non-Ablative Cladding Layers Aerospace doi: 10.3390/aerospace11040326 Authors: Gang Zhang Mingming Zhan Wen Feng Youwen Tan Yang Liu Weihua Hui In a high-temperature test of the gas generator with a free-loading composite propellant, an abnormal jitter appeared in the latter part of the internal ballistic curve, whereas no such abnormality was observed in the low-temperature and normal-temperature tests. To investigate the cause, quasi-steady-state simulations of the internal flow fi ..read more

Aerospace, Vol. 11, Pages 323: A Resilient Approach to a Test Rig Setup in the Qualification of a Tilt Rotor Carbon Fiber-Reinforced Polymer (CFRP) Wing Aerospace doi: 10.3390/aerospace11040323 Authors: Pasquale Vitale Gianluca Diodati Salvatore Orlando Francesco Timbrato Mario Miano Antonio Chiariello Marika Belardo The evolution of aircraft wing development has seen significant progress since the early days of aviation, with static testing emerging as a crucial aspect for ensuring safety and reliability. This study focused specifically on the engineering phase of static testing for the Clean ..read more

Aerospace, Vol. 11, Pages 322: Sensitivity Analysis for Design Parameters of Electric Tilt-Rotor Aircraft Aerospace doi: 10.3390/aerospace11040322 Authors: Yu Wang Wenyuan Ma Zhaolin Chen In recent years, there has been rapid development in electric aircraft, particularly electric vertical takeoff and landing (eVTOL) aircraft, as part of efforts to promote green aviation. During the conceptual design stage, it is crucial to select appropriate values for key parameters and conduct sensitivity analysis on these parameters. This study focuses on an electric tilt-rotor aircraft and proposes a perf ..read more

Aerospace, Vol. 11, Pages 321: Seasonal Variations in Lunar-Assisted GEO Transfer Capability for Southward Launch Aerospace doi: 10.3390/aerospace11040321 Authors: Su-Jin Choi Hoonhee Lee The launch azimuth of the Naro Space Center is limited toward the south of the Korean peninsula, at 170 ± 10 degrees, suitable for the polar orbit, sun-synchronous orbit, and safety range issues. In this circumstance, one option to send a satellite into GEO is to perform a dog-leg maneuver during ascent, thus forming a medium-inclination orbit under such a restrictive condition. However, this o ..read more

Aerospace, Vol. 11, Pages 319: Dynamic Analysis of Three-Rotor System with Hollow Shaft under Clutch Misalignment Aerospace doi: 10.3390/aerospace11040319 Authors: Guofang Nan Haoyu Wang Dengliang Yu Rotor system of aviation engines is often made of multiple rotors connected by the clutch. Due to manufacturing and assembly errors, there is a clutch misalignment, including the parallel misalignment and the angle misalignment. This misalignment produces additional torque in the operation of the system, leading to an abnormal increase in its oscillation, which causes the rubbing between the stato ..read more

Aerospace, Vol. 11, Pages 320: Wing Efficiency Enhancement at Low Reynolds Number Aerospace doi: 10.3390/aerospace11040320 Authors: Lance W. Traub The aerodynamic performance of wings degrades severely at low Reynolds number; lift often becomes non-linear, while drag increases significantly, caused by large extents of separation. Consequently, a non-conventional wing design approach is implemented to assess its ability to enhance performance. The design methodology is that of wing segmentation, where the wing is divided into spanwise panels that can be separated, thereby yielding small gaps be ..read more

Aerospace, Vol. 11, Pages 315: Aerodynamic Analysis of Deorbit Drag Sail for CubeSat Using DSMC Method Aerospace doi: 10.3390/aerospace11040315 Authors: Jiaheng Chen Song Chen Yuhang Qin Zeyu Zhu Jun Zhang Reducing space debris is a critical challenge in current space exploration. This study focuses on designing a drag sail for CubeSat models and examining their aerodynamic properties using the direct simulation Monte Carlo (DSMC) method. The analysis encompasses the aerodynamic performance of intricate three-dimensional shapes with varying sail dimensions at orbital altitudes of 125 km, 185 k ..read more

Aerospace, Vol. 11, Pages 317: Cooling of Superconducting Motors on Aircraft Aerospace doi: 10.3390/aerospace11040317 Authors: Alan Caughley Grant Lumsden Hubertus Weijers Sangkwon Jeong Rodney A. Badcock Superconducting electric motors are required in order to deliver lower-carbon aviation. Critical to the success and viability of operating superconducting electric motors in aviation is keeping the superconducting coils at their operating temperature. This paper examines the challenges of keeping a superconducting motor cold if it were used on a single aisle passenger aircraft such as an Airb ..read more