Analyzing Characteristics of Flow Between Intermeshing Rotors to Aid in Urban Air Mobility Vehicle Design

Urban Air Mobility is an exciting alternative to traditional, ground-based forms of public transportation, promising to reduce carbon emissions, shorten commute times, and lessen ground traffic. Sizing the vehicles proposed to fulfill this concept is important, as minimizing their profile improves accessibility to this mode of travel. One method of accomplishing this is by shifting the rotors closer together, as with NASA’s Reference Model 2. However, when the rotors are moved close enough to overlap during flight, the flow in this intermeshing region becomes highly unsteady and complex. This investigation seeks to understand and visualize flow under these conditions, and apply this data to optimizing efficiency. Data will be gathered by placing a simplified rotorcraft model into a wind tunnel. The results will also be compared to CFD simulations conducted by NASA

AIAA Design, Build, Fly Team - MULLET Competition Aircraft 2021-2022

MULLET, the Medical Unmanned Low-Level Electric Transport, is Embry-Riddle Aeronautical University Daytona Beach’s aircraft for the 2021–2022 AIAA Design, Build, Fly competition. This UAV was designed to perform four missions, including a ground mission and three flight missions. Mission 1 is a deployment flight that demonstrates the aircraft’s flight capability; Mission 2 is a staging flight for the transportation of vaccine syringes; Mission 3 is a delivery flight for the transportation and deployment of vaccine vial packages; and the Ground Mission is a demonstration of the ability to rapidly prepare the aircraft for flight. The aircraft was designed, manufactured, and flown by a team of 40 undergraduate aerospace engineering students. The design process comprised three phases: conceptual, preliminary, and detail design. Initially, the conceptual design focused on analyzing the requirements with a scoring analysis to select the optimal payload that maximized the mission scores. After the aircraft and subsystem configurations were selected, the weight, wing, tail, and propulsion system were sized during the preliminary design. A detail design then focused on the aircraft’s structural characteristics and systems integration. The manufacturing process followed with the goal of fabricating the aircraft to the designed specifications and weight. A detailed schedule was developed and was continuously refined to manufacture each aircraft iteration in a timely manner, enabling rapid prototyping throughout the design, build, and fly process. Finally, a testing plan was established to evaluate a series of test objectives essential to the aircraft’s mission performance

Editorial: The end of ‘the West’ and the future of global constitutionalism

Dieser Beitrag ist mit Zustimmung des Rechteinhabers aufgrund einer (DFG-geförderten) Allianz- bzw. Nationallizenz frei zugänglich / This publication is with permission of the rights owner freely accessible due to an Alliance licence and a national licence (funded by the DFG, German Research Foundation) respectively

Global constitutionalism as Agora: interdisciplinary encounters, cultural recognition and global diversity

An error was made in the editorial for the previous issue of this journal, Global Constitutionalism 8(1). In the editorial, mistaken reference was made to Aoife and O'Donoghue as the authors of 'Can Global Constitutionalism Be Feminist?' in S Harris Rimmer and K Ogg (eds), Research Handbook on Feminist Engagement with International Law (Edward Elgar 2019). This of course should have referred to Aoife O'Donoghue and Ruth Houghton.</p

Should Radiology Delay the Start of Fellowships? A Survey of the APDR

RATIONALE AND OBJECTIVES: Several major medical specialties have recently considered delaying the start date of their fellowship training programs to allow for completion of their trainees\u27 residency obligations. Radiology program directors (PDs) have voiced the need for a similar solution, as fellowship start dates at some institutions now occur well before the end of residency training. The objectives of this study are to assess the current state of the radiology fellowship transition and understand its impact on residency programs and clinical services. MATERIALS AND METHODS: Survey Monkey (Palo Alto, CA) was used to create a survey consisting of 9 multiple choice and 2 free text questions. The survey was approved by the survey committee of the Association of Program Directors in Radiology (APDR) and distributed via email to all 240 APDR members in November 2018. The survey was closed after 30 days. RESULTS: The response rate was 67% (160/240). Fifty-nine percent of respondents indicated some of their residents are asked to arrive at fellowships before July 1, often several days early for orientation and picture archiving and communication system (PACS) training. Sixteen percent of respondents said their own institutions ask incoming fellows to arrive early. Sixty-four percent of respondents indicated that this causes staffing problems. Seventy-eight percent of respondents supported considering a delay to the start of radiology fellowships. CONCLUSION: Most APDR members claim that residents are asked to arrive at fellowships early to complete orientation and training before July 1, and most say that this produces staffing problems on services. A significant majority of respondents support a discussion regarding delaying fellowship start dates