HTS Motors in Aircraft Propulsion: Design Considerations

Current high temperature superconducting (HTS) wires exhibit high current densities enabling their use in electrical rotating machinery. The possibility of designing high power density superconducting motors operating at reasonable temperatures allows for new applications in mobile systems in which size and weight represent key design parameters. Thus, all-electric aircrafts represent a promising application for HTS motors. The design of such a complex system as an aircraft consists of a multi-variable optimization that requires computer models and advanced design procedures. This paper presents a specific sizing model of superconducting propulsion motors to be used in aircraft design. The model also takes into account the cooling system. The requirements for this application are presented in terms of power and dynamics as well as a load profile corresponding to a typical mission. We discuss the design implications of using a superconducting motor on an aircraft as well as the integration of the electrical propulsion in the aircraft, and the scaling laws derived from physics-based modeling of HTS motors.

On Suffering and Sympathy: Jude the Obscure, Evolution and Ethics

This article links Thomas Hardy’s exploration of sympathy in Jude the Obscure to contemporary scientific debates over moral evolution. Tracing the relationship between pessimism, progressivism, and determinism in Hardy’s understanding of sympathy, it also considers Hardy’s conception of the author as enlarger of “social sympathies”--a position, I argue, that was shaped by Leslie Stephen’s advocacy of novel writing as moral art. Considering Hardy’s engagement with writings by Charles Darwin, T. H. Huxley, Herbert Spencer, and others, I explore the novel’s participation in a debate about the evolutionary significance of sympathy and its implications for Hardy’s understanding of moral agency. Hardy, I suggest, offered a stronger defence of morality based on biological determinism than Darwin, but this determinism was linked to an unexpected evolutionary optimism.