Abstract: An aircraft landing gear bay door 140 including an attachment mechanism suitable for pivotally mounting the door to an aircraft, a first side 141 arranged to face inwardly in relation to the aircraft landing gear bay when the door is closed and face towards one side of a main leg of the landing gear when the door is open and the landing gear is deployed, and a second opposite side 142. The shape formed from the first and second sides provides an aerofoil profile of the door. The invention also provides an aircraft landing gear arrangement 100, an aircraft 1000, methods of operating an aircraft and a method of reducing noise.

Abstract: A system stores information of various electrical components and includes a computing resource. The resource receives design requirements indicative of a desired power supply design (e.g., an input voltage, an output voltage, an output current, and a value indicative of maximum output voltage ripple). The resource determines electrical components that comply with the input voltage, output voltage, and output current and then generate power supply designs that satisfy the input voltage, output voltage, and output current. For each power supply design, the resource calculates an output capacitor and an inductor. The capacitor is selected by adjusting the capacitor's ESR. A post ripple filter circuit may be added. Inductor ripple may be reduced by sizing the inductor for a target ripple. The provides the power supply designs in a ranked order.