The efficiency of electric motors and generators operating with high rotor surface speeds is reduced due to viscous shear and aerodynamic effects. These losses are generally referred to as "windage loss." In some specific, high speed machines of particular interest to the aircraft community, it… More

Micro gas turbine engines with state-of-the-art ultra-compact recuperators could be a real game-changer for small unmanned air vehicles and portable power generation. A key enabling technology for these engines is a low-cost, high speed bearing system that has long life, while operating without… More

Designers of modern, high speed electrical power generation machinery have had great success in increasing the overall system efficiency of these machines over the past few decades. These increases in efficiency are extremely important for applications in modern tactical aircraft, where any losses… More

Seawater lubricated propulsor (i.e., stern tube) bearings are one of the most important bearings aboard a ship. The performance and life of these bearings directly affects the vessel's operational capabilities, life cycle costs, and overall availability. In a single shaft vessel such as an Ohio… More