An acoustic projector which includes an outer shell formed of a reinforced epoxy resin having a longitudinal slot has an inner reinforcing liner formed of metal to reduce mechanical stress. The method further includes obtaining a measurement relating to property of interest of the core using at least one sensor; and estimating the property of interest of the core using the obtained measurement. A second method employs network delay measurements from geographically distributed locations to triangulate the coordinates of the host. The parallel portion is configured to electrically isolate the conductor set. At least the radial shaft bearing is seated in a bearing sleeve that is connected to the compressor housing and projects into an interior space of the housing.