Abstract: A wake reflector system attached to the hull of a surface or subsurface vessel attenuates the visible surface elements of a vessel's displacement wake, making the vessel less likely to be detected by passive observation means from above. The system consists of plates firmly mounted parallel to the longitudinal axis of the hull over a sufficient length and at a sufficient distance outboard from the hull to contain and affect at least the bow component of the displacement wake. The system may incorporate non-reflective means to leak or pass a calibrated portion of the wake energy through the reflector system along its length. When the vessel moves forward, the displacement wake travels to the plate system and is contained and reflected back and forth between the plate system and the hull over the length of the system, substantially attenuating the peak amplitude, integrity and outward momentum of the remaining wake. The system is applicable to both surface vessels and submarines.

Abstract: An improvement to a rotary floor edger/sander machine for eliminating the tracks caused by the castors on the back edge of the edger when working on softer floors. Castors are replaced or supplemented with a float member assembly that provides a relatively larger area of smooth surface support. The rotating disc reduces friction between the float member and the floor, facilitating the manual guidance of the machine over the floor. The float member assembly can also be configured so as to reduce the overall opening between the machine's bellhousing and the floor, increasing the effectiveness of the machine's vacuum action for picking up loosened particles of floor material.