Abstract: Disclosed herein is a rotary internal combustion engine comprising a housing including walls defining a rotor cavity having axially spaced sides, a rotor shaft rotatably supported by the housing, extending through the rotor cavity, and including an eccentric, a rotor rotatably supported on the eccentric and within the rotor cavity, which rotor includes equi-angularly spaced apexes which, together with the rotor cavity, define working chambers rotatable within the rotor cavity, which rotor also includes side seals engaging the rotor cavity sides to restrain leakage of pressure from the working chambers, meshed gears on the rotor and on the housing for causing rotation of the rotor on the eccentric and rotation of the rotor shaft relative to the housing, and a gas recirculation system extending, at least in part, in the housing and including means defining a closed gas recirculation path including a first path portion in the rotor, a second path portion in the rotor shaft, a third path portion located to receiv

Abstract: Disclosed herein is a boat including a hull comprising a bottom surface including a panel having leading and trailing edges, together with forward and rearward bottom surface portions adjacent to the leading and trailing edges of the panel. Also included in the boat hull is structure pivotally mounting the panel to the boat hull forwardly of the stern of the boat hull for movement about a transverse axis between a first position wherein the leading and trailing edges of the panel merge with the forward and rearward portions of the bottom surface and a second position wherein the panel leading edge merges with the forward portion of the bottom surface and the panel trailing edge is spaced below the rearward portion of the bottom surface, together with means for pivotally displacing the panel between the positions.