Abstract: A plurality of plates are rigidly affixed normal to forward and rearward surfaces along a major axis of a maximal diameter of an asymmetrical rotating antenna. In the presence of a wind, any aerodynamic forces tending to produce aerodynamic rotational moments on the antenna are reduced by the interaction between the wind, which produces a boundary layer on the antenna, and the plates, which affect the boundary layer.The net effects of the plates are to reduce the aerodynamic pressure difference between the forward and rearward surfaces of the antenna and to move the center of aerodynamic pressure closer to the center of rotation of the antenna. Due to these effects, the overall aerodynamic rotational movement on the antenna is reduced.

Abstract: A converging/diverging venturi assembly positioned in a subsonic fluid flow stream for producing a supersonic flow velocity in the downstream diverging section with a pressure pickoff system that is located adjacent a minimum static pressure location just prior to a point where shock waves begin to form. The low pressure in the supersonic region in front of the shock wave may be utilized for reducing the boiling temperature of a fluid in a boiler by porting a tube from the low pressure venturi to the boiler, thus improving the heat transfer characteristics of the boiler where the boiler is used for a heat sink for heat sources in a mobile vehicle.