Abstract: A sealing device for a modulating valve of the type having a valve body defining a flow passage, an inlet and outlets, a valve displaceable in the flow passage to control an opening of the flow passage, and an actuator having an actuator rod rotatably coupled to the valve for displacing the valve in the flow passage. The sealing device comprises a body surrounding the actuator rod of the modulating valve. Connection means are adapted to secure the body of the sealing device to the valve body. Sealing means are provided between the body of the sealing device and the actuator rod and between the body of the sealing device and the valve body, to prevent fluid flow therebetween. The body of the sealing device and the sealing means are adapted to conceal and contain fluid leaks between one of the valve and the actuator rod, and the valve body, whereby no fluid is lost due to a leaking modulating valve.

Abstract: An ornithopter has the capability of slow speed flight as a result of vertical movement of its wings. Two sets of wings are provided with vertical movement of each set of wings 180 degrees out of phase for counterbalancing vertical forces on the fuselage. The direction of the flight path is changed by deflecting the fuselage.

Abstract: An ornithopter with two set of opposed wings maintains powered flight by flapping each set of wings. To dampen vibration, each set of wings move 180 degrees out of phase. To further dampen vibration, the empennage and cockpit are articulated to move vertically in response to the movement of the wings. Changes of flight direction result from wing warping and changing the center of gravity of the ornithopter.