Abstract: A paddleboard (10) comprising a right board (12) slidingly connected to a left board (14). At least one interlocking sliding element is connected to the right board 12, and at least one interlocking sliding element is connected to the left board 14. Right board (12) and left board (14) are slidable longitudinally with respect to one another only within the plane of paddleboard (10), and parallel to the long axis of paddleboard (10). Utilizing a user's legs and feet to slide right board (12) and left board (14) longitudinally causes a propulsion system to propel paddleboard (10) over the water. A suitable propulsion system comprises pivoting paddles (16) or flaps (40) mounted under right board (12) and under left board (14).

Abstract: A paddleboard (10) comprising a right board (12) slidingly connected to a left board (14). Right board (12) and left board (14) are slidable longitudinally with respect to one another only within the plane of paddleboard (10), and parallel to the long axis of paddleboard (10). Utilizing a rider's legs and feet to slide right board (12) and left board (14) longitudinally causes a propulsion means to propel paddleboard (10) over the water. A suitable propulsion means comprises pivoting paddles (16) or flaps (40) mounted under right board (12) and under left board (14).

Abstract: An arch-shaped mouthpiece for forming custom dental trays intraorally, which is typically comprised of a sheet of low-melting custom tray material containing a filler, preferably air. The mouthpiece may also have a supporting frame comprised of a facial wall connected to a lingual wall, and a handle. The supporting frame may support the tray material and filler for a single arch, or for both arches. The tray material may contain occlusal pressure indicating means, such as small, rupturable capsules. In typical use, the mouthpiece is heated, the teeth forcefully bite into the tray material and contained filler, thereby molding the tray material to the teeth, the tray material is cooled, the mouthpiece is removed from the teeth, and excess tray material is trimmed away to form a tray.

Abstract: Material and methods for constructing custom dental trays quickly and inexpensively, especially dental trays which are useful for the detection, evaluation, and treatment of mandibular parafunction. A manufactured dental tray material includes occlusal pressure indicators, and can include electronics for storing and analyzing occlusal pressures.

Abstract: A vertical takeoff and landing aircraft is disclosed that includes a support structure having a motor mounted vertically thereto, with the motor having a propeller for rotation in a horizontal plane. A power supply for the motor is mounted to the support structure below the motor and electrical coupled thereto. A plurality of fins are attached by their first end to the power and extending radially outward therefrom. Vertical posts have there first ends attached to the second end of the fins and extend upward to the plane of rotation of the propeller. A ring is mounted horizontally to the second ends of the plurality of vertical posts surrounding the propeller. The torque produced by the drag of fins as the aircraft rotates in the opposite direction reacting the torque of the propeller equal to the torque of the propeller necessary to achieve hover. The rotational inertia of aircraft is made equal to the rotational inertia of the propeller.

Abstract: A protective ballute for a payload launched from an airborne platform includes an elongated shroud member, gas delivery apparatus for filling the shroud member with a lighter-than-air gas to inflate the shroud member. A payload as ballast is provided at one end portion of the shroud member for rendering the ballute heavier than air. Flight control and guidance apparatus is carried by said shroud member for determining a flight path and attaining a predetermined target landing site. A mechanism carried by the shroud member releases the payload from the shroud member upon reaching the landing site while maintaining said shroud member in its inflated state. The shroud member then rises or "floats" away from said landing site to another removed location, or if desired will self-destruct.