Abstract: A lift producing multi-rotor apparatus with a single gear, central drive gear unit actuating gear driven rotor-shaft units having pitch-controlled rotor heads where the rotor units are disposed directly opposite from each other, the direction of rotation of opposing rotor units are opposite from each other, and where the rotational-disk defined by each rotor overlaps two adjacent rotational disks.

Abstract: An apparatus comprising a body defining a first vertical axis, two or more frame members each having a longitudinal axis and having an inner-end and an outer-end connected to the body at the inner-end and where a first horizontal geometrical plane is generally coincident with the longitudinal axis of each of the two or more frame members and where the first horizontal geometrical plane is generally orthogonal to the first vertical axis, two or more rotary-wings each comprising one or more blades whose rotation defines a first rotational axis which is configurable to be nearly parallel with the first vertical axis and comprising a second rotational axis which is configurable to be approximately parallel first horizontal geometrical plane where a first of the two or more rotary-wings having a blade-inner-end and a first blade-outer-end rotatably connected by its blade-inner-end to a first transmission is disposed substantially on the outer-end of a first of the two or more frame members, a second of the two or

Abstract: An apparatus can include a piston movably disposed within a pressure vessel and defines a first interior region and a second interior region. The piston has a first position in which the first interior contains a gas having a first pressure and has a volume greater than the second interior region, and a second position in which the second interior region contains a gas having a second pressure and has a volume greater than the first interior region. A seal member is attached to the piston and to the pressure vessel. The seal member has a first configuration in which at least a portion of the seal member is disposed at a first position when the piston is in its first position, and a second configuration in which the portion of the seal member is disposed at a second position when the piston is in its second position.

Abstract: An apparatus can include a piston movably disposed within a pressure vessel and defines a first interior region and a second interior region. The piston has a first position in which the first interior contains a gas having a first pressure and has a volume greater than the second interior region, and a second position in which the second interior region contains a gas having a second pressure and has a volume greater than the first interior region. A seal member is attached to the piston and to the pressure vessel. The seal member has a first configuration in which at least a portion of the seal member is disposed at a first position when the piston is in its first position, and a second configuration in which the portion of the seal member is disposed at a second position when the piston is in its second position.

Abstract: An apparatus can include a piston movably disposed within a pressure vessel and defines a first interior region and a second interior region. The piston has a first position in which the first interior contains a gas having a first pressure and has a volume greater than the second interior region, and a second position in which the second interior region contains a gas having a second pressure and has a volume greater than the first interior region. A seal member is attached to the piston and to the pressure vessel. The seal member has a first configuration in which at least a portion of the seal member is disposed at a first position when the piston is in its first position, and a second configuration in which the portion of the seal member is disposed at a second position when the piston is in its second position.