Abstract: An aircraft can include a stacked propeller to generate lift during assent and descent. The stacked propeller includes a first propeller and a second propeller that co-rotate about an axis of rotation. In one embodiment, the blades are coupled to a rotor mast that contains an internal cavity. In one mode of operation, the first propeller and/or the second propeller can be stored in the internal cavity in order to reduce drag during flight. The aircraft can include one or more stacked propellers, such as a port propeller and a starboard propeller, which rotate in opposite directions during one or more modes of flight.

Abstract: A spring loaded spacer for fastening components and control units together with touch control face plates or panels wherein the spacer has a shank portion nested in a barrel portion, one end of the barrel portion being connected to a chassis or the like and its shank portion being connected to one or more printed circuit boards and/or components, and wherein the shank portion is spring loaded within the barrel portion and is adapted to receive one or more printed circuit boards and/or components under tensioned engagement.

Abstract: A spring loaded spacer for fastening components and control units with touch control face plates or panels wherein the spacer has a barrel portion having at one end means for connecting the spacer to a chassis or the like and at its other end a shank for connecting it to one or more printed circuit boards and/or components or the like, wherein a spring loaded shank is seated within the barrel and is adapted to receive one or more printed circuit boards under tensioned engagement.