Abstract: A jig for constructing a mainframe of an airship structure, including multiple tracks configured in a radial pattern, each track including rails that are configured to be parallel to each other, multiple front carts for securing inner portions of the mainframe corresponding to an inner circumference of the mainframe, each front cart configured to be positionally adjustable along one of the tracks, and multiple back carts for securing outer portions of the mainframe corresponding to an outer circumference of the mainframe, each back cart configured to be positionally adjustable along one of the tracks.

Abstract: A jig for constructing a mainframe of an airship structure, including multiple tracks configured in a radial pattern, each track including rails that are configured to be parallel to each other, multiple front carts for securing inner portions of the mainframe corresponding to an inner circumference of the mainframe, each front cart configured to be positionally adjustable along one of the tracks, and multiple back carts for securing outer portions of the mainframe corresponding to an outer circumference of the mainframe, each back cart configured to be positionally adjustable along one of the tracks.

Abstract: A smart phone used by an end user includes a positioning circuit; a computer readable memory; and an app resident on the computer readable memory. The app is configured to cause the positioning circuit periodically to determine a preferred location of the smart phone and transmit the preferred location to a remote server via a network. The app executes a plurality of local rules based on the preferred location and receives location-specific content that is selected based on the preferred location from the server via the network. The location-specific content is presented to the end user. A software development kit for generating a smart phone app facilitates quick app generation.