# O’Neill Cylinders visualized

The video below provides an excellent view of what a O’Neill Cylinder would look like.

# O’Neill cylinders

Below a cross-sectional diagram of an O’Neill cylinder:

# O’Neill Cilinders

The first two videos are uploaded by CentripetalWorlds. Both feature O’Neill cylinders, video one appears to show, the construction of an O’Neill cylinder.

Two rotating O’Neill cylinders (warning: annoying sound, please mute volume).

A different but related design, the Kalpana One:

The Kalpana One is an interesting design, and quite suitable for the first generation of space settlements (O’Neill cylinders have been considered as a second generation space habitat since they were designed).

For a technical discussion of O’Neill cylinders, by no one less than O’Neill himself, see here.

# Roof gardens and efficient land use

A standard O’Neill cylinder provides about 321.6 square kilometers of usable land. For comparison the surface area of Singapore is 716.1 square kilometers. Since a standard O’Neill cylinder contains only a small amount of land, efficient land use will be essential. (Larger cylinders can be built, but they are unlikely in the early stages of space colonization.) Continue reading Roof gardens and efficient land use

# Public transportation in O’Neill cylinders

In a previous post I discussed the spatial planning of the interior of O’Neill Cylinders. In a note I promised to make another post about (public) transportation inside O’Neill cylinders. For the sake of the argument, I will assume here that the chosen spatial planning is either the Broadacre cityGarden city or Colombia design. Further I want to recall that a O’Neill cylinders has a length of approximately 35 kilometers and a diameter of 6 kilometers (specific dimension may vary among different sources, however the difference is usually only a few kilometers).

A key feature of the design of the O’Neill cylinder is the alternating arrangement of “valleys” (stripes of land) and windows, three of each. It follows from the given dimension that each valley is approximately 3 kilometers wide and 35 kilometers long. Gerard O’Neill himself proposed that there would be parallel to the valley’s heartline a subterranean maglev line. This would function like most subway systems on Earth and would enable (long distance) rapid transit in an O’Neill cylinder. However this system, would not quite suitable for short distance travel, therefore a second transportation system is required.

While the maglev subway will serve as the core of the framework of intra-habitat transportation, there will be finer second network. What requirements do we look for? Ideally we would like an on-demand service, great amount of privacy and the ability to choose our destination. However do not like to waste a lot of time for searching for parking lots. Personal Rapid Transit (PRT) is a proposed idea which would combine the best of private and public transportation.

In order to show what a PRT system might look like, I have selected two YouTube videos about personal rapid transit systems. The first YouTube video (of 8.45 minutes) is about the personal rapid systems as designed by Swedish company Vectus.