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Cylindrical Habitats - Horizontal or. Vertical ?. Gary C. Fisher The Mars Foundation GFisher@MarsHome.org Rutgers University Symposium On Lunar Settlements Piscataway, NJ June 5, 2007. Background and parameters of this work.

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cylindrical habitats horizontal or

Cylindrical Habitats - Horizontal or

Vertical ?

Gary C. Fisher

The Mars Foundation

GFisher@MarsHome.org

Rutgers University

Symposium On Lunar Settlements

Piscataway, NJ June 5, 2007

background and parameters of this work
Background and parameters of this work

The Mars Foundation’s Mars Homestead Project is an ongoing effort to define the first self-sufficient settlement for Mars.

This effort produced an initial design, “The Hillside Base” using habitat structures, mostly cylinders, constructed on site from in situ materials over the course of 6 to 8 years by 12 people.

the hillside base
The Hillside Base

Graphic by Georgi Petrov for the Mars Foundation

the plains base
The Plains Base

Graphic by Adam Burch for the Mars Foundation

the plains base5
The Plains Base

Graphic by Adam Burch for the Mars Foundation

three generations of habitats benaroya 2006
Three Generations of Habitats (Benaroya 2006)
  • Prefabricated and preoutfitted hard shell modules.
  • Assembly of components fabricated on Earth with some assembly required; and
  • Large scale building structures comprised substantially of indigenous materials.
the criteria of interest then are
The criteria of interest then are:
  • Ease of assembly both from the standpoint of low labor input, but also requiring minimal tooling, especially imported tooling.
  • Ease of transport of the finished structure.
  • Ease of deployment – site preparation, positioning, attachment
  • Thermal characteristics
  • Radiation shielding – ease of applying a regolith cover
  • Useful life
  • Useable interior space
  • Pressure retention
  • Site independence – build and deploy these almost anywhere on the Moon.
why cylindrical habitat structures
Why Cylindrical Habitat Structures ?

For the purposes of creating in situ habitable spaces for a Lunar settlement, cylinder-shaped structures present the best near-term option over alternatives, such as:

- spherical or dome structures

- excavated structures

- lined lava tubes

- inflated structures (noncylindrical)

- regolith covered masonry vaulted arches.

cylindrical habitat structure options
Cylindrical Habitat Structure Options:

- Length

- Diameter

- Hemispherical or flat end caps

- Rigid or inflatable

- True cylinder, ellipsoid or flattened

- Single or multi-wall

The primary consideration, however, is whether to stand the cylinder up vertically on an end, or lay it down horizontally on its side.

proposed
Proposed:

That the simplest, safest, and easiest to deploy cylindrical habitat would be one that has a flat end on which it is stood up like a beer (or tuna) can, one story high, with the top end cap being hemispherical.

These would be connected via smaller diameter cylindrical connector modules that can also be used as air locks.

The modules would have domed solar tubes, that can double as emergency exits, to pipe sunlight down through the regolith cover into the structure to provide some of the interior illumination.

proposed12
Proposed:

Lunar 2.5 m / Mars

Floor area is 6.05 m^2 (65.12 ft^2)

proposed13
Proposed:

NASA Diameter is 3.65m

so why not horizontal habitats
So why not horizontal habitats?

<- ISS Destiny Module

BIOPLEX at JSC ->

so why not horizontal habitats15
So why not horizontal habitats?
  • They roll!

2. Footings are more complicated.

  • They are hard to connect.

4. Hard to cover with regolith.

5. Limited full headroom.

so why not horizontal habitats17
So why not horizontal habitats?

There are a number of alternative approaches:

Attach legs (most likely attached to U-shaped cradles) to the cylinder that rest on pre-constructed footings and allow for some height adjustment.

so why not horizontal habitats18
So why not horizontal habitats?

Put the cylinder inside a box frame which is then positioned on a pre-constructed footing.

so why not horizontal habitats19
So why not horizontal habitats?

Consider this manageable size horizontal habitat.

Floor area is 18.77 m^2 (202.04 ft^2)

so why not horizontal habitats20
So why not horizontal habitats?

Linear deployment has safety issues.

so why not horizontal habitats21
So why not horizontal habitats?

Connectors help solve the escape route problem.

so why not horizontal habitats22
So why not horizontal habitats?

Connectors help solve the safety issues, but how do you cover this with regolith?

so why not horizontal habitats23
So why not horizontal habitats?

Connectors in series allow for closer packing.

so why not horizontal habitats24
So why not horizontal habitats?

What is a manageable size?

How much headroom depends upon where you put the floor.

vertical habitat arrangements
Vertical Habitat Arrangements

4 Connections 6 Connections 3 Connections

vertical habitat arrangements26
Vertical Habitat Arrangements

2 Doors 6 Connections

new conclusion put your cylinders in boxes
New Conclusion: Put your cylinders in boxes!

Graphic by Adam Burch for the Mars Foundation