How this dome works:
This dome is a hypersphere of 220°, reaching below the horizon. It consists of two hyperspherical air tight fabric hulls, an outer one and an inner one (the projection canvas). Between them, there is a geodesic framework that simply supports the outer hull. At the bottom (i.e. the spring line of the dome) the inner and the outer hull meet at an airtight Velcro® fastener. There is no other attachment of the inner hull to the rest of the structure. Once the space between the two hulls is evacuated, the inner hull is sucked into the cavity formed by the outer hull: The dome pulls itself into a perfect spherical shape, simply by the force of negative pressure.
The term Geodome does not refer to the trademark by THE ELUMENATI.
General dimensions:
- 6 m inner diameter
- 6.3m outer diameter
- 4.25m height without supporting struts
- 6.3m height on supporting struts
Weight Table:
- 52.6 kg geodesic structure
- 28.8 kg spring line foundation ring
- 51 kg metal pillars
- 13.14 kg support struts on the floor
- 3.5 kg screws
- 22 kg outer hull
- 25.8 kg inner hull
- 5.1 kg spring line joint
- 2.8 kg fan
Geodesic Structure:
- no piece is longer than 2m
- framework consists of 300 individual parts
- made of PVC and PE tubing
- assembles easily through standard screws
- assembly time approx 2 hours with 2 people, 6 hours alone
- it really helps if you have a crane and some sturdy ladders
- the supporting struts are 2m long and vertical, kept in place by metal wire.
Fabric:
- inner dome: cotton coated polyamid (?), plain white
- outer dome: nylon, white, coated on inside
- you can read this webpage through the outer hull! It’s a rear projection canvas!
- the inner hull is light tight
- negative pressure is -23 Pa
- inner hull needs about 15 minutes to settle in place, depending on fan