The 3, 4, and 5 frequency Kruschke Icosahedral domes
Dome geometry modifications provide coplanar vertices at convenient cut off points located at ground level…see also
The dome base is level with the ground/foundation. In most cases there are fewer varieties of strut (edge) types (lengths), but triangles are more visibly different, compared to conventional geometry (Class 1 Method 1 in Hugh Kenner’s Geodesic Math) that gives more uniform triangle dimensions. The 3, 4, and 5 frequency icosahedral domes are presented here.
3 frequency dome
3 frequency Edge Zenith dome (rotated 31.7°)
4 frequency dome
4 frequency dome rotated 31.7° makes a Hexagon Zenith.Half-triangles on the lower level make the flat base.
5 frequency dome
A family building a 20ft. GD3 EZ