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Helices
A helical construction made of pentagonal and rhombic prisms:
All the helices below are octotetrahedric, meaning that they are built using the module in this picture, made of an octahedron and two tetrahedra:
GEOMAG constructions: Module for the octotetrahedric helices, view 1
Module for the octotetrahedric helices, view 1
In all of them, the modules are placed as shown in the following picture. All the joints are made by means of vertical rods. The red ones in the octahedron attach the modules to the support structure, and the yellow ones in the tetrahedra attach the modules to one another, acting as hinges:
GEOMAG constructions: Module for the octotetrahedric helices, view 2
Module for the octotetrahedric helices, view 2
For the following helices, the pitch (the number of modules used for a complete turn) is 10:
One of pitch 15:
And another one of pitch 18: