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The first shape transformation of a Curvy Copter and the second tetrahedron with this axis system.
Only weeks after the Celtic tetrahedron the Helicoptrahedron follwed. Both have the shape of a pillowed tetrahedron and have the axis system of edge-turning hexahedron. The Helicoptrahedron was handmade from a CurvyCopter for which mass production started only 3 months ago.
Since the symmetry groups of hexahedron and tetrahedron are not isomorph this puzzle changes its shape even when only 180° moves are used. But their symmetry group are so similar, that there are only 5 differently shaped pieces compared with 3 of the original puzzle. Like the original puzzle this one allows jumbling moves.
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Thank you to the following people for their assistance in helping collect the information on this page: Andreas Nortmann.
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