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ENGELWING |
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Engelwings are made by pinging tetrahedra together by their edges to form |
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a double wide chain. The chain can be bent into a loop in either direction. |
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| The Engelwing is identical to the Square-2 lattice structure shown in the | |||||||||
| previous lesson. It takes advantage of the inherent instability imparted to | |||||||||
| the lattice when it was sliced out of the octet truss parallel to the (100) | |||||||||
| plane thus cutting the octahedra in two and exposing their square shaped | |||||||||
| cross sections. This allows the structure to flex in and out unless it is braced | |||||||||
| with a diagonal strut or a bracing plate is fastened to the face of the square. | |||||||||
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As the wing flexes each tetrahedron acts as both a hinge and a lever that |
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| forces adjoining tetrahedra to flex. You can build Engelwings from regular | |||||||||
| tetrahedra made with equilateral triangles, and irregular tetrahedra made | |||||||||
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with different combinations of the of the Polymorf triangles. This lets you |
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make tapered, bird-like wings for example. |
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click image to enlarge |
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Sammy |
swoop |
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Click image to enlarge. Click text below image to see it animated, |
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back |
Page 167 - Gizmo - Engelwing |
forward |
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