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ENGELWING |
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Engelwings
are made by pinging tetrahedra together by their edges to form |
a double
wide chain. The chain can be bent into a loop in either direction. |
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Fig. 317 Engelwing |
click image to enlarge |
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The Engelwing is identical
to the Square-2 lattice structure shown in the
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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. |
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 |
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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Fig. 318 Tapered Engelwing |
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Sammy |
swoop |
small
ani. 5K |
ani. 6K |
larger
ani. 14K |
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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 |
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