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Inspired by Steve DeCraemer's (URL) S.P.U.> (picture by Rob Hendrix) first shown at Brickfest 2003, I decided to build a bigger version. Six BrickLink orders, over 4000 pieces, 180 triangles - and this is what I came up with. (2 URLs) Gallery (after (...) (21 years ago, 15-Sep-03, to lugnet.announce, lugnet.build.sculpture, FTX) !
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| | Re: icosahedron in soccer-ball style
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(...) Wow...I love it. What an enormous untaking. What a great meditative project. Makes me want to try a five-color icosidodecahedral net version. Or maybe some other stellated forms. Your model proves anything is possible. --Dave (jot and jab) (21 years ago, 15-Sep-03, to lugnet.build.sculpture, FTX)
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| | Re: icosahedron in soccer-ball style
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Hi John, (...) Sure I do ! You say in (URL) text> "But for some reason I didn't realize that the flat faces of the pentagons would line up with the ajoining hexagon" Actually the problem is that triangle in the pentagons should not be equilateral. (...) (21 years ago, 15-Sep-03, to lugnet.build.sculpture, FTX)
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| | Re: icosahedron in soccer-ball style
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(...) Yup, I realize that now. Holding the big ball in your hands can really make those ideas clear! The problem is, how to do it within the limits of the "Lego System"? I want to experiment with other triangle sizes, and see what happens and what (...) (21 years ago, 15-Sep-03, to lugnet.build.sculpture, FTX)
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| | Re: icosahedron in soccer-ball style
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(...) Thanks! I was very surprised at the strength of Steve's method of joining the triangles. If you're making something *really* large, you might have to brace each triangle with a second set of hinges on the corners. Don't know how well it shows (...) (21 years ago, 15-Sep-03, to lugnet.build.sculpture, FTX)
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| | Re: icosahedron in soccer-ball style
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(...) Originally I thought of using 2x1 plates with one stud to get a 1/2 stud value, but your 6/5/5 idea is probably (much) better. The precise value is 6/5.1/5.1 so here the pentagons will be taut and flat. There is probably enough slack in the (...) (21 years ago, 15-Sep-03, to lugnet.build.sculpture, FTX)
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(...) Well... I tried to build a pentagon (using solid 2x5 structures in the middle) and I was not able to close it (too much tension). Perhaps with the bar and holes it would work ? Philo (21 years ago, 15-Sep-03, to lugnet.build.sculpture, FTX)
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| | Re: icosahedron in soccer-ball style
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(...) I don't have the parts to try this out, so my suggestion may be highly disposable. How about making each black triangle a 4/3/4? By this I mean: each black/white join would be 4/4, and each black/black join would be 4/3. The pentagon wouldn't (...) (21 years ago, 16-Sep-03, to lugnet.build.sculpture, FTX)
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(...) I tried 4/3/3 - but it didn't work. The triangles couldn't connect to form the pentagon. The other problem is since I'm using the 1x4 hinge plates, if you go shorter than four studs on a side of the triangle you have to come up with a (...) (21 years ago, 16-Sep-03, to lugnet.build.sculpture, FTX)
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John, I really enjoy seeing the creations you come up with. Thank you. Eric Sophie (21 years ago, 16-Sep-03, to lugnet.build.sculpture)
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| | Re: icosahedron in soccer-ball style
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Well, that's weird. My original message said: (...) But you're copy of it said: (...) I wonder how that got mixed up? < shrug > Anyway, back to my original idea. The reason I had suggested 4/3/4 was based on Phillippe's formula of 4/3.5/3.5 -- (...) (21 years ago, 16-Sep-03, to lugnet.build.sculpture, FTX)
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| | Re: icosahedron in soccer-ball style
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(...) I changed it, because I was thinking you meant that each of the black triangles would have one side of length 4 (that connects to the white hexagon), and two sides of length 3 (that connect to the two ajoining black triangles within the (...) (21 years ago, 16-Sep-03, to lugnet.build.sculpture, FTX)
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| | Re: icosahedron in soccer-ball style
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(...) Or you can go simpler: if you suppress the triangles inside the pentagon, the problem disappear! But the structure may look somewhat hollow... Philo (21 years ago, 16-Sep-03, to lugnet.build.sculpture, FTX)
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| | Re: icosahedron in soccer-ball style
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(...) Hoo, boy. How to explain without pictures? Hmmm... okay here goes... Suppose the following represented two black triangles set side by side, touching at one vertices... _ _ \/ \/ The sides represented by "_" are 1x4's connecting to white 1x4's (...) (21 years ago, 16-Sep-03, to lugnet.build.sculpture)
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| | Re: icosahedron in soccer-ball style
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Ok, now I understand what you're going for. Interesting idea! And I can imagine why you refered to it as a "pinwheel"... :-) I was stuck on using the equalateral triangles due to me having a large collection of (URL) Polydron> (gasp! A different (...) (21 years ago, 16-Sep-03, to lugnet.build.sculpture, FTX)
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