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3v geodesic dome construction

 
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Hello, I'm planning a 3V geodesic dome yurt that will be mounted onto a base wall 150 cm high. if I understand correctly I can make a 4/9 ( a little bit less than a sphere) or a 5/9 a little bit more than  a sphere as the 3V dome will not be flat at the bottom. I believe that the diameter the dome calculators give me is for the sphere and not for the actual structure of the dome which would be either a bit more or a bit less ? If so how can I calculate the actual diameter of the dome in order to make sure it will fit exactly onto the supporting wall ? ( I would like to avoid Kruschke method as I'm making the dome out of individual triangles and additional struts and measurements would complicate the construction. Any suggestions anyone? The picture is of a 2V dome with a diameter of 4,40 cm also on a base wall of 150 cm constructed in Andalucia Spain.
dome-covered.jpg
[Thumbnail for dome-covered.jpg]
 
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Fung Gang wrote:Hello, I'm planning a 3V geodesic dome yurt that will be mounted onto a base wall 150 cm high. if I understand correctly I can make a 4/9 ( a little bit less than a sphere) or a 5/9 a little bit more than  a sphere as the 3V dome will not be flat at the bottom. I believe that the diameter the dome calculators give me is for the sphere and not for the actual structure of the dome which would be either a bit more or a bit less ? If so how can I calculate the actual diameter of the dome in order to make sure it will fit exactly onto the supporting wall ? ( I would like to avoid Kruschke method as I'm making the dome out of individual triangles and additional struts and measurements would complicate the construction. Any suggestions anyone? The picture is of a 2V dome with a diameter of 4,40 cm also on a base wall of 150 cm constructed in Andalucia Spain.



For those not used to metric, the wall is 60 inches, or 5' high.

The picture is of a dome with diameter of about 175" or 13'8".  
 
Robert Jack
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Im new here and just realized this is in the wrong category any way  to change this post into natural building?
 
Deb Rebel
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Robert Jack wrote:Im new here and just realized this is in the wrong category any way  to change this post into natural building?



It was moved to Greenhouses because there are others that have built geodesic structures as greenhouses. Take a look, there may be some information that could be useful.
It is also in Natural Building. Good luck with your project.
 
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Hi Robert, I'm new here too so not sure whether I'm supposed to reply here or try and find this thread under greenhouses?? Anyway...I'm sure the lovely admin folks will work their wizardry and connect the posts.

While researching, I came across this excellent calculator which gives measurements for height, diameter, radius, and circumference, and provides data for both the standard 5/8 and 3/8, as well as the flat base 5/9 and 4/9 Kruschke version. I'm planning to build the 3V, 5/9 Kruschke dome. I could have it all wrong but my understanding is that the only difference between the build of the standard and the build of the Kruschke is a slight difference in 20 of the triangles.

For example, the 3V 5/9 Kruschke build would require the following triangles built:
30 x A = 0.956 m | 9.49°
35 x B = 1.109 m | 11.02°
80 x C = 1.222 m | 12.16°
20 x D = 1.279 m | 12.74°
165 struts

The standard 3V 5/8 (not flat) would require the following triangles built:
30 x A = 1.011 m | 10.04°
55 x B = 1.170 m | 11.64°
80 x C = 1.196 m | 11.90°
165 struts

Both require the same amount of struts (165), just the dimensions are slightly different, which results in an extra 20 type 'D's, but 20 less type 'B's in the Kruschke version. And you get a nice flat edge to work with too.

Hope this helps. Its a bit of a minefield out there in the geodesic dome building world!




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