5V 3/8 sphere geodesic dome

Class I icosahedral breakdown, cut snapped to the nearest vertex ring (achieved portion 35.2%). 275 struts in 9 lengths, 101 hubs, 175 panels. Strut length = chord factor × sphere radius.

Open this geometry in the studio

Struts

Strut	Qty	Chord factor	12 ft dome	16 ft dome	20 ft dome	24 ft dome	30 ft dome	40 ft dome
A	30	0.19815	1' 2 1/4"	1' 7"	1' 11 3/4"	2' 4 9/16"	2' 11 11/16"	3' 11 9/16"
B	50	0.22569	1' 4 1/4"	1' 9 11/16"	2' 3 1/16"	2' 8 1/2"	3' 4 5/8"	4' 6 3/16"
C	20	0.23160	1' 4 11/16"	1' 10 1/4"	2' 3 13/16"	2' 9 3/8"	3' 5 11/16"	4' 7 9/16"
D	30	0.23179	1' 4 11/16"	1' 10 1/4"	2' 3 13/16"	2' 9 3/8"	3' 5 3/4"	4' 7 5/8"
E	40	0.24509	1' 5 5/8"	1' 11 1/2"	2' 5 7/16"	2' 11 5/16"	3' 8 1/8"	4' 10 13/16"
F	10	0.24535	1' 5 11/16"	1' 11 9/16"	2' 5 7/16"	2' 11 5/16"	3' 8 3/16"	4' 10 7/8"
G	40	0.24724	1' 5 13/16"	1' 11 3/4"	2' 5 11/16"	2' 11 5/8"	3' 8 1/2"	4' 11 5/16"
H	40	0.25517	1' 6 3/8"	2' 0 1/2"	2' 6 5/8"	3' 0 3/4"	3' 9 15/16"	5' 1 1/4"
I	15	0.26160	1' 6 13/16"	2' 1 1/8"	2' 7 3/8"	3' 1 11/16"	3' 11 1/16"	5' 2 13/16"
Total	275		391 lin ft	521 lin ft	651 lin ft	781 lin ft	976 lin ft	1,302 lin ft

Cut lengths are hub-centre to hub-centre; subtract your hub's offset at each end.

Hubs

Valence	Qty
6-way	70
5-way	6
4-way	15
4-way (base)	10
Total	101

Panels

Signature	Qty	Area (unit R)
AAD	30	0.0186
BBD	25	0.0224
BCG	40	0.0238
EEF	20	0.0260
EGH	40	0.0269
HHI	15	0.0287
III	5	0.0296
Total	175	4.244

Proportions (per foot of radius)

Height 0.704 × R · floor diameter 1.911 × R
Surface 4.244 × R² · floor 2.867 × R²

Computed by DomeSketch from the icosahedral geometry; the 2V/3V/4V values match the published tables and the test suite asserts it.