Chord factors are pure numbers which when multiplied by the radius of the dome give you the length of a strut. If your dome requires 3 different lengths, then you will have 3 distinct chord factors, one for each length.

Below we provide chord factors for geodesic domes of frequency 1V up to 8V, based on method 1 (Icosa-based). You will also find the bend angles for each strut length.

## 1V geodesic dome chord factor

15 3-sided faces
A X 25 1.05146  31.72°

## 2V geodesic dome chord factors

40 3-sided faces
A X 35 0.61803 18°
B X 30 0.54653 15.86°

## 3V geodesic dome chord factors

3/8 =75 3-sided faces, 5/8 = 3-sided faces 105 faces
A X 30 0.34862 10.04°
B X 40 0.40355 11.64°
C X 50 0.41241 11.90°

## 4V 1/2 method 1 dome chord factors

160 3-sided faces
A X 30 0.25318 7.27°
B X 30 0.29524 8.47°
C X 60 0.29453 9.35°
D X 70 0.31287
E X 30 0.32492 8.59°
F X 30 0.29859 9.35°

## 5V geodesic dome chord factors

7/15 =225 3-sided faces 8/15 = 3-sided faces 435 faces
A X 30 0.19814743 5.69°
B X 30 0.23179025 6.48°
C X 60 0.22568578 6.65°
D X 60 0.24724291 6.66°
E X 50 0.25516701 7.04°
F X 50 0.24508578 7.05°
G X 30 0.26159810 7.10°
H X 30 0.23159760 7.33°
I X 10 0.24534642 7.52°

## 6V geodesic dome chord factors

360 3-sided faces
A X 30 0.16256722 4.66°
B X 30 0.19047686 5.22°
C X 60 0.18190825 5.38°
D X 90 0.20281969 5.47°
E X 30 0.1873834 5.68°
F X 60 0.19801258 5.82°
G X 130 0.20590774 5.91°
H X 65 0.21535373 6.18°
I X 60 0.21662821 6.22°

## 7V 10/21 geodesic dome chord factors

455 3-sided faces
A x 30 0.13774 3.95°
B x 60 0.15197 4.36°
C x 30 0.15664 4.49°
D x 30 0.16154 4.63°
E x 60 0.16480 4.73°
F x 30 0.17066 4.90°
G x 60 0.17098 4.90°
H x 60 0.17132 4.91°
I x 50 0.17353 4.98°
J x 70 0.17585 5.04°
K x 50 0.18155 5.21°
L x 30 0.18161 5.21°
M x 50 0.18237 5.23°
N x 60 0.18548 5.32°
O x 30 0.1879 5.39°

## 8V geodesic dome chord factors

640 3-sided faces
A x 30 0.11946 3.42°
B x 60 0.13033 3.74°
C x 30 0.13424 3.85°
D x 30 0.14018 4.02°
E x 60 0.14056 4.03°
F x 60 0.14548 4.17°
G x 30 0.14628 4.19°
H x 60 0.14803 4.24°
I x 60 0.14862 4.26°
J x 60 0.15267 4.38°
K x 70 0.15296 4.39°
L x 30 0.15315 4.39°
M x 60 0.15477 4.44°
N x 90 0.15636 4.48°
O x 60 0.16033 4.60°
P x 30 0.16036 4.60°
Q x 70 0.16088 4.61°
R x 60 0.16300 4.67°
S x 30 0.16465 4.72°

If you are looking for an advanced explanation of chord factors, bend angles and varying truncations, simplydifferently.org has an extensive and impressive information site on geodesic domes and other structures.

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