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Vertical elasticity coefficient
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E
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Free angle
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 Line diameter
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d
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Gunning angle
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 Outer diameter
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Do
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 Weight
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P
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 Central diameter
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Dm
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Moment
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M
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 Inner diameter
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Di
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 Spring constant
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K
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 Total tendril
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Nt
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 Index rate
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C
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Free length
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L
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 Stress amendment coefficient
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k'
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Fixed length
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a2
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Bending stress
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 Gunning length
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a1
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Tension strength
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For case of a1 + a2 >= 0.09 * * Dm * Nt
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 Spring coefficient calculation :
 K = G * / (3667* Dm * Nt) + 389 (a1 + a2)
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Spring moment calculation :
 M = K * -
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