Green Blue Yellow Red Notes
k = Rate 1 2 3 4
OD = Outside diameter 33 33 33 33
d = Wire diameter 1.8 1.8 1.8 1.8
E = Youngs Modulus ( 210000 ) 210000 210000 210000 210000 N/mm2
FL = Free length 52 47 42 36 Un-compressed
WL = Working length 30.8 30.8 30.8 30.8 Pre-compressed
P1L = Position 1 length 25.8 25.8 25.8 25.8 Full Working Compression
n = Total Number of coils 4.5 4.5 4.5 4.5 Active coils (6.5 coils in spring)
D = Mean Diameter 31.2 31.2 31.2 31.2
Rate K= Ed*4 / 8n D *3 1.70 1.70 1.70 1.70 N/mm
Load @ Breakout BL = FL-WL x k 36.12 27.60 19.08 8.86 N
Load @ P1L SoL = FL - SL x k 44.64 36.12 27.60 17.38 N
Stress= 8 x P x D / 3.14 x d *3 608.50 492.38 376.25 236.90 N/mm2
% UTS ( M4 Music Wire ) 30.89 24.99 19.10 12.03 %
9
F.E.E.L. Spring Tension System
Each spring placed on the Rhino stick shaft will give a different feeling. You can also operate the stick
without a spring, providing a total of five different forces.
Each spring has a unique feel and different identification. These identifiers are color swatches at the
top of each spring – Red, Yellow, Blue, and Green. This table lists some of the calculations used for
differentiation:
