An analysis of bow limbs
Bow: Variable with Stylists
limbs, 35#, 66",
draw length 48 cm (measured from the brace height)
To measure the stored energy,
the
"Bow Power meter" ver 0.1
and Windows Excel
were used.
12 measurements showed 42.94 Joule.
48 measurements showed 43.00 Joule.
To find the equation describing
arrow velocity vs arrow mass,
the
Arrow Speedometer ver 1.0
and Windows Excel
were used.
v = arrow velocity in m/s
W = energy stored in the bow (Joule)
m = arrow mass (kg)
virtual mass (kg)
The virtual mass
is linearly dependent on
the arrow mass within the measured range.
This might be ascribed to the string elasticity.
Calculation from measured data yields:
0,0583 =
string elasticity factor
( FastFlight, 50 turns )
x = arrow mass (g)
5,7697 g = the virtual mass of the bow
limbs with no arrow