Windtest of vane for arrows

Windtunnel speed 60 m/s.

Arrow   Easton ACE  520   30 inch 

Vane 45 mm

Weight (gr)

Drag force (mN)

Rev/sek

3 Spin-Wing  

19,0

147

80

5 Spin-Wing  

19.1

186

125

 
 

Arrow shot to a target at a distance of 18 meter

Vane 45 mm

Start speed

Calc. Finish speed

Revolutions

3 Spin-Wing  

60 m/s

57,7 m/s

App. 24

5 Spin-Wing  

60 m/s

57,0 m/s

App. 37

 

Speed Measuring with Arrow Speedometer ver. 1.0

Vane 45 mm

Start speed

After 17 meter

Average

3 Spin-Wing  

Av. 60.43 m/s

Av. 58.5 m/s

5 Arrows

5 Spin-Wing  

Av. 60.35 m/s

Av. 57.7 m/s

5 Arrows

Look at Bow Limb analysis on this website

Arrow ACE 520 (with 3 Spin-Wing) m=0,019 kg
Wind speed 60m/s
Arrow rotation 80 r/s
Drag force F (24-9)x9,81/1000=147m N
Arrow speed loss a in m/s/s
a=F/m  a=0,147/0,019=7,7 m/s/s

If this arrow is shot with an initial velocity of  60 m/s,
it will be slowed down to 53,1 m/s  after  1 s  and  56,3 m.

Arrow ACE 520 (with 5 Spin-Wing) m=0,0191 kg
Wind speed 60m/s
Arrow rotation 125 r/s
Drag force F (28-9)x9,81/1000=186mN
Arrow speed loss a in m/s/s
a=F/m  a=0,186/0,0191=9,7 m/s/s

If this arrow is shot with an initial velocity of  60 m/s,
it will be slowed down to 51,6 m/s  after  1 s  and  55,5 m.

 

The target is  at the same level, and the calculations are
simplified, (the drag is supposed to be independent of
velocity from 60 to 50 m/s and the drag effect of fish-
tailing is ignored).
 

 

For more info: bertil@mvvf.net


 

 

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