Windtest of vane for arrows
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Windtunnel speed 60 m/s. |
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Arrow Easton ACE 520 30 inch |
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Vane 45 mm |
Weight (gr) |
Drag force (mN) |
Rev/sek |
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3 Spin-Wing |
19,0 |
147 |
80 |
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5 Spin-Wing |
19.1 |
186 |
125 |

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Arrow shot to a target at a distance of 18 meter |
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Vane 45 mm |
Start speed |
Calc. Finish speed |
Revolutions |
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3 Spin-Wing |
60 m/s |
57,7 m/s |
App. 24 |
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5 Spin-Wing |
60 m/s |
57,0 m/s |
App. 37 |
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Speed Measuring with Arrow Speedometer ver. 1.0 |
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Vane 45 mm |
Start speed |
After 17 meter |
Average |
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3 Spin-Wing |
Av. 60.43 m/s |
Av. 58.5 m/s |
5 Arrows |
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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