Author Topic: Wind drift experiment (where to measure the wind)  (Read 437 times)

Windmeister

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Wind drift experiment (where to measure the wind)
« on: January 09, 2017, 03:42:20 PM »
There has always been a big discussion amongst competitive shooters about where to place windflags/devices.
Myself and others retain that the most important place is somewhere in the first 1/3 distance from you towards the target. Some feel it's counter intuitive since the pellet goes slower near the target, etc etc.
Now I set up a simple test in Chairgun (from Hawke Optics).
Shooting .22, JSB 18gr at 895fps.

Wind is split in 3 equal sectors along the distance to the target.
The wind blowing directly from one side 90 degrees.

Test 1:
First sector has zero wind, dead calm.
The two next sectors have 5mph wind.
Drift on target (100yds) = 1.81"

Test 2:
First sector 5mph wind.
Next two sectors zero wind, dead calm.
Drift on target (100yds) = 5.06"

Test 3:
All sectors have 5mph wind.
Drift on target (100yds) 7.16"

Test 4:
First sector 5mph wind at 90 degrees.
Next two sectors 5mph wind at 270 degrees (opposite direction)
Drift on target (100yds) 3.25"

Test 5:
How much wind in the opposite direction in the last two sectors is needed to get it back to zero drift?
If the first sector has a wind speed of 5mph, the next two sectors need 14mph wind in the opposite direction to be able to push it back to zero at 100yds.