Actually no, the biggest movement is close to you.
Hence they are semi-useful IMHO.
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Would the projectile going faster mean the wind is less effective unlike when its far out slowed down the wind will have more power over it?
It does have the biggest effect, but the least distance to drift away. So say 1moa deflection at 900m, to a 1000m target, so 100m to travel = 1inch off. Say 1/2 the deflaction on leaving the gun, say 0.5moa deflection at 100m to a 1000m target is is 900m to travel how many inches off?
I bought a dx.com $19US delivered wind meter. I think its good enough so get you close enough ie there are so many changes and variables at say 1000m with a 2second flight that I'd take a lot of convincing anything more expensive, does better than $19US and use of brain cells.
regards
kestrel 2500 does every thing you need
Full stop
Yes but nearer the target there is less time/distance/flight path left to move the bullet off.
So the art is really looking close, mid and far and thinking. I try and look at about 1/3rd way as my main correction and tweak it a bit at 2/3rds. Listening to the old guys I think it takes 10 years+ to stand a decent chance of reading the wind right most of the time....or maybe im just slow.
Hey, hey, it's physics Friday :thumbsup:
@Gillie and @veitnamcam, remember this debate ?
So I was watching the Litz DVD last night, and here is what the man himself says:
It is commonly misunderstood that the wind blows on the side of a bullet, and that is simply not accurate.
Because a bullet is stable it will point its nose into the wind.
It will align it's axis with the gross air vector (which will be at an angle to the line of sight due to crosswind). The aerodynamic air vector is always aligned with the bullet axis. The small lateral component of aerodynamic drag force is what will act to pull the bullet away from the line of sight.
man having a headache and reading that wasnt a good idea
I got one of these Wind Meter Specifications ? Shaka ? Weather Station Reinvented
does the job
Some more "geek" reading for those that are interested.
Pretty good info on forces involved in exterior ballistics. Interesting stuff about Magnus effect, and very cool info on yaw for over-stabilised projectiles - explains why a too short twist rate will cause a projectile fired at high angle to hit base first...
How do bullets fly?
To answer an earlier question, it's the wind nearer the shooter that demands the most attention. Ask any experienced NRA shooter.
One way of looking at that issue is that any deviation in the early stages is multiplied many times over the total flight