Thread: Which is the best wind meter for wind estimation

Originally Posted by Rushy

The trouble with anonometers is that you can't read them down the end of the range that really counts.

Actually no, the biggest movement is close to you.

Hence they are semi-useful IMHO.

Originally Posted by BRADS

Gold mate just don't use my excuses I will need them all.

As long as you don't use my excuse of "can't see it? Must be in the black then"

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?

Originally Posted by Rushy

Gillie I will bow to you considerably greater knowledge on this matter. My understanding to now has been that wind has the greatest affect on a projectile's flight at the target end where the projectile is travelling slowest and dropping quickest. What I was alluding to above was that a hand held device cannot measure wind at target (unless you happen to be at the target) and that wind variables (speed, direction) could be completely different from those at the shooting position down at the target position. Bill999, however Gillie responds to this (or not) be guided by his advice over my comments.

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

Originally Posted by Callum

As long as you don't use my excuse of "can't see it? Must be in the black then"

That's been my go two call lately

kestrel 2500 does every thing you need
Full stop

Originally Posted by Toby

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?

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

@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

Originally Posted by Bill999

man having a headache and reading that wasnt a good idea

Bill wet your finger and stick it in the air. The side the wind is blowing from will get coolest first. Pick some grass and drop it from shoulder height. That should confirm your finger result. Now you have wind direction sussed and only have to work out speed.

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