Is it one of the kestrel bunch?
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Is it one of the kestrel bunch?
The trouble with anonometers is that you can't read them down the end of the range that really counts.
If it is just wind then any of them will be good enough, the kestrel is good if you want pressure and humidity. But if you just set humidity to 50% it will be close enough out to 1000 yds, pressure can be got from a Garmin 62s or similar, if you have one of those.
My wind meter cost $30 from memory
I have a Kestrel2500. Only just got it from off EBay the other day so can't say much else. Temp and hPa is nice to include. Just make sure ref alt is set at 0m to give true station pressure.
If its good enough for Norway then it's more than enough for me is my thinking.
Attachment 11766
Huh? Wind at the target matters... as does wind at the firing point... as does wind along the entire projectile path. I would be less worried about 1" of drift in the last 100 yards of trajectory than i would be about 1" of drift in the first 100 yards. Wind meters are great to give you an indication of wind speed at your location. You can use this information to make a slightly better informed decision about the effect of the wind along the bullets entire trajectory.Quote:
Originally Posted by Rushy
I have a kestrel 2500... it works well. I didn't bother getting one with all the bangs a whistles and truth be told i tend to use vegetation more than the kestral when judging wind effect. Norway put together a cool video demonstrating using vegetation to judge wind.
what wind meter is that Stug?Quote:
Originally Posted by stug
yea I had a copy of that video when I lived down in chch before the earthquakes, computer died of anxiety apparently, anyone got a copy online I can download or get emailed?
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.Quote:
Originally Posted by Gillie
Sweetas Rushy your understanding is pretty good. Certainly a logical arguement... but... for arguements sake i'll pose a simple theorectical example :)
I shoot a flash bang calibre... that fires a bullet at 3000fps (at the muzzle), when that bullet reaches 1000m it is going only 1500fps.
I fire my first shot at a 1000m target. There is a 2m/s wind from 9 o'clock between 0m and 100m. This shifts my bullet off path by 2cm at 100m. With no other wind when my bullet gets to the target at 1000m it has drifted 20cm total.
I fire my second shot at the same 1000m target. There is now a 2m/s wind from 9 o'clock between 900m and 1000m. Ignoring slight variations in the projectiles BC due to its slower velocity because the bullet is going half as fast lets say it drifts twice as much - so 4cm total.
Yes, yes i know. What about the elevation effect of the wind, coriolis effect, spin drift.... i thought pulling the trigger harder would make the bullet go faster, the cross hairs weren't on the center of the target... that's why i said a simple example. There are some very smart shooters on here though and i'm sure they'll comment on this example :thumbsup:
Well now I just won't sleep for a week. Damn you Gillie Ha ha ha haQuote:
Originally Posted by Gillie
Not to worry Rushy. If yah missus complains she can't sleep cause you can't, just tell her this example. She should nod straight off!! :D
Might just tell it to her anyway just to see her eyes water and glaze overQuote:
Originally Posted by Gillie
Rushy, it gets a whole lot worse. Wind can be toward or away from you, left to right, or up and down ... think fluid movement in 3 dimensions.
Bullets don't actually get blown of course. Drag causes a spin stabilised projectile to turn into the wind.
Your logic works for gravity, but wind is a very different story.
exterior ballistics or Applied Ballistics by Bryan Litz
Now I won't sleep for a month. Damn science. I am surprised that a bullet can make it out of the fucking barrel now.
Not that I am great a reading the wind (its my kryptonite when shooting longrange) but Gillie is correct. The example provided is logical about the wind at the shooters end having the most effect.
kj
If it turned into the wind and didn't get blown off course you would impacting right in a right to left wind.Quote:
Originally Posted by ebf
Everything gets blown off course even 100000 ton ships
Sent from my GT-S5360T using Tapatalk 2
Even Men have been Known to be blown of course:PQuote:
Originally Posted by veitnamcam
That deep Neckshot :D
VC, here's Wikipedia's version, maybe they explain it better than I tried to:
Wind has a range of effects, the first being the effect of making the bullet deviate to the side. From a scientific perspective, the "wind pushing on the side of the bullet" is not what causes wind drift. What causes wind drift is drag. Drag makes the bullet turn into the wind, keeping the centre of air pressure on its nose. This causes the nose to be cocked (from your perspective) into the wind, the base is cocked (from your perspective) "downwind." So, (again from your perspective), the drag is pushing the bullet downwind making bullets follow the wind
I was referring to the golf course:DQuote:
Originally Posted by ebf
that's pretty techo, EBF. I just look at the smoke coming out of the house next door chimney. gives wind direction and speed kinda......works most of the time
Yup, the old lick your finger and stick it in the breeze also works, just not that good for 1000 yard compos ;)
Although per inch moved yes the wind will deflect the bullet more at the end there are so few inches left to move it doesnt matter as much as the wind when it leaves the rifle. A small deflection when the bullet has 1000m to go makes a bigger difference...Quote:
Originally Posted by Rushy
Did I show you my $18 anemometer one from dx.com? Im very impressed with it....Quote:
Originally Posted by ebf
I bought an $18 one from dx,com, its good enough IMHO to get me onto the target....ie tells me the wind is varying 8~12kmh (say) so pick a mean of 10, I know the range so I have a band of MOA to choose from I look downrange and try to judge if it looks stronger or weaker or a different angle and pick a sighting shot MOA from that and off I go....For $18 its helped a lot IMHO...I really wonder that a $100 unit would have helped any more...
The other thing I do is a wander about looking around me and take a reading to try and get my eyes to better judge wind....not getting to far at the moment though.
Jkey should be nervious, I often check out the flag on top of the beehive.....I mean tell an assasin what the wind is doing outside his window why dont you....doh.
;]
If the wind blows the bullet will go off course if the wind dosn't blow it wont so you can argue that the bullet is indeed being blown off course or to put it another way yes the wind will cause the projectile to point into the wind(become weather cocked) which will increase drag but does drag create sideways movement ? If the body of air wasn't moving neither would the bullet.
Great thread guys.
I'm a Surveyor, I understand the effect of air pressure etc on the travel of particles. We correct for this every day with lasers and distance measurements etc. Lasers are just like a whole lot of little bullets going really fast. The example Gilli has made, along with the survey example, once explained to the wife is the faster and easiest way to move the point of impact of the request to purchase a wind meter from "no way, you spend to much on this shit already" to "whatever, I'm going to sleep!".
This is prefect!
The push argument is purely word twisting.
As in there is no such thing as suction instead there is only the absence of pressure.
Same same wind does not push a bullet off course it sucks (no such thing as suction) it due to the low pressure on its windward side where ever that may be.
End result wind blows left bullet impacts left.
And if your really bloody pedantic up a bit as well for most rifles
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I think the reason for describing the lateral force from the wind as a force along the altered axis of the bullet is 1) emphasises that the bullets axis does quickly change to align into the wind (also perturbing its' flight with "aerodymanic jump") and 2) to make it clear the airflow will be parallel to the bullets axis so the force on the bullet is from its nose, not the side. This means that the wind deflection depends on the ballistic coefficient, not its profile area, length etc. Litz explains this in his Applied Ballistics but its really best not to try to read it at bedtime in my experience.
Or to put it simply wind blows ..shit moves.
Now that I understand Sneeze. Ha ha ha haQuote:
Originally Posted by sneeze
I think I can feel my brain melting out my ears
thank god someone invented ballistic calculators
Distance -
angle-
Wind speed -
Wind direction -
BC-
weight-
velosity-
Bang.
Hit. Well done
For wind estimations I work off;
How much baked beans were eaten, as it is directly proportional to the amount of wind produced.
If you want to shoot straight don't eat too many and there won't be to much wind
all I really need is the wind speed meter now, hence the question.
Im keen to hear what the 30$ option is, and where to buy a kestral at a good price.
sitting on the top of a hill last night thinking I have no idea what to add in as a correction defintly gives me a push to get one
Here it is has gone up to $39 Anemometer Beaufort Scale Digital Wind Speed Meter | Trade Me I tested it by holding out the window while driving at 50kph, it gave the right speed. Good enough for me.
Found another one only $23 closes in 3 hours Digital Wind Speed Gauge / Wind Sport Anemometer | Trade Me
how good is it for input and accuraccy with putting bullets on target stug?
Im guessing low speed wind would be the hardest for a little meter to read
Seems OK, gives similar wind readings to my mates Kestrel 3500. I have made some tricky shots in the wind with it. The last one was the spiker I shot at 634yds ( I posted the video of that shot on here http://www.nzhuntingandshooting.co.n...er-video-3923/). Most of your ability to hit in the wind is what you do with the wind reading, not what it actually is. Inside 600 yds being a few mph out won't make much difference.
The best shot have made in the wind (with this wind meter) I had to allow for a strong head wind from 2 o'clock, but also had to allow for the lift generated by the wind as it blew up the slope towards me. From memory it was a 450ish yd shot on a pig, hit it exactly where I was aiming.
Thanks Stu, purchased one last night for $24 - Long range deal of the year! ;-)
Will put it through the same testing procedure that you did ;-)
An exercise in simplicity I'm sure but would it be true to say.....
that one inch of drift approximating 1 MOA at 100m with continue to be 1 MOA = 10" approx drift at 1000m with no further wind
And no wind 0-900 but 1 inch of drift 900-1000 will result in 1 inch total dirt = 0.1 MOA....
Same amount of wind at different ranges...?
I assume this is why we average the wind for the total distance calc?
There seems assumption that if the wind has blown the bullet off 1 inch at 100yd it will be 10 inch off at 1000yd without any more interaction from wind after the 100yd. To me this doesn't seem right because that would mean that the bullet would have had its direction of travel changed, I think that it would more likely be blown onto an almost parallel course one inch off its original path, not perfectly parallel but certainly close.
Thoughts?
