Wind Reading
- Thread starter NV Highpower
- Start date
Yes, thereabouts. Gusts and let ups caused about a 10 MOA spread. Shot a group about 20" high and 40" wide. All 15 record shots stayed on paper. I thanked the coach for keeping me on paper with his wind doping.
Got a bit worse at 900 and 1000 yards.
"Observations of mirage? …./, …..\, …..|"
I only use mirage to judge velocity if its not showing on the flags which is less than 2mph. If the flags are showing I use it to confirm the direction the flags are flowing or to see if its on a pick-up or let-off cycle.
I only use mirage to judge velocity if its not showing on the flags which is less than 2mph. If the flags are showing I use it to confirm the direction the flags are flowing or to see if its on a pick-up or let-off cycle.
Mirage change is near invisible at those wind speeds. It's best to read the flags.
Read the up wind flags to see what will happen in your line of fire.
Down wind flags are history; ignore them.
Are you going to have a device with you at BSN 2019 that we can test drive?
Absolutely. I'll have it on my phone and a tablet. I was thinking about hanging out during the swap meet to answer questions too and let people play with it.
dmoran
Donovan Moran
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"
Understanding Long Range Bullets Part 2:
Practical Considerations and Decision Making
By Bryan Litz
Understanding Wind Deflection: One way to think about wind deflection is in terms of 'lag time'. Lag time is the difference between the vacuum time of flight3 , and the actual time of flight. For example, say you shoot at a target 1000 yards away with a bullet of initial speed 3000 fps. The vacuum time of flight is 1.00 second (3000 feet at 3000 feet per second). Due to atmospheric drag slowing the bullet down, the actual time of flight may be closer to 1.6 seconds. In this case, the lag time is 0.6 seconds. From here, calculating the wind deflection is easy. Just multiply the lag time by the crosswind speed, being careful of units. Lets say there was a 10 mph (14.66 fps) crosswind for the 1000 yards of bullet flight. 14.66 fps X 0.6 seconds = 8.8 ft, or 105 inches. The hard part in all of this is figuring out the actual lag time. It depends on actual time of flight, which depends on BC. “
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Another basic method is the "Wind Hack"
http://bulletin.accurateshooter.com...-quick-way-to-calculate-crosswind-deflection/
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Where does wind matter (PDF): http://appliedballisticsllc.com/Articles/NVDOC1403-Wind.pdf
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How to make and use a wind plot:
http://bulletin.accurateshooter.com/2017/08/match-shooting-strategies-how-to-use-a-wind-plot/
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Wind Reading Tips from Champion Shooters:
http://bulletin.accurateshooter.com/tag/wind/
Several, scroll through them
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Warren Dean
Team Savage F-TR
@NV Highpower. Ben, David from Oregon here. Bill showed me your app. I just downloaded it and have been goofing around with it. Why does it allow me to drag the bottom dial back and forth? What does that allow me to do? I see that it moves the blue and red lines off the center, but why would I do that? Thanks
Not a high power or F class shooter here but
I'm thinking this is a training device only and not allowed on a course of fire, is this correct?
The question of whether its allowed during course of fire is still being debated. I've had some people argue that its perfectly legal, others say it isn't. It is primarily designed as a training aid to learn how wind affects shots, because as we all know (or at least I think we all know), the relationship between angle and deflection isn't linear from 90 to 0 degrees (i.e. 3 o'clock to 12 o'clock). The question this app tries to answer is, how much does it change and what are the consequences of misinterpreting the angle and velocity. The app allows you to play with these factors in realtime and see the range of corrections you should be working with and the maximum "error" you should expect on the target if you're within those ranges.
So the short answer is - yes, it is a training too that can be used on and off the range.
Should I be worried??????? This is Ben Lucchesi - I'm in Reno, NV and I'll be at SWN next week if you want a demo.Do you have a real name so we can find you?
Hey David!
Great question... the purpose of being able to move the correction scale is if you want to see how adding or subtracting MOA affects the calculated impact. So for example, if the calculated correction came up as 4 L, but you wanted to put 5 L on your gun, where would it move the range of corrections.... Now I REALLY hate to admit this, but somehow I introduced a bug in the code that was causing the elements on the target in the same direction as the scale when they should have been moving in opposite directions, so that when you add wind, the group moves in the direction the wind is added. In any case, its fixed. If you restart the app twice while connected to the internet it will autoupdate itself.
I also added a new feature you'll get at the same time - a hold over point. Its a dot that appears on the target that will show your holdover for the calculated correction. This needs to be used in conjunction with the holdover offset in the upper left corner of the target. This tells you how much you need to have on the gun to work with the hold over. It will increment by 3 MOA so that the hold over dot is always on the target.
Attachments
Warren Dean
Team Savage F-TR
LOL....No worries Ben. I would just feel like an idiot asking around about NVHighpower. I'll find you so I can look at your app. Looks intriquing.
Warren Dean
Team Savage F-TR
That looks like a great training aid and I'm looking forward to seeing it live. That said, I'm pretty sure you won't be able to use it on the line. It would be a good idea to ask Mid Tompkins about its legality when you arrive at the range to avoid any unpleasantness that might arise from using it during firing.
Played around with this stuff, comparing it with Hornady's 4DOF calculator and the TOF calculator was about 95 % correct - the other calculations did not fit so good.
Depart123
The problem with the "Wind Hack", is that you have to already know your drop. The premise being that you can find your wind if your device goes down.
Well if your drop is memorized, why not your wind? If your drop is written down, why not your wind?
It is the answer to a scenario that isn't very likely to exist.
I agree. I'm not interested in any conflicts... That being said, the whole point of the app isn't to use it during matches, its to learn what you need to know before you get to the match. For me, the benefit has been playing with the wind directions to understand the limits of a condition and when its safe to shoot or not. My learning style is mostly visual - there's only so much I can comprehend looking at tables of numbers and charts. The app has been really helpful memorizing my dope for several wind speeds and recognizing "danger zones" when changing from one condition to another.
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