Do you think it will move back to its original path when the wind stops blowing?
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Do you think it will move back to its original path when the wind stops blowing?
Thought about it for ten minutes and have come up with "Nup". My rationale behind the "Nup" conclusion is that there would need to be two changes in direction for that to occur. The first wind influence to put it off course and then some other force/influence to put it back on course. So Nup it is.
naa, not getting involved in this :P
Pretty sure a deviation from the altered path will (unless another force acts on it), mean that the projectile will continue on the new path. It would require another force to straighten the path to parallel with the original path..
So I believe you to be right Rushy
fukit, here goes anyway :P
if you type in 10mph wind from 90 degrees in a ballistics calc like JBM, that means 10mph average, right ?
so 10mph blowing across the entire range the projectile is traveling ?
so if 10mph right wind gives 1 inch left deflection @ 100m (not actual, just for argument sake), some folks are saying that the deflection @ 1000m will be 10 times the 100m deflection i.e. 10 inches...
but if wind causes a deflection because of sideways pressure on the projectile (like the large ship example mentioned), would the effect not be compounded as opposed to linear ? test it for yourself, to me it looks more linear than compound, so maybe something else is going on ?
i think the danger is looking at a projectile as if it is a large polystyrene ball, and thinking that the force vectors involved with wind have a similar effect as those of forward velocity and rotational stabilization. now think of a modern hpbt design projectile, with very high forward velocity, high degree of stability due to rotation, and how those forces are working against any deflection due to wind...
something else to ponder... if you take a "yacht" shape, and put a dowel or mast thru it from top to bottom, exactly in the center. now imagine it pivots on that dowel. put the shape in a stream of flowing water. will the pointy bit (bow) turn upstream or downstream ?
The direction it's heading hasn't changed
There has only been a force applied to the side of it
The same force on that bullet will have greater effect on the bullet beyond 100 yards as the bullet slows
This is mostly due to the extra time the wind force has to act on the bullet as it slows
I still don't think its right, I may not be understanding it properly. But if its pretty much saying every 100m it moves an inch? I see that as wrong the bullet isn't moving as fast from 200m to 300m like it was from 0-100m
Toby, limit your shooting to 30 metres and it won't matter much. Ha ha ha ha
Here is one link http://www.6mmbr.com/winddrift.html
Ok DAF, so what do you see happening in the following examples:
a) 10mph right wind between 0 and 500. deflections at 100 and 500 ?
b) 10mph right wind between 0 and 100, no wind between 100 and 500. deflections at 100 and 500 ?
c) 10 mph right wind between 0 and 100, no wind between 100 and 400, 10 mph left wind between 400 and 500. deflections at 100 and 500 ?
Here is an interesting article about Naval Guns FIRE CONTROL FUNDAMENTALS - Part C
think of a pool table... if the white ball has force applied causing it to deviate from its intended path, what happens when that force stops..
whether the force is short (impact of another ball) or of longer duration (wind on a projectile) the result is the same..
No ... no Gillie, don't respond.... don't get dragged in... yes, there is some dodgy logic being applied but if you get dragged in you'll try to explain it... :wtfsmilie: step away from the key board now... ok, now... just stop reading... now... :ORLY:
EBF got dragged in, even DAF replied... don't do it!!!!
Dammit i am meant to be working.... :ORLY:
Come on Gillie, wade in, it's FRIDAY :D
Short answer: The wind changes the direction the projectile is travelling in. It is an angular defection not one parallel to the original projectile path.
Can’t remember if the projectile slows faster or slower over time. I suspect the projectile slows down slower over time. Yes, the slower the projectile the more the wind will affect its path.
Damn you… I should never have responded. :P
Yes. :thumbsup:
This is wrong unless the 10mph wind is only acting between 0m and 100m. :wtfsmilie:
While wind is still acting it is compounded. Just about nothing in life is linear. :oh noes:
You lost me with this but I will offer one little bit of insight – ballistic coefficient. :ORLY:
Don’t change the subject :P
So sticking to the 1” deflection at 100 for a 10mph wind – the deflection is 1” at 100. The deflection at 500 will be more than 15”.
So sticking to the 1” deflection at 100 for a 10mph wind – the deflection is 1” at 100. The deflection at 500 will be 5”.
So sticking to the 1” deflection at 100 for a 10mph wind – the deflection is 1” at 100. The deflection at 500 will be a little less than 4”.
Ouch – no comment :thumbsup:
I repeat: damn you all for dragging me into this :thumbsup:
Got it. The angle of the dangle changes proportianate to the slope on the rope and the pitch in the ditch.
LMAO Gillie, it's a drag a tell ya :D
My yacht example example if very close to your BC insight...
We having prize giving at the rifle club tomorrow, will pose some of these theories to two current 300m NZ team members, and report back if the evening does not get too raucous ;)
This article covers it well A Scientific Basis For Evaluating Variable Crosswinds The idea is what is the difference in a 10 mph wind from 0 -500 yds at 1000 yds vs a 10mph from 500 - 1000yds at 1000 yds. Basic answer is the 0-500 10 mph causes twice as much drift as the 500 -1000 yd wind.
ebf, i think your yacht example has something to do forcing a natural stability onto a shape/mass by forcing it to pivot round a point not it's natural center of mass. I am certainly not a ballistics expert though. Read Bryan Litz's books... well i think they should help i haven't actually read them myself :)
more time hunting less time reading google wikipidia an fuckn books.you guys sound like geeks..............sound impressive but still geeks:thumbsup:.........seriously though go for hunt and shoot a deer at 100yds and forget about the fuckn wind.
Buy a 338 DCM and just hold a little to the left or little to the right without actually holding off the target and your good to go👍
Sam Wallace :D
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