Advanced Marksmanship wind effect

[chadg]

Im sure this has been covered before but my search skills are lacking.Ok honestly everything that came up im just to lazy to go through it all.
My question is how does wind effect bullet flight coming from 6 oclock and 12 oclock.

 

[TOP PREDATOR]

Re: wind effect

one blows at in the afternoon, and one blows at you in the morning

they say none, but the bullet is arching, (up and down) just like a golf ball. i have found (but cant prove) that just like a golf ball if the wind is in your face, at longer ranges, it seems i have to adjust for ELEVATION UP, just like you'd have to take a club higher on the course.

at your back ELEVATION DOWN as the wind is pushing the bullet toward the target

 

[Lindy]

Re: wind effect

The effect of shooting into a headwind is to lower the point of impact. The effect of shooting in a tailwind is to raise the point of impact.

A headwind raises the amount of aerodynamic drag by effectively increasing the air density, and a tailwind lowers it. If you don't believe that, go ride a bicycle into a stiff headwind.

 

[chadg]

Re: wind effect

Thanks fellas.

 

[9H_Cracka]

Re: wind effect

So air that is moving, regardless of direction, increases its density Lindy? Hence the reason it effects the flight path of the bullet? Because of density? Air is less dense when still?

 

[Lindy]

Re: wind effect

What I said was, "A headwind raises the amount of aerodynamic drag by <span style="font-style: italic">effectively</span> increasing the air density..."

The <span style="font-style: italic">actual</span> density of the air is a function only of temperature, pressure, and humidity.

But if you think it's not harder to move into a headwind, please perform the experiment with a bicycle noted above. And that's as true for a bullet as it is a guy on a bike.

 

[Lindy]

Re: wind effect

P.S. - see the Drag Equation and note that drag is proportional to the square of the velocity of the object <span style="font-style: italic">relative to the fluid</span>. The fluid in this case is the air.

A headwind increases the velocity of the object relative to the fluid, increasing the drag, and a tailwind decreases that velocity, thus decreasing the drag.

 

[9H_Cracka]

Re: wind effect

Thanks - I posted that then left for the range. Got to thinking about it, and it is one of those work = distance over time altered by other forces when not in a vacuum issues. The bullet "experiences" more atmosphere during its time of flight when going into a head wind and less atmosphere when the wind is behind it.

It is intuitive that it will hit higher in a tail wind and lower in a head wind, but explaining WHY is a different matter.