Bullets in the rain
Do rain drops make contact with bullets, or are the drops blown out of the path by the turbulence caused by the bullets?
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dano i have seen 22lr bullets hit rain drops though the scope so i know they will hit raindrops as for higher velocity load you could be right i just don't know 0 -
If the bullet is supersonic, it will arrive at the drop before any air disturbance, and get wet. At speeds close to that of sound (transonic), air is compressed ahead of the bullet, and could push water out of the way (depending on many factors). At lower speeds, this effect is reduced until it's negligable, and the bullet gets wet again.
Since I have been studying Greek lately, I'll give a more direct translation of the Thermopylae Monument: "Stranger, tell the Lakedaemonians that in agreement with their customs, we lie here."0 -
Regardless of the round and speed, shooting in the rain effects bullet flight and at the longer ranges, just like wind, mirage, etc. compensation has to be made.
So while I agree with the physics rationale as to wet bullet/dry bullet my view is that it makes no difference if you don't hit what your shootin at[:D]
If you only have time to do two things so-so, or one thing well ... do the one thing!0 -
Great question, and as to some of the responses I can only add, "This may or may not be true."
Rob0 -
dano i guess what i should have said was i have seen little "puffs" from 22lr bullets hitting raindrops through the scope. that makes a little more sense i guess 0 -
WALLEE,
Here is a Shadowgraph that illustrates what a bullet and the air that it's passing through, looks like.
Now imaging that the bullet is spinning at somewhere around 190,000 RPM to 240,000 RPM as well as moving through the air linearly. Here is what the author of this paper has to say by way of a description:
"One may distinguish at least three different shock waves. The first and most intensive one emerges from the bullet's nose and is called the Mach cone. A second shock wave originates from the location of the cannelure, and the third shock wave forms behind the bullet's base. Additionally one can see highly turbulent flow behind the base, which is called the wake.
The flow type at the bullet's surface changes from a laminar boundary layer at the forward region of the bullet, which is characterized by parallel stream lines, into a turbulent flow showing vortexes, beginning at the cannelure."
It is this 'turbulent flow' as well as the spin of the bullet that prevents the water drop from touching the actual bullet surface while remaining supersonic. The 'puff' is the drop being dispersed by the turbulence and spin.
A bullet cannot arrive before a disturbance since it's motion is what is causing the disturbance. With a better 'shadowgraph', you can see the 'Mach Cone' projecting just in front of the bullet nose, which by the way is an FMJ.
I hope that this helps a bit...
Best.0 -
quote:Originally posted by nononsense
WALLEE,
Here is a Shadowgraph that illustrates what a bullet and the air that it's passing through, looks like.
Now imaging that the bullet is spinning at somewhere around 190,000 RPM to 240,000 RPM as well as moving through the air linearly. Here is what the author of this paper has to say by way of a description:
"One may distinguish at least three different shock waves. The first and most intensive one emerges from the bullet's nose and is called the Mach cone. A second shock wave originates from the location of the cannelure, and the third shock wave forms behind the bullet's base. Additionally one can see highly turbulent flow behind the base, which is called the wake.
The flow type at the bullet's surface changes from a laminar boundary layer at the forward region of the bullet, which is characterized by parallel stream lines, into a turbulent flow showing vortexes, beginning at the cannelure."
It is this 'turbulent flow' as well as the spin of the bullet that prevents the water drop from touching the actual bullet surface while remaining supersonic. The 'puff' is the drop being dispersed by the turbulence and spin.
A bullet cannot arrive before a disturbance since it's motion is what is causing the disturbance. With a better 'shadowgraph', you can see the 'Mach Cone' projecting just in front of the bullet nose, which by the way is an FMJ.
I hope that this helps a bit...
Best.
My thoughts exactly[8D][8D][8D]
Love them Pre-64's!!!!-Bob0
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