Comments on: Wayne van Zwoll: Why Bullet Trajectory Doesn’t Go Straight

By: bangorbillc

bangorbillc — Sun, 08 Apr 2012 18:27:46 +0000

Wayne,
It would seem to me that a temperature rise would result in a change to the bullet/barrel interference fit due to increased bullet diameter and reduced barrel bore size. A rise of 25 degrees would cause a combined change of about 1.5 ten-thousandths which would have to increase chamber pressure, probably more than the warmed powder theory.
bangorbillc

By: guygeorges

guygeorges — Fri, 06 Apr 2012 22:38:27 +0000

Hi,
If I remember my psysics 101 correctly, (witch would be surprising after 50 years !)
distance fallen is :
:d= 1/2 of g times t square
for one fourth of a second it is around a foot of drop
not three feet as you state in the beginning of your article
see :
http://www.gravitycalc.com/

By: mynickelsworth

mynickelsworth — Thu, 05 Apr 2012 23:56:22 +0000

I studied math so I know the calculation of the bullet based upon speed and gravity. I have never seen any mathematical description of the effects of air resistance and altitude nor temperature. Are there any such formulas that are simple enough for bachelor degree math guy to understand?
Straight velocity and gravity says my 9mm handgun drops about 6 inches in 100 yards without windage, temp. or alt.

By: brownealtman@comcast.net

brownealtman@comcast.net — Thu, 05 Apr 2012 22:10:54 +0000

Concerning the effect of wind resistance, the situation is actually worse than stated. Every time the wind speed doubles, the wind resistance is squared.