NP>?
NP>You looked at that calculation?  I was going to try to figure out the
NP>terminal velocity of some bullets to compare against hail, but after a
NP>few hours, decided I didn't want to do it any more.  It's many things,
NP>but it isn't easy if you try to factor in bullet shape and sizes.
It's pretty easy actually:
lead has about 13-14 times the density of hail.  Resistance through air 
is proportionate to the cube of the velocity.  A bullet is going to be 
pulled to the earth with about 13-14 times the force of hail of the same 
size, after acceleration as stopped.  the cube root of 14 is 2.4.  
Terminal velocity will be 2.4 times that of similar sized hail, 
discounting shape irregularities.
Most .22 bullets are about 1.5 to twice as long as they are round, and if 
they manage to stay in perfect vertical alignment, then you might have 
twice the mass for the area, and thus terminal velocity would be the 
cube of 26-28, or about 3 times.  Much less if the bullet tumbles:
A windmilling propeller in a small plane has approximately the same 
resistance in air as a solid sheet of plywood of the same diameter as the 
prop bolted onto the nose of the plane.  A tumbling bullet can be treated 
as one having the same frontal area as the swept area of the tumbling, or 
up to twice the diameter, or 4 times the frontal area.  This would reduce 
the effective density from 26-28 to aound 7 times that of hail of the 
same size, or just less than twice the terminal velocity.
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