[Preacherman]

For those interested in what makes their guns go BANG!, see here (http://www.aeroballisticsonline.com/ballistics/propellants.html) for an excellent introduction to the subject. It includes gunpowder recipes, etc. for those feeling adventurous! :D

[GunWares]

Interesting link. Who is Donna Cline? And why haven't they outlawed those "mouse tracks" cursors?

[P95Carry]

Quite useful as a ''primer'' for the uninitiated .. but - damn that stoopid mouse trail script ..... it is sooooooooo old now!!

[Car Knocker]

Donna Cline is the Moderator for the Bullet Swaging forum at Graybeard:

www.graybeardoutdoors.com/phpbb2/viewforum.php?f=44

She lists her occupation as: Ballistician, Bulletsmith, and Firearms Cunsultant.

Interests as: Ballistics, reloading, shooting, hunting, mathematics, pysics, and programming.

[rock jock]

Blackpowder produces low pressure, so a larger amount was needed and this larger weight increased the recoil of the firearm by adding it to the weight of the bullet.
Huh?

[only1asterisk]

rock jock


quote:
--------------------------------------------------------------------------------
Blackpowder produces low pressure, so a larger amount was needed and this larger weight increased the recoil of the firearm by adding it to the weight of the bullet.
--------------------------------------------------------------------------------

I think she means that to achieve the same velocity with black powder, you need on the order of 2-3 times as much powder. Throwing more mass out the end of the barrel increases recoil. This is very, very simplistic and she could have worded it better, but she is right.

David

[BluesBear]

Throwing more mass

out the end


of




the





barrel



:confused:?¿?¿?¿?¿?¿?¿?¿?¿?¿?¿?¿?¿?¿?¿?¿?!:confused:

[P95Carry]

Hmmmm ... some rather poor descriptive skills creeping in .... seems she is trying to describe basic Newtonian stuff.

Increase mass of projectile and/or ... give it a harder ''push'' with more powder .... reaction perceived as recoil must go up proportionately.

[only1asterisk]

BluesBear

The powder and resultant propellant gasses have the same mass (for our purposes). Everything that comes out the muzzle (gas, unburned powder , wads, etc) contributes to recoil. Since the escape velocity of the gases is much higher than that of the projectile (in modern rounds) the powder can contribute more to recoil energy than the bullet in many cases . If you compare the big black powder cartridges to smokeless rounds of the same velocity (loaded to optimize the smokeless advantage) you can obtain a difference of up to 80% more recoil with black powder. Even in the same cartridge you can get up to a 30% increase in recoil. This is using the fairly standard escape velocities constants of 2000 and 4000fps for black and smokeless powder respectively. I know these numbers are not right, esp. when dealing with very low pressure smokeless loads. The escape velocity varies somewhat with pressure (lower pressure equals lower escape velocity) and barrel length (longer barrels equal lower escape velocity). I don’t have a simple way to calculate more exact escape velocity for better numbers (you could rig up a strain gauge on a test rig and measure the recoil energy, then calculate the gas velocity for that combination). If I did, it would only increase the advantage of the modern powders.

I should also say that the loading big black powder cases full of very slow burning modern powders for low pressure loads probably would be much closer to black powder in recoil. It is hard to say without the right data.

There is much more to this obviously, but I'm sure there are people that know more and can explain it better than I.

David