Talk:Muzzle velocity

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[edit] Powder vs. Velocity

I have got a question. Asume that youhave a barrel that can stand a great pressure. Does twice amount of gun powder give a twice of muzzle velocity.

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No, because the velocity in meters per second is equal to the square root of 2 times the joules of force divided by the mass of the object in kilograms or more specifically, v = (2E/m)^(1/2) where v is the velocity in meters per second, E is the force in joules and m is the mass in kilograms. Shining Arcanine 04:44, 26 January 2007 (UTC)

There is a rule of thumb that you get 1/4th the powder increase as velocity. IE 100% more powder, 25% more velocity. This is simply a handy estimate, and not a law of physics. Arthurrh 00:57, 31 July 2007 (UTC)

[edit] Speed limit of chemical propellants

Could anyone explain why there is such a limit lying around ~2km/s with chemical propellants? As I know for now, if we would have a barrel to withstand a huge pressure, we could launch projectiles, example, with TNT, up to 6-7km/s. So, what's the secret of the limit? —Preceding unsigned comment added by Allgermeine (talk • contribs) 15:13, 3 March 2008 (UTC)

I think the definition of propellent versus explosive depends on speed. So, 2 km/s *may* be the limit of propellents until you get to explosives (and those have different properties/behaviors). --UnneededAplomb (talk) 05:38, 30 April 2008 (UTC)