It has been said that the way to define horsepower Vs. Torque is...
HP is how hard you hit the rock wall.
Tq is how deep you go into the rock wall.
The point in the RPM where most engines produce the same numbers in tq and hp... (where the lines cross on the graph) is around 5225 rpm.
With respect to the topic of barrel length...
Cool, they're also wrong. Pressure spikes early in ignition to its peak and then rapidly falls. The bullet moving down the bore increases the volume of the cylinder behind the bullet containing the pressure. This(and the rate of converting powder to gas) means pressure spikes early on and then rapidly falls. Pressure does not "build" in longer barrels.
As stated before, pressure spikes early and then falls. It takes a while for pressure to fall to a low enough differential from the pressure in front of the bullet for acceleration to slow to zero. Longer barrels produce more velocity because this acceleration due to the pressure differential acts on the projectile for a longer duration, even though acceleration is reduced the further down the barrel the projectile goes.
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I know a longer barrel improves accuracy, but is there more to it (as in bullet stabilization) than just the ability of the shooter to deal with barrel length? Some people can shoot a snubbie with accuracy, while most probably cannot. Does the longer barrel, at handgun length, improve accuracy even for those who can shoot a snubbie accurately?
He is.I think he's referring to peak pressure, which happens very early on in internal ballistics. Velocity is a result of a pressure differential accelerating the projectile for a longer duration. Peak pressure isn't higher in a longer barrel.
That unburned powder you mention is one of the reasons I mentioned that longer barrels can have more consistent powder burn(and therfore velocity) in comparison to a shorter barrel.
Since we are nitpicking, rising piston DECREASES chamber volume. Pretty sure that was just a typo, but internal combustion engines are a lot different - and Diesels and gas engines are different from each other. Would have been better just to leave them out as a comparison.The rising piston increases chamber volume faster than combusting air and fuel can increase pressure.
Yup typo. I meant decreasing.Since we are nitpicking, rising piston DECREASES chamber volume. Pretty sure that was just a typo, but internal combustion engines are a lot different - and Diesels and gas engines are different from each other. Would have been better just to leave them out as a comparison.