...Lets imagine it like this, XXXXX> where the x's are the pressure, the > is the pellet.As the pellet starts to be pushed down the barrel, it looks something like OOOXX> where the O are extended pressure waves already moving at the speed of sound, the lingering "XX" expanding also, but acting against the O's which in my mind would still only accelerate at the speed of the physical laws, but since the column behind it already pushing it at speed of sound, it expands much faster than speed of sound relative to the ground, but not relative to the column of air behind it. Addendum, why I feel this is a viable explanation is that the effect of this will drop as the projectile is getting heavier.
Quote from: Tomg on May 16, 2017, 02:48:03 PM...Lets imagine it like this, XXXXX> where the x's are the pressure, the > is the pellet.As the pellet starts to be pushed down the barrel, it looks something like OOOXX> where the O are extended pressure waves already moving at the speed of sound, the lingering "XX" expanding also, but acting against the O's which in my mind would still only accelerate at the speed of the physical laws, but since the column behind it already pushing it at speed of sound, it expands much faster than speed of sound relative to the ground, but not relative to the column of air behind it. Addendum, why I feel this is a viable explanation is that the effect of this will drop as the projectile is getting heavier.ExactleyOOO is the flowXX is the expansion
My approach is to increase hammer strike until the velocity no longer increases.... This plateau is the maximum your gun can produce with the current porting, barrel length and pressure....
...You are correct that if the valve stem is so short that the hammer is stopping near the valve, increasing the hammer energy by increasing the stroke will make it hit the back of the valve, and likely bounce back.... and could even reduce the dwell.... Of course that is a design fault...