Something like that:
![Image](https://i.imgur.com/yZFaJSI.gif)
hectmarr wrote:You have to make many weapons, because this field is long and short life
If the projectile is air tight from chambered to exiting the muzzle it removes the issue from the equation. Any less of a seal could leak the pressure of gasses used to launch the projectile.Xamllew wrote: ↑Tue Mar 03, 2020 4:33 pm@JRRDW, could you explain what you mean by air getting around the projectile and slowing it down? What I had in mind was a barrel diameter that narrows by less than a millimeter, going from decently airtight, to requiring a few tamps with a ramrod to fully seat.
Ah, i see what you mean. My dimensions would ideally allow the projectile to slide down with little effort, but then require a force of maybe 10lbs to seat the projectile into the constricted section at the bottom.jrrdw wrote: ↑Thu Mar 05, 2020 7:03 amIf the projectile is air tight from chambered to exiting the muzzle it removes the issue from the equation. Any less of a seal could leak the pressure of gasses used to launch the projectile.Xamllew wrote: ↑Tue Mar 03, 2020 4:33 pm@JRRDW, could you explain what you mean by air getting around the projectile and slowing it down? What I had in mind was a barrel diameter that narrows by less than a millimeter, going from decently airtight, to requiring a few tamps with a ramrod to fully seat.
CpTn_lAw wrote:"yay, me wanna make big multishot pnoob with 1000 psi foot pump compressor using diamond as main material. Do you think wet bread make good sealant? "
![]()
My understanding is that the turbulence increases the effect. These ports are commonly known as "mouse holes" and introduce what is essentially an angled jet of gas into the path of the main flow, slowing it down further.
Intuitively that seems to be the best explanation.hectmarr wrote: ↑Tue Jun 09, 2020 2:33 pmMy explanation, I do not know if it is correct or not, is that at 6 bar, the butane from the stoichiometric mixture that enters the cold chamber, condenses and therefore fails. When the combustion chamber heats up a little, around 30ºC, it is always in the gas phase. Someone to give me your opinion?
hectmarr wrote:You have to make many weapons, because this field is long and short life
I understand your point of view. When the piston opens at more pressure, it expends more energy but there is more energy available because the combustion chamber has more pressure, and vice versa. However, I think that the energy invested in opening the transfer, when the piston moves, does not recover or a very small percentage recovers. Thanks for your opinion.Moonbogg wrote: ↑Fri Jun 12, 2020 10:22 pmI don't know what the percentage is. I think It depends on the opening pressure of the piston. Since the work is being done with pressurized gas to open the piston, as soon as it opens all of that working gas suddenly goes to work on the projectile and sends it into orbit. So, it may seem as though you are "wasting" work potential to open the piston, but I see it as increasing "work density" where more work can be done in a shorter amount of time with a high-pressure burst. It takes a lot of the gas's energy to move the piston, but since the gas behaves like a spring, all of that energy springs into the projectile once the piston gets the hell out of the way. That's how I see it. Maybe someone more scientific with some actual knowledges can help more.