If I bore the butt of rifle barrel to twice its original caliber, and insert 2:1 piston?

Question

will the piston push the bullet with quadruple force and quadruple muzzle velocity?

Mick:

I cannot delete you from my list,
because I do not have one.

_You need to remove _me from
your contact list to stop this flood
of garbage.

(Sorry for inconenience, but do not
blame me, blame Y!A developers.)

Answer 1

you are putting your self in danger you are not suppose to fool around with modificatoins on guns

Answer 2

If you have a piston blocking the exit of the exhaust gases from the barrel, you will simply blow up the gun. What are you imagining is in-between the large piston and small piston? If it's a gas, the gun's performance will be very poor (not to mention the fact that it will blow up due to no escape hole for the exhaust gases).

It is a fundamental fact of fluid dynamics that a bullet cannot exceed the speed of sound in the hot gases inside the gun barrel. The speed of sound in a gas scales as the square root of temperature, so the hot gases have a higher speed of sound than the outside air. However, even if the gases reach a temperature of 3000 Kelvin, the speed of sound in those gases will only be 3.19 times as fast as the speed of sound in normal temperature air (295 Kelvin), or about 2400 miles per hour. No matter what the shape of the gun barrel, the bullet will never go faster than the speed dictated by this temperature.

The reason for this is that any pressure impulse in the hot gases will propagate at the speed of sound. If the bullet is going as fast as the speed of sound, the pressure impulse will never reach the bullet, so the bullet will never be accelerated further.

In reality, friction causes the bullet to have a muzzle velocity that's less than the speed of sound in the hot gases.

Answer 3

get some ballistics gell...
shoot it w/out the mod and see how far it goes in
shoot it w/ the mod and (with four times the velocity) it should go 16 times further

Answer 4

Alexander,

Please delete me from your distribution list. Your incessant questions are a nuisance. Few approach anything of interest, while even fewer are challenging.


Regards,

Mick