Air compression is a valid solution here, if I am understanding what you're asking for. The trick would be developing a silencer for the compression tank simila

Air compression is a valid solution here, if I am understanding what you're asking for. The trick would be developing a silencer for the compression tank similar to that of a firearm. Check this out: http://youtu.be/otYAm6OXnH8 http://youtu.be/otYAm6OXnH8