Here is a list of many barrels, from quietest to loudest 12' from the left side of the barrel
First number is 12' to the left reading second number is 12' infront of the barrel
70.93 -----72.91 PPS
71.59 -----73.44 SLY
71.62 -----75.3 Kaner
72.42 -----74.92 SP Teardrop
72.78 -----82.73 SM-1
72.81 -----76.18 Matchstik
73.12 -----74.86 Trilogy
73.19 -----84.60 Custom Products
73.45 -----79.83 Empire 7pc
73.84 -----75.78 Freak 16"
73.88 -----86.58 Empire Revolver
74.05 -----76.63 Un1Tec
74.33 -----80.73 Scepter
74.31 -----76.10 Freak 14"
74.53 -----81.81 Redz pepperstick
74.84 -----76.36 Phat
74.92 -----89.36 TI Longbow
74.96 -----81.97 Dye Ul
76.06 -----76.71 Hammerhead
77.53 -----75.06 Freak 10"
80.47 -----89.17 Pipe
And just proof that unported barrels ARE louder..
84.38 -----91.68 99 Autococker stock (unported barrel)
Here is a list of the barrels from quietest to loudest at 12' infront of the barrel.
70.93 -----72.91 PPS
71.59 -----73.44 SLY
72.84 -----73.75 Proto Stock
73.12 -----74.86 Trilogy
72.42 -----74.92 SP Teardrop
77.53 -----75.06 Freak 10"
71.62 -----75.30 Kaner
73.13 -----75.42 Xmag stock
73.84 -----75.78 Freak 16"
74.31 -----76.10 Freak 14"
74.84 -----76.36 Phat
74.05 -----76.63 Un1Tec
76.06 -----76.71 Hammerhead
73.45 -----79.83 Empire 7pc
74.33 -----80.73 Scepter
74.53 -----81.81 Redz pepperstick
74.96 -----81.97 Dye Ul
72.78 -----82.73 SM-1
73.19 -----84.60 Custom Products
73.88 -----86.58 Empire Revolver
74.69 -----87.64 JJ Edge
80.47 -----89.17 Pipe
84.38 -----91.68 99 Autococker stock (unported barrel)
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Lets come up with theories on why some are quieter than others.
Here is what I came up with,
MATERIALS
If Im correct, I did fail chemistry..
Palmers Barrel is made out of brass, known to be denser than aluminum, However next in line is the sly, and its carbon fiber known to be less dense than aluminum..
Porting & Length
Usually longer barrels are quieter, my belief is that a longer barrel allows the air that is propelling the ball more volume and we all know that when you take a pressure and give it more volume the pressure drops. Sound = pressure, thats why a silencer works, it drops the pressure thats exiting the firearm from around 1200 or so psi? to 60 psi..
Now how many ports?
How big should the ports be?
Where should the ports begin?
What do you guys think?
Using whatever knowledge you guys have... I know Tom wrote a big article about pressures in the barrel that should really help. Any imput you guys can have would help..