Quote:
| Originally Posted by Marmaduke Well... Greg Palmer, after measuring the air flow from the valve on an A-5 has found that anything longer than 12" may actually hamper the performance. However, for any other marker, I don't know. For the A-5, I'll go with Mr. Palmer and stay with his 12" brass. |
Sorry, but I kinda think Mr. Palmer needs to re-evaluate somehting here...
And this is why guys;
We all know how a Tippmann's velocity is adjusted right? It's called an FVA (Front Velocity Adjuster) which is nothing more then a screw the disrupts the flow of air from the valve to the barrel. The more you turn up (or screw out) the FVA the less of a "block" for the air flow this creates, and then just the opposite when you screw the FVA in. Either way, the valve is still using the same amount of air each time with only a screw blocking the successful air flow to regulate the velocity of a Tippmann.
Now with a longer barrel, generally people need to increase the velocity, and I know a lot of others out there don't have an issue with creating enough velocity for longer barrels. The only time most people would see a velocity issue at all from one barrel to another is generally with a Flatline. Some people need a spring kit just to reach the optimum velocity range, while others seem to be alright.
My point here is the only way the air flow efficiency would
really be different is when you put an RVA on the marker due to the fact it increases the drive spring tension, which in turns increases the impact on the valve pin and that in turn creates a longer open-valve duration because of the impact. Now whether Mr. Palmer measured the air flow from just the Valve, and not from an assembled marker I don't know, but it still doesn't make sense when you have it all together and operating when a player with a 18" barrel is still shooting 290fps or more depending on his FVA setting, and the same amount of air being delivered to the valve with each shot.
Either way, with a 5" barrel, or an 18" barrel the A5 and 98s are using the same amount of air with each shot, with a longer barrel you would have less of the FVA blocking the air flow because you would need more velocity (or successful air flow) as you would with a shorter barrel (less velocity, less successful air flow).The path of least resistance kinda applies here.
Of course Mr. Palmer is a great guy for information and all of that, but just with the simple basic operations of a Tippmann it just doesn't make sense when you look at it from the above mentioned perspective/operation.