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Restricting Airflow Into Barrel


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#1 ShadowTank

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Posted 13 September 2007 - 10:28 PM

I am making a a new turret/barrel assembly for what I'm calling the ST-3. I am using the Nerf Rapid Fire 20 as a guide for it. For the RF-20, the opening from the piston to barrel is about .25" in diameter. Because of certain design issues I may need to reduce that opening to .125" in dia, and maybe even .094" in dia. FOr the .125" dia to work, the hole between the piston and the barrel would be off center. So my questions are this.

What issues can I expect by reducing the hole in the first place?

Would it matter if the hole is "off center" or not?

Just as a reminder, Pressure is constant/consistent using CO2 with a Low Pressure Regulator since pressure is a factor.


Thanks!

Shadow Tank
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#2 b00m13

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Posted 13 September 2007 - 11:59 PM

Couldn't this question be posted on your RF20 thread?
Maybe it's just me, but starting a new thread for each individual question seems kind of unnecessary.
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#3 CaptainSlug

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Posted 14 September 2007 - 08:07 AM

Narrower opening restrict the flow rate, but the amount of the restriction depends highly on the length. It's best to not narrow any passages below 5/32" for very long or you will lose performance. Reducing to 1/8" only once should be fine.
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#4 ShadowTank

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Posted 14 September 2007 - 08:51 AM

Thanks Captain!

The opening is only 1/8" in length (the thickness of the "restrictor plate".

Do you think not being in the center of the barrell hole will matter either?

Shadow Tank


Narrower opening restrict the flow rate, but the amount of the restriction depends highly on the length. It's best to not narrow any passages below 5/32" for very long or you will lose performance. Reducing to 1/8" only once should be fine.


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#5 KBarker

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Posted 14 September 2007 - 01:05 PM

Couldn't this question be posted on your RF20 thread?
Maybe it's just me, but starting a new thread for each individual question seems kind of unnecessary.


Totally. This guy has around 5 threads all with various RF20 questions.
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#6 ShadowTank

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Posted 14 September 2007 - 04:02 PM

True, but each thread deals with a specific issue/topic.

I belong to several different discssion groups/forums, and this is how threads on those places are done. I am sorry if things are different here and I have upset the apple cart.

Shadow Tank.

Couldn't this question be posted on your RF20 thread?
Maybe it's just me, but starting a new thread for each individual question seems kind of unnecessary.


Totally. This guy has around 5 threads all with various RF20 questions.


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