Have a what I think is a dumb question, but..

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Bigragu

Bigragu

Member
Jul 8, 2018
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CA, United States
I just can’t wrap my silly mind around it. Must have been all the protein shakes over the years...



i do not own a regulator made strictly for tethering a rifle off of a tank, like the Regman(one of these days, you will be mine!)

But in an effort to save air while target practicing or sighting in, I keep my fill whip attached to the gun, but the tank valve is shut off. Like today while sighting in three pcp guns(earlier post) I kept one gun connected and only opened my valve when I know I’m heading down in pressure in relation to my magazine count, and I only removed the fill whip completely when completely done shooting the gun.

My question is, in the remaining air in my five foot hose while connected to the tank but the air not bled out, will it tend to increase the shot count at a steady velocity, or increase the fps(this is where I’m feeling like Spikole), or both?

Help me understand, Mr Hand
 
five foot hose? That is a long whip hose. I would need its diameter to estimate its volume. Assuming its 1/8" ID you're looking at an additional 12~ cc's of volume. Its quite marginal but should yield its percent over the HPA volume in the guns in more shot count. So if you have 200 cc's for example, 12/200 = 6% more shot count, so if you normally get 40 shots without tethered, tethered should provide around 2 more shots. HTH.



-Matt
 
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You are basically adding a very small amount of volume to the air tank. The pressure in the fill line will be the same as what you fill the tank to. You might gain a shot or two but velocity will not change. If you use a probe to fill your gun be careful shooting it with the fill line still attatched. You don't want to accidentlly knock the line loose while under pressure. The line will remain at whatever pressure the gun is at until you bleed the line.
 
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https://www.airhog.com/tank-sets/180-88-cuft-whole-hog-tank-set.html

here is the Airhog tank set, 88 cu foot with legs, bugle strap tubes for the legs, all that. The hose is called a 5’ Spin Din armored micro bore hose. 

So, yeah, I figured it would increase shot count, but not by much. I also figured velocity would not change, but I think I was looking into it too deeply. Thank you for validating.
 
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FPS/velocity change depends on the amount your pushing the rifle, and any flow restrictions between tank/hose connections, and the ratio of hose volume to HPA tank volume. That said, at best even if the tank to hose air flow was equal or greater to port size, the increase in volume would reduce the pressure drop by the same amount, 6% like in my above example, although I don't know your current pressure drop, 6% of what? 10? 20 psi? 500 psi? Lots of variables to consider...but at the end of the day, likely not effecting fps in an unregulated rifle with a good size HPA tank seeing minimal pressure drop per shot..
 
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