New Air Arms S510 XS Carbine

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tonyc
Posts: 376
Joined: Mon May 29, 2017 10:55 am

Re: New Air Arms S510 XS Carbine

Fri Mar 29, 2019 9:36 pm

You are almost there! Yes, the reg controls pressure and the power adjuster controls flow. The reg also has the effect of regulating flow at a given power adjustment screw setting.

Increasing the pressure acting on the firing valve causes it to close more quickly so less air is released to the transfer port. A fixed mass of air at high pressure will have more energy than the same mass at lower pressure, so there is a trade off between volume and pressure: if the pressure is too high the volume released is insufficient to maintain energy; if the pressure is too low the larger volume released doesn't compensate for lack of pressure in the barrel. This trade off gives the unregulated power curve. For maximum efficiency the reg set point needs to be close to the peak of the unregulated curve. If the reg pressure is lowered you will have a greater total volume of air available before the gun comes off reg but the efficiency will be lower. So dropping the reg pressure a little may give a few more shots but if you drop it too much the lower efficiency becomes the dominant factor and shot count will fall. You may want to play with these at some point but, out of the box, AA should have the firing valve pre-load and reg pressure set fairly close to the optimum.

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TenMetrePeter
Posts: 1043
Joined: Wed Jun 29, 2016 5:40 pm
Location: Luton Beds UK

Re: New Air Arms S510 XS Carbine

Fri Mar 29, 2019 11:28 pm

That’s right.
Problem is if the curve optimum for your rifle is 140 and you set the reg at 140 you will go “off reg” much earlier than if you set the reg at 100 and accept a little inefficiency.
Rifles with 232 or 300 bar cylinders are a much better bet for regulating. Unfortunately not many about.

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