Reply To: Help me understand barrel length / Velocity

Forums PCP Airguns Help me understand barrel length / Velocity Reply To: Help me understand barrel length / Velocity

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Arzrover
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The port size, available air(plenum or reservoir size), valve dwell time and barrel length all affect velocity. A short dwell time and/or port size won't usually realize higher velocities (to any great degree) with a longer barrel. All this is part of the tune or design process. It is similar to loading a cartridge with different rate powders to optimize velocity in a particular barrel. One rifle I am working on uses quite a bit of air for each shot and manifests that with LOUDNESS and an aftershot push. I need less dwell time and a larger port plus lower reg pressure to keep the velocity where I want it but use less air, it seems.

Hope this helps some,

Bob