Shot some groups with my Airwolf today
Today was nice and crisp and my neighbours are away, so I thought that I’d shoot a few groups and see how the Airgun Gods favoured me. Apparently they like me quite a lot as I managed quite a few good groups, with the below being the best:
Sorry about the quality of the picture, but my wife has taken the Camera, lol.
Anyway, that’s 7 shots and a Quarter Coin at about 26 Yards, so not too bad, I think. Airgun was an Airwolf in .22 with a PAG shroud and JSB Exacts. Why 7 shots? Well, I was going to do 5 and they all went into virtually the same hole, so I added another and that pushed it out a fraction, so I fired off another, again making the hole slightly larger. At this point I wimped out and decided to be content with what I had.
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Washensi, you got it right in the previous post.
Problem is not the poppet valve bounching with every pump stroke. The valve is designed to withstand thousands of violent hits by the hammer in comparison to the gentle lift by air from pumping. Besides, using a compressor can eliminate the pressure pulses by having a small accumulator.
Moisture (from the air) hence rusting/corrosion of metal parts is the perceived problem. Moisture in vapour phase is not the issue but when you compress air, moisture will condense i.e. forming liquid water. Most commercial compressors have dryers to remove that water and only dry air gets into the scuba tanks.
We use a lot of compressed air as motive force in industry. Imagine all the instruments and control valves etc. freezing up in winter time if there is water in the air lines. Freezing point for industrial dried compressed air is usually below – 50F.
When you use a handpump during those high humidity seasons, droplets will form. The Hill pump has a dryer pack which, unfortunately, is on the wrong side of the pump – the low pressure side. It would not be as effective as on the high pressure side but it’s better than not having any drying capability. The same applies to simple compressors without drying facility e.g. tire pumps at gas stations. Just try pressing on the valve stem gently and feel the droplets come out.
A lot of people don’t have easy access to dive shops and hand pumps may be their only option. If you have air conditioning at home, the air is usually dry enough. Where I live, we have to use humidifier during the winters anyway.