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Hard Air Magazine - Technical Editor
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Author:  rsterne [ Thu May 28, 2020 10:48 am ]
Post subject:  Re: Hard Air Magazine - Technical Editor

Article #24 is now online at Hard Air Magazine....

https://hardairmagazine.com/ham-columns ... o-pellets/

It's hard to believe this marks 2 years as Technical Editor.... but I have to admit I am running out of topics!!!!

Bob

Author:  Daryl [ Thu May 28, 2020 2:07 pm ]
Post subject:  Re: Hard Air Magazine - Technical Editor

2 years - I thought maybe 1 :lol: - time flies when you are having too much fun.

Author:  rsterne [ Mon Jun 22, 2020 4:01 pm ]
Post subject:  Re: Hard Air Magazine - Technical Editor

The last article in my series on Ballistics is now online....

https://hardairmagazine.com/ham-columns ... ug-design/

This is the 25th article I have written for H.A.M. and I am going to take a break from having to meet a deadline every month for a while.... When I have an idea for a stand-alone topic, or a short series, I plan to send them to Stephen, it just won't be monthly any more....

Bob

Author:  rsterne [ Wed Jul 01, 2020 5:18 pm ]
Post subject:  Re: Hard Air Magazine - Technical Editor

Here is an Index on Hard Air Magazine to all my articles:

https://hardairmagazine.com/ham-columns ... -articles/

Bob

Author:  Edmonton<500 [ Wed Jul 01, 2020 5:49 pm ]
Post subject:  Re: Hard Air Magazine - Technical Editor

Congrats on a great run, Bob. :drinkers:

Author:  rsterne [ Mon Feb 15, 2021 6:37 pm ]
Post subject:  Re: Hard Air Magazine - Technical Editor

There is a new article on H.A.M.... It deals with work by Miles Morris on possible drag models for typical airgun slugs....

https://hardairmagazine.com/ham-columns ... es-morris/

It is theoretical in nature, but provides some insight into the anomalous results we are seeing compared to the commonly used G1 drag model....

Bob

Author:  Daryl [ Tue Feb 16, 2021 5:12 pm ]
Post subject:  Re: Hard Air Magazine - Technical Editor

Tks Bob. It is amazing how little drag there is until you get up into transonic speeds.
We see this with large bore rifle bullet velocity loss once they go sub sonic. Amazing indeed.
Of course, we are using much higher BC bullets as well. The charts shows almost hitting a wall
at SOS speeds.

Author:  rsterne [ Wed Feb 17, 2021 11:48 am ]
Post subject:  Re: Hard Air Magazine - Technical Editor

Yes, and it makes total sense for a bullet with a flat nose.... they simply aren't designed to minimize shock wave formation.... Once the Meplat is over 50% of the caliber, the overall drag increases quite rapidly, which is something the "McDrag" program I was using didn't show.... Interestingly, all the shapes show quite a similar increase approaching Mach 1.... pretty much a "don't go there" hill to climb.... However, that rapid increase doesn't occur until Mach 0.9, which is just over 1000 fps.... so it does mean we can play with slightly higher velocities than we thought....

Of course all this is at the moment theory.... but it does give us some insight into limited observations regarding what appears to be lower than expected drag with slugs in that 900-1000 fps area that we are seeing.... 8)

Bob

Author:  Daryl [ Wed Feb 17, 2021 4:40 pm ]
Post subject:  Re: Hard Air Magazine - Technical Editor

Appears that the higher vel. rifles that run bullet shapes into the low supersonic range, would lose most of that in the first 50yards or so and for range shooting around 100 to 150yards,
the slightly slower bullets, say 900fps to 950fps range would not be far behind. Of course, what shoots well, if the most important.
shooter 1721 u-tuber did some long range testing from an FX with the FX Hybrids. The long range ballistics and remaining velocities & penetration/performance in ballistic gelatin and in
modeling clay in an earlier video were quite impressive, right to 300yards.

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