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Old 04-22-2014, 02:57 PM   #1741 (permalink)
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I will make up an aluminum one tonight. Lurker I too am using energy total vs velocity graph. I don't think a Nelson will match a regged sniper for velocity curve but maybe total energy out. I do not believe 60 shots at 275, at least if we keep using science and not Canadian magic.

Lurker I was using 675 freak insert. I could probably do better if I had a small bore eigen barrel.
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Old 04-22-2014, 03:06 PM   #1742 (permalink)
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Old 04-22-2014, 03:47 PM   #1743 (permalink)
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Lurker I was using 675 freak insert. I could probably do better if I had a small bore eigen barrel.
I'll probably try to see what I can do on that front, eventually. Freaks are just SO short
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Old 04-22-2014, 04:01 PM   #1744 (permalink)
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I'm starting to make my own barrels and insert system so it's not a huge deal. But I am a barrel whore and like being able to test and compare all available.
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Old 04-22-2014, 04:11 PM   #1745 (permalink)
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Nelson Valve Evolution (Project Leprechaun)
This... I could never find it. Forgot it was you who did it Lurker. Math is never wrong.
Any way of factoring for a variation of valves and barrel lengths?
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Old 04-22-2014, 04:23 PM   #1746 (permalink)
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For some more data points if anyone is interested, I did some extensive testing with a redux and a set of thunder pig springs over here:

VKC Duck #51 tuning thread

I eventually sold that gun off but I was pleased with the results from a pistol with just a short barrel. I think that gun could have been a contender for the record if I started fiddling with hammer weights and power tubes. All those tests were with stock phantom internals.
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Old 04-22-2014, 04:46 PM   #1747 (permalink)
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P0E points out quite rightly that calculation uses an adiabatic assumption, which isn't strictly correct - the more heat transfer into the gun, the higher the efficiency ceiling.
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Old 04-22-2014, 04:49 PM   #1748 (permalink)
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Excellent thread, Manning - we clearly still have some work to do here
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Old 04-23-2014, 12:25 AM   #1749 (permalink)
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So the answer is a heater around the changer and valve eh?
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Old 04-23-2014, 03:08 AM   #1750 (permalink)
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Or an in grip changer with a solid copper frame for maximum heat transfer from your hands.
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