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Old 11-16-2019, 06:00 AM   #41
Rupert
 
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Default Re: 25mm Payload Rifle [Ultratech]

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One of the problems with ETC is that higher velocity shouldn't affect 1/2d range; unless it's dealing with speed regimes where it's drag coefficient changes dramatically, 1/2d should be purely a function of drag coefficient and sectional density. TBH, ETC shouildn't do anything meaningful to a GL, because the reason they aren't higher velocity isn't because of any limitations of propellant, they'd just be uncontrollable, and ETC doesn't help recoil.
Being able to have a smoother pressure curve that stays at the peak longer should allow a slightly higher velocity and a lighter weapon. However, most grenade launchers use a high-low pressure system that gives much of that effect anyway, so the advantage would be small.
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Old 11-16-2019, 06:28 AM   #42
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Default Re: 25mm Payload Rifle [Ultratech]

Come to think of it, since GLs uses plastic cartridges rather than caseless ammunition, they should probably not benefit from ETC.
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Old 11-16-2019, 11:34 AM   #43
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Default Re: 25mm Payload Rifle [Ultratech]

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Being able to have a smoother pressure curve that stays at the peak longer should allow a slightly higher velocity and a lighter weapon.
It would produce a slightly less painful shock, but spreading over a couple milliseconds won't have any effect on controlling the weapon, it's still way under human response time.
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Old 11-16-2019, 07:05 PM   #44
Jack Sawyer
 
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Default Re: 25mm Payload Rifle [Ultratech]

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Come to think of it, since GLs uses plastic cartridges rather than caseless ammunition, they should probably not benefit from ETC.
You might handwave it as using pure electrothermal I suppose.
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Old 11-16-2019, 09:28 PM   #45
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Default Re: 25mm Payload Rifle [Ultratech]

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Come to think of it, since GLs uses plastic cartridges rather than caseless ammunition, they should probably not benefit from ETC.
I don't see why ETC can't be used in cased weapons.
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Old 11-16-2019, 10:24 PM   #46
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Default Re: 25mm Payload Rifle [Ultratech]

Cased ammunition provides part of the seal for the breech of the weapon. You would need to double the price of the weapon to account for the better tooling, though you could halve ammunition weight in that case. In the case of 'stacked' ammunition, you would have issues with detonation though.
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Old 11-17-2019, 08:17 AM   #47
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Default Re: 25mm Payload Rifle [Ultratech]

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Come to think of it, since GLs uses plastic cartridges rather than caseless ammunition, they should probably not benefit from ETC.
The case could be combustible. The shell for the M1A1 tank are semi- combustible leaving only a base plate to be ejected.
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Old 11-17-2019, 11:54 AM   #48
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Default Re: 25mm Payload Rifle [Ultratech]

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Come to think of it, since GLs uses plastic cartridges rather than caseless ammunition, they should probably not benefit from ETC.
Well, like all low velocity rounds, caseless or ETC should not be anything like the half weight UT gives for caseless (50% weight reduction is reasonably accurate for comparison to cased telescoping rifle ammunition, pistols and shotguns are more like 25%, I'm having trouble finding the weight on GL case weight).
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Old 11-17-2019, 12:48 PM   #49
Fred Brackin
 
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Well, like all low velocity rounds, caseless or ETC s.
ETC probbaly should not be applied to low pressure rounds in the first place. Applying ETC to a .45 Long Colt produces a lower powered round than just turning that low pressure .45 Colt into a high pressure .454 Casull. Now applying ETC to a .454 Casull is impressive.
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Old 11-17-2019, 05:14 PM   #50
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Default Re: 25mm Payload Rifle [Ultratech]

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ETC probbaly should not be applied to low pressure rounds in the first place.
Eh, it would actually be pretty useful for variable velocity artillery, there's a reason howitzers have separate powder and projectile, and that is perfectly useful for grenade launchers.
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