11-15-2019, 01:32 PM | #31 | |
Hero of Democracy
Join Date: Mar 2012
Location: far from the ocean
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Re: 25mm Payload Rifle [Ultratech]
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I think a man portable grenade launcher that can get 2,000 yards of range on a 25mm grenade is quite doable. I just think it should weigh 6 lbs or more.
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11-15-2019, 01:34 PM | #32 |
Join Date: Apr 2005
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Re: 25mm Payload Rifle [Ultratech]
A loaded AGS-17 also weighs three times as much as the 25mm payload rifle, and almost thirty times that 3.5+ pound weapon system. Probably not a good comparison.
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11-15-2019, 01:52 PM | #33 | |
Join Date: Jul 2008
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Re: 25mm Payload Rifle [Ultratech]
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It is notable, though, that the XM-25's muzzle velocity is actually a bit higher than the AGS-17's. And that might be more the model for the 25mm launcher in UT than the M203 is.
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I don't know any 3e, so there is no chance that I am talking about 3e rules by accident. |
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11-15-2019, 05:08 PM | #34 | |
Join Date: Apr 2005
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Re: 25mm Payload Rifle [Ultratech]
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The ET payload rifle, meanwhile, has a heavier round than the AGS-17, though it's impossible to tell how the actual projectiles correspond to each other. We also know that the payload rifle throws its round 7.5 times the distance, so energy is probably much higher, in a weapon system that weighs a third as much (Sorry, a quarter as much; I was forgetting the weight of the AGS-17's tripod). Neither of these sound like a fun time. (Edit: as a note, the XM-25 has a max range of only 1100 yards, a mere third of the 25mm ET UBGL's 3300) |
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11-15-2019, 05:34 PM | #35 | |
Join Date: Jul 2008
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Re: 25mm Payload Rifle [Ultratech]
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I'm not sure whether the XM-25's range limit is from ballistics or from the fire control of the airburst shells.
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I don't know any 3e, so there is no chance that I am talking about 3e rules by accident. |
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11-15-2019, 06:25 PM | #36 |
Join Date: Feb 2005
Location: Berkeley, CA
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Re: 25mm Payload Rifle [Ultratech]
It uses the same projectiles as the XM307 which has a rated max range of 3,600m, so it certainly won't lose that much velocity in 1,000 meters, and a muzzle velocity of 210m/s gives it a vacuum range of more than 4,000 meters, so I suspect that's just the range at which it's remotely useful.
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11-15-2019, 11:09 PM | #37 |
Join Date: Aug 2004
Location: Wellington, NZ
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Re: 25mm Payload Rifle [Ultratech]
I'm sure it is - the range is very similar.
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Rupert Boleyn "A pessimist is an optimist with a sense of history." |
11-16-2019, 01:01 AM | #38 | |
Join Date: Apr 2005
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Re: 25mm Payload Rifle [Ultratech]
The payload rifle fires up to 3 rounds per second and can rapid-fire 6 rounds per second, all at much higher velocities and presumably energies. Even if it were fired slower, we're still talking about much larger impulses for every shot, in a much lighter weapon that isn't braced by a tripod.
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I think the numbers in UT are just plain too high. |
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11-16-2019, 01:42 AM | #39 |
Join Date: Feb 2005
Location: Berkeley, CA
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Re: 25mm Payload Rifle [Ultratech]
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.
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11-16-2019, 02:19 AM | #40 |
Join Date: Jul 2018
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Re: 25mm Payload Rifle [Ultratech]
Grenade Launcher range it seems will depend on angle (like most artillery.. GLs have some overlap with smaller mortars and even some RPG/Recoilless rifles)
there's coverage for US UBGL here: https://www.inetres.com/gp/military/...nade/M203.html and the M79 https://www.inetres.com/gp/military/...enade/M79.html both cover the mechanics of firing (including pictures) - its a rather nifty reference site for a wide range of US military stuff. I think the 25mm GLs IRL like the XM25 follow similar rules (most IRL GL probably do, even the automatic GLs) |
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