09-01-2021, 02:24 AM | #1 |
Join Date: Jun 2020
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Guns! Guns! Guns! and GURPS
So, I've been told that Guns! Guns! Guns! would be far better for me to design my weapons than Vehicles, and I've got a question: Are there any tips and tricks on doing this because I've been using Vehicles 2e for so long that I've gone complacent. I also have the old spreadsheet, if you're going to ask that.
This is largely due to one of my settings having pistols that fire 16-gram bullets at 1250m/s (or, about 0.50BMG kinetic energies) at the minimum, and gets more insane from there. So far I've been doing decently but it's slow going due to the fact that my excel skills aren't the sharpest. I've been building Google Sheet workbooks to make the process more automated for entire arsenals: Prototype (so far) of Guns! Guns! Guns!/GURPS hybrid sheet: https://docs.google.com/spreadsheets...it?usp=sharing (please comment) Purely GURPS Sheet: https://docs.google.com/spreadsheets...it?usp=sharing (also, please comment) Also, if someone back-engineered how the guns in the 4e books are designed, I would like to see them. :) |
09-01-2021, 03:21 AM | #2 |
Join Date: Aug 2004
Location: Wellington, NZ
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Re: Guns! Guns! Guns! and GURPS
That's more like 2/3rds of the muzzle energy of a .50 BMG. It's momentum is about half that of a .50 BMG round though, so recoil energy will be 'only' about a quarter if fired from a weapon of identical weight. Of course it's about 2.4 times the momentum of a 7.62x51mm NATO round, and thus about six times the recoil energy. Without, ah..., 'heroic' recoil reduction systems that's not a handgun round.
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Rupert Boleyn "A pessimist is an optimist with a sense of history." |
09-01-2021, 05:35 AM | #3 | |
Join Date: Jun 2020
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Re: Guns! Guns! Guns! and GURPS
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It also doesn't help that the average human in the setting is described as "Halo SPARTAN-IIs and Battletech Elementals having kids and augmented them with Ghost in the Shell-style Cybernetics". Yeah, it's that sort of setting. |
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09-01-2021, 09:03 AM | #4 | |
Join Date: Aug 2007
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Re: Guns! Guns! Guns! and GURPS
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To get 13.5 D out of 9mm you'll need Electrotthermal and a barrel that's 720 mm long so that's not much of a "pistol" even for an SM+1 cyborg. Empty weight is 1215 lbs and Recoil is -4 and MinSt is 43. I'd design another way to get around your armor. GGG might not understand the effectiveness of HEAT warheads.
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Fred Brackin Last edited by Fred Brackin; 09-01-2021 at 09:13 AM. Reason: Yes, I screwed up the math the first time and came back and fixed it |
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09-01-2021, 03:25 PM | #5 | |
Join Date: Jun 2020
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Re: Guns! Guns! Guns! and GURPS
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The thing with V2e is that ETC weapons aren't much improvement to conventional rounds, something that goes against how my setting's weapon development went (to give an example, there were a few decades where anyone who was anyone had to turn their AMRs/HMGs into assault rifles because that's the only way to penetrate the armor in any reasonable time period). That and it gets really bad with EM guns where they take a complete backseat to DEWs (even with the 5x space range rule, EM guns simply suck when compared to DEWs and my setting has spaceship EM guns work as a short-range, cheap (in terms of energy and cost), but very effective backup to DEWs) in general. It should also be noted that the pistol is achieving this with an 18cm barrel (the original markup using V2e rules had a very short barrel, and I reasonably assumed that this meant a barrel caliber of less than 30, so I picked 20)... |
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09-01-2021, 04:08 PM | #6 |
Join Date: Aug 2004
Location: Wellington, NZ
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Re: Guns! Guns! Guns! and GURPS
Ve2 says a 'very short' barrel is 10-19 calibres (sidebar, VE99). That ETC 'only' gives x1.5 damage (sidebar, VE111) is pretty reasonable - that's x2.25 muzzle energy along with a considerable reduction in ammo weight.
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Rupert Boleyn "A pessimist is an optimist with a sense of history." |
09-01-2021, 04:24 PM | #7 | ||
Join Date: Jun 2020
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Re: Guns! Guns! Guns! and GURPS
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Quote:
To give you an idea, conventional propellants can only achieve ~1.7km/s at best. The setting has armor 'catching up' to offense, mind you... |
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09-01-2021, 04:47 PM | #8 |
Join Date: Feb 2005
Location: Berkeley, CA
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Re: Guns! Guns! Guns! and GURPS
Unless you're just dumping massive amounts of energy into the propellant, mostly what ETC lets you do is keep chamber pressure more consistent, which gives you the same maximum out of a shorter barrel.
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09-01-2021, 05:01 PM | #9 |
Join Date: Jun 2020
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Re: Guns! Guns! Guns! and GURPS
From what I understand, ETC is to give you more velocity with consistency as a close second. This is largely -from what I understand- due to the fact that our current propellants have reached their peak in terms of performance (1.7km/s is roughly the top of the rankings in terms of velocity in non-BilPro/ETC guns).
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09-01-2021, 05:07 PM | #10 | |
Join Date: Aug 2004
Location: Wellington, NZ
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Re: Guns! Guns! Guns! and GURPS
Quote:
VE2's ETC rounds with 50% more energy from bullets of less mass would therefore be producing muzzle velocities in excess of 3000 m/s, well within the velocity range you give.
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Rupert Boleyn "A pessimist is an optimist with a sense of history." |
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guns, spreadsheet, weapon design |
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