03-09-2014, 02:54 PM | #11 | |
Join Date: Nov 2004
Location: The plutonium rich regions of Washington State
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Re: Gun design: Muzzle energy, bullet caliber, and recoil
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Luke |
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03-09-2014, 03:16 PM | #12 | |
Join Date: Jun 2005
Location: Lawrence, KS
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Re: Gun design: Muzzle energy, bullet caliber, and recoil
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Bullet mass scales as R^2 [R^3] Bullet velocity scales as 1/R [1/R^1.5], assuming constant kinetic energy Bullet momentum scales as R [R^1.5] Gun momentum also scales as R [R^1.5] Gun velocity also scales as R [R^1.5], assuming constant gun mass Gun kinetic energy scales as R^2 [R^3] Or, in other words, if you shoot a big, slow bullet, more of the kinetic energy seems to go into pushing the gun back at you. Bill Stoddard |
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03-09-2014, 03:21 PM | #13 |
Join Date: Feb 2005
Location: Berkeley, CA
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Re: Gun design: Muzzle energy, bullet caliber, and recoil
Arguably these aren't the same thing and should be reflected in different ways in the gun's stats. The amount by which recoil throws a gun's aim off is proportional to (recoil velocity) * (time required to correct for that velocity). Correction time for muscles will be something like (muscle response time + recoil momentum / muscle force). Since ST doesn't reduce the GURPS recoil stat, presumably Rcl is supposed to mostly be a function of response time, and should be based on (recoil momentum)/(gun mass), while the gun's ST score should be dependent on recoil energy.
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03-09-2014, 03:44 PM | #14 | |
Join Date: Nov 2004
Location: The plutonium rich regions of Washington State
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Re: Gun design: Muzzle energy, bullet caliber, and recoil
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Also, lighter bullets mean a flatter trajectory, greater proportional energy loss at a given range, and less penetration. Luke |
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03-09-2014, 04:13 PM | #15 |
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Join Date: Oct 2004
Location: Forest Grove, Beaverton, Oregon
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Re: Gun design: Muzzle energy, bullet caliber, and recoil
Shouldn't acceleration of guns matter just as much, if not more, than overall amount of energy imparted?
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03-09-2014, 04:18 PM | #16 |
Join Date: Jul 2008
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Re: Gun design: Muzzle energy, bullet caliber, and recoil
Seems unlikely. The firing of a single shot occurs in such a short duration that treating it as an instantaneous impulse won't be too far off.
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03-09-2014, 04:33 PM | #17 |
Join Date: Oct 2012
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Re: Gun design: Muzzle energy, bullet caliber, and recoil
Recoil doesn't really matter all that much in a revolver, since the one time my character pulled it out, it was "pull the trigger once each round," then see if the target needed another one. It really matters more as to whether or not it's actually a practical combat weapon. (The navy has decided that revolvers really are the best choice since they don't get a 10% malfunction rate in a vacuum, which is most of the time. If you're going to have a backup gun, you might as well ensure it's actually going to work.)
So, how much should this revolver weigh? 3.1 lb or 3.2 lb? And can I justify recoil 3 - somewhat high, but manageable, and not so high it makes it impractical (see: .44 magnum)? Last edited by BraselC5048; 03-09-2014 at 04:36 PM. |
03-09-2014, 04:43 PM | #18 | ||
Join Date: Jul 2008
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Re: Gun design: Muzzle energy, bullet caliber, and recoil
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Tactical Shooting offers a penalty for shots with flight time over a second, though. (I hadn't previously thought about it but it's at least partially specific to shooting in an open atmosphere.) Quote:
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03-09-2014, 05:56 PM | #19 | ||
Join Date: Oct 2012
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Re: Gun design: Muzzle energy, bullet caliber, and recoil
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In game terms, it really doesn't. The issue is more of an in-universe thing. Nobody would ever use a .44 magnum as a combat service revolver - it's just too powerful, and too impractical. A .357 magnum is about as powerful as you would actually want to use in combat, or as an issue weapon. Go too much more powerful then that, and the extra power isn't worth the tradeoffs. A .357 magnum is considered a viable caliber for police work, and pretty much the most powerful one, while no one considers the .44 magnum to even be worth thinking about. |
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03-09-2014, 06:07 PM | #20 | ||
Join Date: Jul 2008
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Re: Gun design: Muzzle energy, bullet caliber, and recoil
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Boarding any sort of normal vessel, yeah, you wouldn't see bullet travel being a problem for firearms. I wasn't sure, given the vacuum, whether you were going to be doing shooting outside, where ranges can get (arbitrarily) long. Quote:
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accuracy, damage, gun design, muzzle energy, recoil |
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