10-22-2013, 02:22 AM | #11 |
Join Date: Feb 2005
Location: Berkeley, CA
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Re: [Spaceships] Conventional and EM Gun ranges in atmosphere?
Kinetic energy is proportional to v^2. Drag is proportional to v^2. Loss of energy from drag is equal to (drag force) * (distance). Thus, dE/dd = kE. This is a well known differential equation, and means E ~= e^(kd) (where E is energy, d is distance, and e is the base of the natural logarithm) and half-energy range is ln(2) / k (note: doing this quick by memory, so some signs may be off).
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10-22-2013, 02:39 AM | #12 | |
GURPS FAQ Keeper
Join Date: Mar 2006
Location: Kyïv, Ukraine
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Re: [Spaceships] Conventional and EM Gun ranges in atmosphere?
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What is 'k'? What I was trying to say was that more powerful throws do result in greater range, so if range is proportional to calibre only, something seems missing. |
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10-22-2013, 03:00 AM | #13 |
Join Date: Feb 2006
Location: Not in your time zone:D
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Re: [Spaceships] Conventional and EM Gun ranges in atmosphere?
IDHMBWM
Are all those quoted damage values for the Spaceships versions including the minimum multiplier for their velocity; IIRC *2 for EM and *5 for Grav? And some advice I was given from the forum may apply. A rough estimate, for gaming: • Muzzle Energy x 4 gives • Muzzle Velocity x 2 (mv equates to me^0.5) • Damage x 2.05 (ME^0.52) • 1/2D range x 1.4 (velocity increase ^ 0.5) • Max Range x 2 (mv increase = range increase) Acc +1* (treat this as per Match Grade loads and only add an increase if the original weapon is Acc 4+) Or if I remembered those damage multiples correctly (*2 & *5): EM get +40% 1/2D range, Grav get +120% EM max *2, Grav max *5.
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"Sanity is a bourgeois meme." Exegeek PS sorry I'm a Parthian shootist: shiftwork + out of country = not here when you are:/ It's all in the reflexes |
10-22-2013, 03:11 AM | #14 |
GURPS FAQ Keeper
Join Date: Mar 2006
Location: Kyïv, Ukraine
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Re: [Spaceships] Conventional and EM Gun ranges in atmosphere?
×1 for conventional, ×2 for EM. Didn't look much at grav, as it isn't in my setting.
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10-22-2013, 07:43 AM | #15 |
Join Date: Jan 2010
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Re: [Spaceships] Conventional and EM Gun ranges in atmosphere?
I'm not sure about extremely slow object but for things like various fastball pitches or different pressure loads in guns I believe what you're seeing is just an increased distance traveled before the projectile hits the ground, not the effects of any absolute limit on its range.
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10-22-2013, 09:30 AM | #16 | |
Join Date: Jun 2013
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Re: [Spaceships] Conventional and EM Gun ranges in atmosphere?
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That, or just use Anthony's quick-and-dirty rule. |
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10-22-2013, 10:48 AM | #17 | |
Join Date: Feb 2005
Location: Berkeley, CA
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Re: [Spaceships] Conventional and EM Gun ranges in atmosphere?
Quote:
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Tags |
ballistics, guns, spaceships, weapon batteries, weapon battery |
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