02-14-2017, 11:43 AM | #41 |
Join Date: Mar 2013
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Re: Gurps Vehicles / 4th. Edition
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02-14-2017, 12:54 PM | #42 |
Join Date: Jun 2013
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Re: Gurps Vehicles / 4th. Edition
I changed a value based on set barrel lengths to one that allowed for a range (but still scales the same way), and a value based on set calibers to one that allowed for a range (but still scales the same way). I also moved some numbers around to make things be in Imperial rather than metric units, as GURPS uses the former more than the latter. It's just higher resolution, not an outright rewrite. I'll admit Range and Acc use completely new methods, however. All that said, just using Vehicles as-is will still get you pretty close to the correct values, maybe using Acc/2 for smallarms and Acc/3 for larger weapons. Sure, damage, range and weight are going to be a bit off, but they'll still be in the right ballpark.
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02-15-2017, 10:57 AM | #43 |
Join Date: Jul 2013
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Re: Gurps Vehicles / 4th. Edition
Extremely interesting, and I'd be very interesting in the rest of your thoughts. I especially like the barrel length change.
One comment, though: Power and barrel length do indeed have an influence on the range (less power means less muzzle velocity, less barrel length means less efficient combustion). I've tested it with 1/2d range = 12.5 * calibre ^ 0.5 * barrel_length ^ 0.75 * power * T where T is the TL factor, calibre is in mm (not in inches!), and barrel length in multiples of calibre. range = 1/2d ^0.5 * 120 + 1/2d indirect_range = 2.5*range are as in Vehicles. From what I've tested, the numbers fit extremely well to a number of WWI and WWII artillery. |
02-15-2017, 11:14 AM | #44 | |
Join Date: Jun 2013
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Re: Gurps Vehicles / 4th. Edition
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That said, if you have an equation that ends up giving you good agreement with historical results, use that. In fact, I may end up stealing that equation for my own use. I'm assuming the T variable uses the same values as in Vehicles, correct? |
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02-15-2017, 01:52 PM | #45 |
Join Date: Nov 2008
Location: Yukon, OK
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Re: Gurps Vehicles / 4th. Edition
The medium has an influience here as subsonic bullets travel farther in water and with more power than supersonic. At least according to a Myth Busters test.
__________________
My GURPS publications GURPS Powers: Totem and Nature Spirits; GURPS Template Toolkit 4: Spirits; Pyramid articles. Buying them lets us know you want more! My GURPS fan contribution and blog: REFPLace GURPS Landing Page My List of GURPS You Tube videos (plus a few other useful items) My GURPS Wiki entries |
02-15-2017, 02:07 PM | #46 | |
Join Date: Jun 2013
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Re: Gurps Vehicles / 4th. Edition
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I didn't think to specify that I was assuming Earth atmosphere at 1 atm pressure and typical Earth temperatures, but deviating too much in one of those directions is of course going to change things (it should go without saying that a bullet loses 1/2 its damage at a much more rapid rate when going through steel or flesh than air, for example). |
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02-15-2017, 02:13 PM | #47 | |
Join Date: Nov 2008
Location: Yukon, OK
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Re: Gurps Vehicles / 4th. Edition
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__________________
My GURPS publications GURPS Powers: Totem and Nature Spirits; GURPS Template Toolkit 4: Spirits; Pyramid articles. Buying them lets us know you want more! My GURPS fan contribution and blog: REFPLace GURPS Landing Page My List of GURPS You Tube videos (plus a few other useful items) My GURPS Wiki entries |
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02-16-2017, 10:55 AM | #48 | |||
Join Date: Jul 2013
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Re: Gurps Vehicles / 4th. Edition
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That being said, the indirect firing range using the old formula still seems to work well, so I'm using your formula for 1/2d range, and the old one for max and indirect fire range. Quote:
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02-19-2017, 04:25 PM | #49 |
Join Date: Apr 2011
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Re: Gurps Vehicles / 4th. Edition
Very true. I was working from the perspective of a situation where you wanted to create and use a construction system. If you're modeling existing ships and have their capabilities mapped out in GURPS terms, then yeah you just go ahead and use those.
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02-23-2017, 12:02 PM | #50 |
Join Date: Mar 2013
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Re: Gurps Vehicles / 4th. Edition
After skimming through Pyramid 3/34 and Spaceships 7 I found a lot of interesting stuff in there.
Last edited by Thomson; 02-23-2017 at 12:08 PM. |
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