04-13-2012, 01:36 PM | #11 |
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Join Date: Oct 2004
Location: Forest Grove, Beaverton, Oregon
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Re: When to use heavy war arrowhead or light? (Deadly Spring)
Ok, at least that's something. Thanks
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04-13-2012, 02:43 PM | #12 | |
Doctor of GURPS Ballistics
Join Date: Sep 2004
Location: Lakeville, MN
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Re: When to use heavy war arrowhead or light? (Deadly Spring)
Quote:
For any bow in the design system, maximizing the weight of the arrow will maximize the efficiency of the energy transfer to that arrow, since the virtual mass of the bow will be basically constant, and you want the arrow to be as heavy as possible. I built the light/heavy tables because some historical arrows require the use of a light head coupled with a light shaft to match weight. I suspect (but I never really plotted it out) that heavier tends to always be better than lighter just by the math (for a given bow, range is proportional to KE, and increasing mass increases efficiency, which increases KE). But the overall reasons for light/heavy in the arrowheads themselves is to allow a toolkit to match historical arrows. You might also have a case where the arrowhead might be a rate-limiting step, and you want (for example) to put lightweight meteoric iron tips on arrows, but don't have that much of the stuff . . . so you want many lightweight arrows rather than few heavy ones. That sort of thing.
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04-13-2012, 02:48 PM | #13 | |
Doctor of GURPS Ballistics
Join Date: Sep 2004
Location: Lakeville, MN
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Re: When to use heavy war arrowhead or light? (Deadly Spring)
Quote:
Then, you can go heavy/light on the arrowhead. For an individual archer, heavy/light might not matter. If you're procuring a million arrows for a campaign, it might make a difference. I think the equations are biased to "heavier is better," but again, there's going to be a point where it's TOO heavy . . . but that was beyond the already-aggressive sanity-draining reach of the article.
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04-13-2012, 04:41 PM | #14 | |
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Join Date: Oct 2004
Location: Forest Grove, Beaverton, Oregon
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Re: When to use heavy war arrowhead or light? (Deadly Spring)
Quote:
I'm mainly trying to make the perfect bows for SM+1 guys with strengths below 30. As an expert eyeballing it, would the physics bite me with those stats? |
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04-14-2012, 01:08 AM | #15 | |
Join Date: Aug 2004
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Re: When to use heavy war arrowhead or light? (Deadly Spring)
Quote:
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04-14-2012, 02:09 AM | #16 | |
Doctor of GURPS Ballistics
Join Date: Sep 2004
Location: Lakeville, MN
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Re: When to use heavy war arrowhead or light? (Deadly Spring)
Quote:
I put together a bow for you that's 50% bigger than a usual longbow. It's an Osage Orange/Sinew composite recurve, with a draw of 45", it's 105" long, and a 1.7" diameter (reasonable for a 450-lb. bow). It will fire a 50" Ash arrow with a heavy barbed war head about 470 yards, and do 3d (realistic) or 4d+1 (cinematic) damage when it hits. It will lose -1 per die damage per die at 408 yards. This is, as they say, a credible threat. :-) Cost of the bow is $2130 (!), arrows are $25 each (and 3/4" thick!).
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deadly spring, pyramid 3/33 |
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