11-17-2019, 05:39 PM | #51 |
Join Date: Aug 2007
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Re: 25mm Payload Rifle [Ultratech]
Variable velocity is liquid propellant which is separate from ETC in UT.
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Fred Brackin |
11-17-2019, 06:41 PM | #52 |
Join Date: Feb 2005
Location: Berkeley, CA
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Re: 25mm Payload Rifle [Ultratech]
Oh right. Yes, that's a distinction that shouldn't exist. ETC is just spark-ignited liquid propellant, and I don't think anyone is seriously considering any other form of liquid propellant gun.
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11-18-2019, 05:05 AM | #53 |
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Join Date: Oct 2007
Location: Indianapolis, IN
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Re: 25mm Payload Rifle [Ultratech]
This seems to be contradictory to the research done so far which includes the ignition and control of combustion of solid propellants.
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Joseph Paul |
11-18-2019, 08:03 AM | #54 | |
Doctor of GURPS Ballistics
Join Date: Sep 2004
Location: Lakeville, MN
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Re: 25mm Payload Rifle [Ultratech]
Quote:
They may be terribly overpowered, but they're not flat-out crazed.
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11-18-2019, 10:08 AM | #55 |
Join Date: Feb 2005
Location: Berkeley, CA
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Re: 25mm Payload Rifle [Ultratech]
Huh...so you're thinking ETK is spark-ignited solid propellant? That's not how it was presented in third edition, though there could have been a deliberate change. In that case, ETK should be a fairly small base improvement that stacks with LP.
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11-18-2019, 10:24 AM | #56 | |
Join Date: Jun 2013
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Re: 25mm Payload Rifle [Ultratech]
Quote:
I've always assumed ETC uses solid propellant, and ETK uses liquid (basically being ETC+LP).
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GURPS Overhaul |
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11-18-2019, 11:14 AM | #57 |
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Join Date: Sep 2004
Location: Southeast NC
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Re: 25mm Payload Rifle [Ultratech]
Since the energy is provided externally, they can use whatever material has suitable thermal properties. I've always assumed it was something like the ablative plastic used in laser-pumped rockets.
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RyanW - Actually one normal sized guy in three tiny trenchcoats. |
11-18-2019, 11:32 AM | #58 |
Join Date: Feb 2016
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Re: 25mm Payload Rifle [Ultratech]
Not possible, the energy required is insufficient for a laser. The idea behind the technology is to use a spark to ignite an exothermic reaction that creates a plasma rather than a gas from a solid propellant. Since the plasma can be directed by an EM field, it allows for more of the energy of the reaction to be used to propel the projectile rather than being wasted by ramming into the barrel (reducing felt recoil and strain on the barrel).
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11-18-2019, 10:32 PM | #59 | |
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Join Date: Oct 2007
Location: Indianapolis, IN
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Re: 25mm Payload Rifle [Ultratech]
Quote:
You had written previously that "Oh right. Yes, that's a distinction that shouldn't exist. ETC is just spark-ignited liquid propellant" Did you mean ETK? My post was entirely about research in to ETC which has been used with both solid and liquid propellants. The UT Designers Notes say that ETK is similar to both LP and ETC weapons and includes variable power shots. But no mention of specific liquid carrying magazines.
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Joseph Paul |
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11-19-2019, 12:12 AM | #60 |
Join Date: Feb 2005
Location: Berkeley, CA
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Re: 25mm Payload Rifle [Ultratech]
I was just thinking about what it was in 3e, actually. In any case, 50% for simple ETC seems quite high.
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