06-21-2012, 02:31 PM | #31 |
Join Date: Jul 2008
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Re: Spaceships series: Electrical Batteries module?
Based on your last post, the question is more whether any power-related numbers in the whole thing aren't wrong.
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06-21-2012, 02:47 PM | #32 |
Join Date: Feb 2006
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Re: Spaceships series: Electrical Batteries module?
Were any actual per ton values worked out? eg Fuel Cell 5Mw Fusion 10Mw Antimatter 20Mw?
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06-21-2012, 02:55 PM | #33 | |
Join Date: Jul 2008
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Re: Spaceships series: Electrical Batteries module?
Quote:
Physics can give you minimums for how much power a power point must be based on the various power-consuming systems. You can get some maximums too but I think that's a bit hairier.
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06-21-2012, 03:23 PM | #34 |
Join Date: Feb 2005
Location: Berkeley, CA
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Re: Spaceships series: Electrical Batteries module?
Which are somewhat inconsistent. I'm fond of 1 ep = 50 kW/ton, as generates reasonably plausible power densities, but to do that you need to reduce ion drive thrust by a factor of 5 and mass driver by a factor of 10.
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06-21-2012, 03:30 PM | #35 | |
Untagged
Join Date: Oct 2004
Location: Forest Grove, Beaverton, Oregon
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Re: Spaceships series: Electrical Batteries module?
Quote:
I don't expect TPTB to ever clearly state it, but I still like having a ballpark figure for adding new house rule tech. Unless anyone disagrees, I'm going to steal the 50 kW/ton guideline.
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06-21-2012, 03:45 PM | #36 | |
Join Date: Feb 2005
Location: Berkeley, CA
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Re: Spaceships series: Electrical Batteries module?
Quote:
Incidentally, 50 kW/ton is 100 horsepower on a 3,000 lb car; a modern car is likely to have 2 ep, a sports car will be 3-4. |
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06-21-2012, 06:09 PM | #37 |
Join Date: Aug 2007
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Re: Spaceships series: Electrical Batteries module?
That is a rather modest defintion of "sports car". Modern super cars don't really start til you go over 600 hp and there's a very significant number of vehicles in the 400-500 range.
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06-21-2012, 06:29 PM | #38 |
Join Date: Feb 2005
Location: Berkeley, CA
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Re: Spaceships series: Electrical Batteries module?
They're also usually over 3,000 lb loaded weight. For example, a 2010 Camaro SS is 426 hp (318 kW), but it has a curb weight of 3,860 lb, which will exceed 4,000 lb with a driver; thus, that's 3 ep. Going with lighter sports cars, the Lotus Elise SC is 218 HP (163 kW) on a weight of 1,987 lb; that's marginally over 3 ep as well. Can you give me an example of a 600 horsepower car with a curb weight of less than 4,300 lb, or 500 hp at less than 3,555 lb, or 400 hp at less than 2,810 lb? (in all cases, adding 170 lb to curb weight for a driver).
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06-21-2012, 06:55 PM | #39 | |
Doctor of GURPS Ballistics
Join Date: Sep 2004
Location: Lakeville, MN
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Re: Spaceships series: Electrical Batteries module?
Quote:
There's a 1,500hp modification to a Porsche out there with a curb weight of 3,200-3,600lbs. http://ast-usa.com/blog/2011/04/
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06-21-2012, 07:12 PM | #40 |
Join Date: Feb 2005
Location: Berkeley, CA
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Re: Spaceships series: Electrical Batteries module?
I was defending a claim of 3-4 ep for a sports car, not for specialized variants; there's no question more than 4 ep is achievable, it's just not at all normal for sports cars. Its not that exotic in aircraft, a Sikorsky Super Stallion, unloaded, works out to 12 ep.
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