04-28-2018, 06:37 AM | #21 | |
Join Date: Aug 2004
Location: Austin, TX
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Re: [Spaceships] Paying more for better system?
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Alternately, it could just be a plot device that doesn't obey the standard rules.
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04-28-2018, 07:58 AM | #22 | |
Join Date: Jun 2013
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Re: [Spaceships] Paying more for better system?
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04-28-2018, 11:24 AM | #23 | |
Join Date: Aug 2004
Location: Binghamton, NY, USA. Near the river Styx in the 5th Circle.
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Re: [Spaceships] Paying more for better system?
So I've been going through these suggestions with more care and have a couple comments.
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I'm not a rocket scientist, but it seems that a 20% and 40% boost in delta-v is unrealistically huge. I'm having a hard time finding any accurate numbers for realistic rockets over the years, but my gut just tells me that it's not right. Most rockets using the same fuel have Isp within 10% of one another, and delta-V is just Isp multiplied by the Ln of (full mass / empty mass); most increases in delta-V come from reducing empty mass of the entire rocket by tiny fractions, and those mass savings can come from anywhere from computers to better structural materials for the fuel tanks.
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04-28-2018, 12:19 PM | #24 | |
Join Date: Aug 2007
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Re: [Spaceships] Paying more for better system?
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Rocket engines are more likely to vary by power-to-weight ratio. For example the "Merlin" engine used in the Falcon-9 by Space-X gives out 150 lbs of thrust per lb of engine. The standard number used in Ve-2 was 100 lbs per lb. This might be where the weight savings that allow for the landding gear come from.
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04-28-2018, 12:20 PM | #25 | |
Join Date: Oct 2008
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Re: [Spaceships] Paying more for better system?
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For Rocket engines, yes there would likely not be (at least not much) d-v increase, but you may see the engine create more thrust for the same mass engine, allowing you to mount less engines and get the same acceleration. But for things like Fission or Fusion engines you would likely be able to gain more d-v by better designed engine. In fact some of them do gain more d-v by TL as it is and as I see it the others not gaining such is likely a simplification as realistically a higher TL engine should be able to produce and transfer more energy to the reaction mass increasing it's speed and thus ISP. |
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04-28-2018, 12:35 PM | #26 | ||
Join Date: Aug 2004
Location: Austin, TX
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Re: [Spaceships] Paying more for better system?
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I can believe that HEDM technology could have similar variations just between metallic hydrogen and metastable helium, and the various nuclear engines could have ISP variations based on the energy of the reaction you're eventual using. Nuclear light bulbs, for instance, seem like they would have space for a higher ISP design that heats the exhaust to even higher amounts but then require exotic materials for the nozzles and such. On top of that, a 20% or 40% improvement is not that much compared to the TL advances, which are usually 3x or more. If a TL 10 Fusion Rocket has a delta-V of 60 mps per tank, I'm okay with the best TL 9 Fusion Rocket having a delta-V of 17 mps per tank.
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04-28-2018, 12:51 PM | #27 | |
GURPS FAQ Keeper
Join Date: Mar 2006
Location: Kyïv, Ukraine
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Re: [Spaceships] Paying more for better system?
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04-28-2018, 05:13 PM | #28 |
Join Date: Aug 2004
Location: Austin, TX
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Re: [Spaceships] Paying more for better system?
I missed that, but it illustrates my point: the Fine (Sensitive) array is flat out better than the Fine (Powerful) within 2 LS, and usually worse at longer ranges. At 10 LS, the Sensitive array is at -5 but the Powerful array only at -4. Which option you want depends on how you expect to use the array but either option is a lot of money for a little advantage.
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04-28-2018, 08:45 PM | #29 | |||
Join Date: Jan 2015
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Re: [Spaceships] Paying more for better system?
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FFR-41 Mave "Yukikaze" Code:
Front Hull 1-2 Advanced Metallic Laminate [400K] 3 Medium Battery† [600K] 4-5 Fuel Tank [60k] 6 Defensive ECM [1M] core Multipurpose Arrays (Sensitive) [10M] comm/sensor 7 Central Hull 1-2 Advanced Metallic Laminate (200K) 3-5 Fuel Tank (90K) 6 Defensive ECM (1M) core Control Room (Genius;High Capacity) (25.02M) C7; comm/sensor 4; two stations Rear Hull 1-2 Advanced Metallic Laminate (400K) 3 Fuel Tank (60K) 4 Defensive ECM (1M) 5-6 Jet Engine (2M) +Winged (500K) +Stealth Hull (500K) † 1x Fixed Conventional Gun; 2x Turret Missile Launcher Quote:
Also, is it possible to have an engine that occupies two slots and say it's a single thing (like Spinal Battery)? It's mostly fluff so it seems probably but by the rules one of the engines could be disabled/destroyed while the other is operational, which would make it strange. Maybe it's "half-destroyed" as in badly damaged: burning, smoking but still somehow operational? Non-Volitional AI "Yukikaze" TL9 C7 Base Cost: $10K Advantage: Soul of the Machine 4 [20] (Based on this advantage from Pyramid, gives bonus to Piloting, Electronic Operation, Gunner, Artillery and Navigation) Skills: Piloting (High-Performance Airplane) DX+6 [8]; Artillery (Guided Missile) IQ+5 [4]; Artillery (Cannon) IQ+4 [2]; Gunner (Cannon) DX+4 [1]; Navigation (Air) IQ+4 [2]; Electronic Operation (EW) IQ+5 [4]; Electronic Operation (Sensors) IQ+5 [4] Total CP: 45 (+225$) Final Cost: $32.5K While making up the AI I encountered two problems: Can AIs learn DX based skills like Piloting and Gunner? I think there should be one but I couldn't find an upper limit of how many points can an AI have, did I miss it or it really doesn't exist as RAW? Last edited by Sorenant; 04-28-2018 at 08:53 PM. |
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04-28-2018, 10:43 PM | #30 |
Join Date: Jan 2015
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Re: [Spaceships] Paying more for better system?
Not really related to the question at hand but for the sake of it, here's also the other prominent ship from Sentou Yousei Yukikaze:
Nuclear Aeriel Aircraft Carrier "Banshee" Code:
Front 1 Light Alloy (5M) 2 Secondary Battery* (60M) 3-4 Hangar Bay (2M) 5 Enhanced Array (20M) coomm/sensor 10 6 Habitat (40 Bunkrooms, 10 Cabins, 10 Briefing Rooms) (10M) core Defensive ECM (100M) Central 1 Light Alloy (5M) 2 Secondary Battery* (60M) 3-4 Hangar Bay (2M) 5-6 Habitat (10 Cabins, 10 Luxury Cabins, 20 Sick-bays, 10 Offices) (20M) core Control Room (20M) C7 comm/sensor 8 10 stations Rear 1 Light Alloy (5M) 2 Secondary Battery* (60M) 3-4 Cargo Hold (-) 5-6 Nuclear Thermal Rocket, Ram-Rockets (250M) Winged +50M TL 9 dST/HP 150 Hnd/SR 2/6 HT 13 Move 10/1,250 LWt 10,000 Load 2,222 SM +10 Occ 220ASV dDR 10 Cost $619M |
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