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Post by HeinzPepperoni on Apr 29, 2017 11:09:49 GMT
Hello all, I've thought of a build challenge competition that can hopefully draw your interest: Building the space equivalent of a modern Hunter-Killer submarine.
First of all, you may ask yourself what do I mean with the term "space submarine"? The definition I'll provide you is the following: "A vessel with a low heat signature, armed only with missiles, capable of interdicting deep within enemy shipping lanes". I know CoaDE doesn't simulate any strategic layer and also we will have to role-play a bit and pretend you can be stealthy with a really low heat signature. The full requirements are the following:
-Having the lowest heat signature possible (For reference, compare it to stock designs such as the Gunskiff and the Orbital Defense Craft). -Be at least 85 meters long. -Be equipped ONLY with conventional payload anti-ship missiles, of a minimum caliber of 431mm and a maximum of 633mm (to simulate torpedoes). -Be able to cover extreme distances outside its own supply lines (High DV and burn time). -Be able to refuel through tankers.
OPTIONALLY: -Be able to resist the Gunship's 100MW violet laser for enough time to allow its own missiles to hit the aforementioned ship in a direct engagement. -Be armored to resist sandblaster railguns -Be as cheap as possible and <=6 kt
This is the first time I do stuff like this, so please do tell me if the challenge results to be too easy/hard and I'll try to adjust the requirements.
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Post by The Astronomer on Apr 29, 2017 12:15:55 GMT
..."A vessel with a low heat signature, armed only with missiles, capable of interdicting deep within enemy shipping lanes"... That doesn't looks very... Feasible. You'll want a hydrogen steamer and extremely cold radiator, which is going to be huge, and detectable by those pesky sensors.
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Post by The Astronomer on Apr 29, 2017 13:25:46 GMT
Anyways, here is the closest thing to 'submarine' I could get. 171 kW of waste heat when idle, 11.6 MW when the rockets' on. 2.44 kt, 54.4 Mc. The noted feature is its shape.
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Post by Dhan on Apr 30, 2017 0:20:49 GMT
Here is my aptly named submission: 2.94 Mc cost Decided to fully embrace the submarine idea and went with a monoprop rocket to get the engines-on heat down to 25.6 kW (which is quite handy, because you won't be going anywhere in a hurry with that puny thing). Missiles still need "submarinization" as they are just a standard 10 km/s, 1kt nuke, NTR missile I had laying around. The armor would only protect you from a stray fart and the entire ship is full of explosive fuel... so uh, good luck comrade.
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Post by Enderminion on Apr 30, 2017 1:20:59 GMT
66cm torpedo tubes on seawolf class attack subs, why the limit of 533mm?
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Post by subunit on Apr 30, 2017 3:15:45 GMT
66cm torpedo tubes on seawolf class attack subs, why the limit of 533mm? HERR KALEUN. DAS ZEEWULF IST EIN SCHWULER AMERIKANISCHER TRASH SUB. DU BRAUCHST NICHST 66cm. G7E IST 53.3cm. IST GUT
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Post by Enderminion on Apr 30, 2017 3:43:12 GMT
fine, many soviet subs had 65cm tubes, by many I mean like most. also the german made Dolphine class sub has 65cm tubes for Popeye nuclear missiles (IDF nuclear subs)
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Post by subunit on Apr 30, 2017 4:02:00 GMT
Does anyone want to do Space Submariner Logistics Roleplay.. I'll be the Space BuOrd guy who forces you to use the Mk14 SpaceTorp. For years you will send me videos of engagements where Mk14 SpaceTorps prematurely detonate or bounce harmlessly off the hulls of their targets while I accuse you of being incompetent rather than testing the torpedo,
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Post by acrosome on Apr 30, 2017 4:58:57 GMT
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Post by subunit on Apr 30, 2017 5:04:44 GMT
Maybe an optional "Q-sub" requirement to carry decoy cargo pods and be mostly unarmored (other than the weapons which would need armor concealment), in exchange for the heat output requirement?
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Post by dwwolf on Apr 30, 2017 8:51:53 GMT
This challenge is limited by crew size. You will need about 30 to 35 crew to handle all the modules.
That is about 13 kW to handle the crew module alone.
My version is powered by an RTG that puts out about 80kW of heat.
300K radiators. 90K exhaust methane NTR as propulsion. 2 low power Torpedo launchers with decane NTR low exhaust Temp missiles. 1 decoy launcher with 115 kW decoys.
I want to add a low dV RAM type missile as well.
Armor is currently.
Top to bottom. 2 cm Si-gel 0.5mm Diamond 1m space 0.5mm amorphous carbon. 5cm Al-foam. 1mm boron.
Front section shielded by 4 layers of (2mm amorphous carbon + 2.5cm Al foam) sandwich rad shield bulkheads.
Total weight around 850 tons with 7ish kms dV. Torpedos have 7 kms dV.
I may add a gun on top for last ditch fun and games.
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Post by HeinzPepperoni on Apr 30, 2017 14:40:21 GMT
66cm torpedo tubes on seawolf class attack subs, why the limit of 533mm? My reference for this challenge was the Los Angeles-class, which mounts 533mm (Also explains the maximum tonnage allowed of 6kt). I'd also like to point out that the 533mm is the most used caliber for torpedoes in modern western submarine fleets. The minimum allowed was there just to let you experiment (And it's also the smallest torpedo I could remember). Didn't quite expect anyone to question those limits, but apparently I was wrong so I'll fix it in the OP. That's why I said "we can pretend".
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Post by ash19256 on Apr 30, 2017 14:47:21 GMT
Well, I honestly think that if I ever get around to attempting this challenge I'm going to build a Q-ship. Simply because by making it look like it's a legitimate cargo vessel with a small heat signature, it's less likely to attract attention.
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Post by dwwolf on Apr 30, 2017 19:11:28 GMT
Pshaw. There may be no stealth in space..but neither is there a perfect observation system.
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Post by someusername6 on Apr 30, 2017 19:54:44 GMT
This challenge is limited by crew size. You will need about 30 to 35 crew to handle all the modules. Not quite. You can get away with only 26 crew, as posted on an example above, by using RTGs (no crew required) instead of fission reactors (crew required: 0.9), and combustion rockets (crew required: 0.2) instead of NTRs (crew required: 0.7). This does mean lots of cold radiators and terrible acceleration, though. Which might be fine if you are only planning on using it to launch missiles from out of range.
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