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Post by Rocket Witch on Jun 15, 2017 17:47:01 GMT
and human crew can slowly refill the propellant tanks for a little extra dV. "Missiles incoming! Get exercising so we can evade!" You don't think waste CO 2 is better of being recycled into O 2? And doesn't what you say also mostly apply to H 2O? Good density, easy to find (From Venus and the Moon all the way to the Oort cloud) and probably a better exhaust velocity in most drives than CO 2. And the water in your propellant tanks can also be used for life support and radiation shielding. I think we may see CO2 dominate the inner system, and H2O dominate the outer system. |
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Post by cyborgleopard on Jun 15, 2017 20:12:30 GMT
Still, a CO2 NTR should have a better TWR, which is the entire point of the NTR in a dual drive setup; MPDs don't have the thurst to doge anything in terminal guidance. Hmmmmm... and a resistor jet would model a bi-modal NTR... but then I'd have to choose between thrust and the laser... GAH! I'm gonna have to learn resistor jets now. Oh well, it's a good problem to have. Resistojets are easy. If you've done NTRs and Chem rockets, you can do Resistojets. You want a coil with a high melting point. (Tantalum Hafnium Carbide). I haven't found any difference in making the coil larger aside from it going outside the engine.. Fenagle the fuel flow and power input to the highest exhaust velocity you can get without melting something. The physics of the injector, gimbal and nozzle are all the same as the CR/NTR. Because the highest melting coil material has a higher melting point than U-dioxide, you can get somewhat higher velocities. The main downside is the power requirements. If you have a reasonably light and efficient reactor design, this won't be a problem, I find I need a few hundred megawatts of resistos to get capships moving at half a G. |
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Post by Hicks on Jun 16, 2017 15:42:51 GMT
Whelp, on further study, and by study I mean screwing around in the module designer, I will not be converting from Methane to CO2. Even though CO2 is like 1/3 the cost of Methane, the performance hit is just too great: carbon dioxide gets me half the dV in MPDs for the same wattage. Now I'm just playing with 1.01 Gw, so maybe something amazing happens if I strap a thousand reactors to one another and start messing with Terrawatts, but that's not something I wish to design. anyhoo, here's a battleship, the ".txt" should be attatched. So I'm currently running a destroyer/battleship combination navy; methane is my reaction mass of choice [*removed text about the destroyer*] The BB-LCmn-001 Gigawatt is the 4th iteration of battleship, designed after the last update broke my cannon BB line. Although is masses 6.1 Kt and costs 41.1 Mc, it exceeds the destroyer in range and firepower due to it's 1.01 Gw reactor. It shares the same kind of dual drive, but supersized; getting either 72.6 Km/s dV or 1.39g acceleration. It shares the same armor scheme with the destroyer (500um of diamond,1cm amorphous carbon, 1m graphite aerogel, 2cm boron, and 8cm Boron under the first 40% of the vessel, plus a pointed bow. It has the same nuclear missile cannon, but carries a thousand missiles, and the largest difference is the 1 GW ventral extruded near ultraviolet laser turret, which hits for 105 MW at 1000 Km, which totally out classes the destroyer. Every turret is armored with 20 cm of amorphous carbon; the cannons are driven by neodymium electronic motors while the lasers use momentum wheels, boron for the 100 Mw and polyethylene for the 1 Gw. The 316 mm missile has, as previously stated, a 1.02 Kt boosted fission warhead. It's armor scheme is 500 um of diamond over 5 mm of amorphous carbon. Each has 4x800 g methane tanks, and are propelled by a miniature NTR that accelerate at 1.39g for just over a minute. Each masses 20.5kg and costs 485c. They get their initial boost from 50kg of TNT from the dorsal extruded cannon turret. The nuke is set to arm within 20 Km of an enemy vessel, drone, or missile, and will detonate at closest approach. Standard doctrine is to coast into laser range surrounded by a cloud of 20-200 missiles, open up with the long range laser, and start shooting missiles from the cannon. Range really isn't an issue the destroyer can go anywhere in the solar system, and the battleship can come back after. In a perfect world, the missile cannon would be used to boost a constellation of nukes across orbits, but in practice they just fly off in a random direction unless it's set to NOT split the fleet, then it magically kills the 2 Km/s relative velocity and somehow flies in formation with the destroyer/battleship. Overview  External and dV/acceleration (the numbers are weird because it's a dual drive Methane NTR/MPD combination)  Internals and cost breakdown  Dorsal extruded cannon turret  Cannon's guided ordinance, 1.02 Kt boosted fission nuclear missile  Ventral extruded 1.0 Gw laser  Laser cost, mass, and turret composition  |
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Post by apophys on Jun 16, 2017 16:40:35 GMT
Whelp, on further study, and by study I mean screwing around in the module designer, I will not be converting from Methane to CO2. Even though CO2 is like 1/3 the cost of Methane, the performance hit is just too great: carbon dioxide gets me half the dV in MPDs for the same wattage. Now I'm just playing with 1.01 Gw, so maybe something amazing happens if I strap a thousand reactors to one another and start messing with Terrawatts, but that's not something I wish to design. Need a hand with that? My 1 GW CO 2 MPD has a bit over 90% of the velocity of my 1 GW methane MPD.  |
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Post by The Astronomer on Jun 16, 2017 17:02:04 GMT
Whelp, on further study, and by study I mean screwing around in the module designer, I will not be converting from Methane to CO2. Even though CO2 is like 1/3 the cost of Methane, the performance hit is just too great: carbon dioxide gets me half the dV in MPDs for the same wattage. Now I'm just playing with 1.01 Gw, so maybe something amazing happens if I strap a thousand reactors to one another and start messing with Terrawatts, but that's not something I wish to design. Need a hand with that? My 1 GW CO 2 MPD has a bit over 90% of the velocity of my 1 GW methane MPD. You should collect CO2 emission and turn them into remass. Solving climate change and getting your favorite remass in one shot. Wait a minute. |
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Post by apophys on Jun 16, 2017 17:56:30 GMT
Ventral extruded 1.0 Gw laser Laser cost, mass, and turret composition Using silver for the output coupler is unnecessarily gimping your laser. Try fused quartz or diamond. This is probably the first time I've seen RP-1 used as cavity coolant. Hydrogen is the standard; much lighter & cheaper. The cavity should be better if circularized more, and you should be able to make it smaller without sacrificing power. An optimized laser cavity is insignificant in mass and cost compared to its mirror and turret. |
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Post by Hicks on Jun 16, 2017 21:42:04 GMT
So your MPD inspired me to switch over to CO2, and it - is - nutz.
98.2km/s dV with an MPD. Cost dropped down to 25Mc. HoW did that happen? THE WHOLE SHIP SUCKED IT'S GUT IN and has a cross section of 1650m^2! The density is real. The CO2 NTR can get ~4.75km/s dV. It's down to 5.1kt! Man that stuff is addicting. And most importantly, my fleet is no longer farting through space! Now it's more like a very angry wheeze...
Damn. Now I gotta reclassified that battleship as a CO2 destroyer with a gigawatt laser, the damn thing is cheaper and smaller than half of my destroyer iterations. Thanks for shining me on to CO2.
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Post by The Astronomer on Jun 17, 2017 2:14:07 GMT
So your MPD inspired me to switch over to CO2, and it - is - nutz. 98.2km/s dV with an MPD. Cost dropped down to 25Mc. HoW did that happen? THE WHOLE SHIP SUCKED IT'S GUT IN and has a cross section of 1650m^2! The density is real. The CO2 NTR can get ~4.75km/s dV. It's down to 5.1kt! Man that stuff is addicting. And most importantly, my fleet is no longer farting through space! Now it's more like a very angry wheeze... Damn. Now I gotta reclassified that battleship as a CO2 destroyer with a gigawatt laser, the damn thing is cheaper and smaller than half of my destroyer iterations. Thanks for shining me on to CO2. |
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Post by captinjoehenry on Jun 17, 2017 19:46:44 GMT
Ok here is my latest weapon system. It is a 1.1 GW Extreme UV laser with 39.5% efficiency and is fairly affordable and light weight:  Only two mod added materials needed molten tin and the lasing medium Ce:LLF. Costs 87.4 kc and weighs in at only 9.43 tons.
LaserModule 1.10 GW Ce:LLF Extreme Ultraviolet Laser
UsesCustomName false
ArcLamp
GasComposition Molten Tin
EnvelopeComposition Fused Quartz
PowerSupplied_W 1.1e+009
Radius_m 0.001
CavityWallComposition Aluminum
CavityCoolantComposition Hydrogen
CavitySemimajorAxis_m 1
CavitySemiminorAxis_m 0.8
GainMedium Ce:LLF
OpticalNodes 70000000
LasingRodRadius_m 0.0095
Mirror
Composition Aluminum
OutputCoupler
Composition Fused Quartz
CoolantTurbopump
Composition Boron
PumpRadius_m 2.4
RotationalSpeed_RPM 43
CoolantInletTemperature_K 920
FrequencyDoubler
NonlinearOptic
Composition Potassium Titanyl Phosphate
OpticLength_m 0.1
OpticRadius_m 0.0221
SecondFrequencyDoubler
NonlinearOptic
Composition Silver Gallium Selenide
OpticLength_m 0.1
OpticRadius_m 0.276
ApertureRadius_m 0.94
FocusingMirror
Composition Aluminum
Unmounted true
EngagementRange_km 1000
TargetsShips true
TargetsShots true
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Post by RiftandRend on Jun 18, 2017 2:54:21 GMT
That's the highest efficiency laser I have seen. You may even be able to break 50% if you use the modded mirror materials from the modded compendium.
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Post by captinjoehenry on Jun 18, 2017 3:06:27 GMT
That's the highest efficiency laser I have seen. You may even be able to break 50% if you use the modded mirror materials from the modded compendium. Sadly attempting to use silicon, platinum or silicon dioxide as mirrors doesn't work at all and massively drops efficiency. If you know of other mirror materials I would be happy to try them out. |
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Post by RiftandRend on Jun 18, 2017 3:30:25 GMT
Give rhodium a try. It's about as good as silver and should allow you to push the outlet temp to ~2000 kelvin with a minor loss in efficiency.
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Post by captinjoehenry on Jun 18, 2017 3:54:47 GMT
Give rhodium a try. It's about as good as silver and should allow you to push the outlet temp to ~2000 kelvin with a minor loss in efficiency. Sadly the gain medium melts at 1,000 degrees so it isn't even worth while  |
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Post by dwwolf on Jun 18, 2017 23:00:00 GMT
Where can I find dwwolf 's ship? Nowhere, It uses many modded materials and fusion. It has no relation to the basic game because of the fusion rocket. Basically its a 15m thick cylinder 129m long, the fusion rocket is about 24m long ....It is very vulnerable to flak. It has 1300ish kms dV. Mass is 1400 tons of which only 100 tons are fuel....that alone should give you an idea of how much you can dedicate to armor and weapons. I currently have dedicated 60% to armor. and 15% to weapons. Armor is very spaced to try to negate turret holes. |
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Post by Dhan on Jun 22, 2017 8:17:40 GMT
This patch gave us the tools we need for reasonable serially staged rockets. But, as is tradition, these new mechanics come in unexpected ways  |
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