aiyel
Junior Member
Posts: 83
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Post by aiyel on Oct 31, 2016 21:53:51 GMT
I'm looking for a good resistojet for a KKV missile (using a 1MW reactor as its penetrator)
Minimum exhaust velocity of 5km/s, and best twr in that range
Size isn't that important
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Post by cuddlefish on Oct 31, 2016 22:17:40 GMT
Here's my first crack at it. Uses an explosion risk fuel (Hydrazine) to try to both improve density and get some extra thrust by liberating said energy - 5.5 km/s, 5.35 kN out of a 1.9kg engine.
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Post by someusername6 on Oct 31, 2016 22:43:47 GMT
Here's my crack at it.
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Post by apophys on Nov 1, 2016 0:14:00 GMT
Here's mine. Same thrust; much lighter. I like large gimbal angles, so it's bigger, but you can easily tweak that down. 6.39 km/s exhaust, 25.8 kN thrust & 1.37 kg (1920 TWR). Cost 6.59c. Attachment DeletedCode:
ResistojetModule 6.39 km/s 1.00 MW Decane Gimballed Resistojet PowerSupplied_W 1e+006 Propellant Decane CoilComposition Tantalum Hafnium Carbide ChamberLength_m 0.01 CoilRadius_m 0.0001 ThermalRocket ChamberComposition Diamond ThroatRadius_m 0.0013 ChamberWallThickness_m 0.0016 ChamberContractionRatio 5.4 NozzleExpansionRatio 100 NozzleExpansionAngle_degrees 7 RegenerativeCooling_Percent 1 Injector Composition Lithium PumpRadius_m 0.098 RotationalSpeed_RPM 72 Gimbal InnerRadius_m 0.14 ArmorComposition Silica Aerogel ArmorThickness_m 0.0001 ReactionWheels Composition Lithium RotationalSpeed_RPM 2500 GimbalAngle_degrees 20 Need a reactor?
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tuna
New Member
Posts: 33
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Post by tuna on Nov 1, 2016 1:22:29 GMT
I'm very interested on what kind of reactor you are using for a KKV. Could you post it please?
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Post by apophys on Nov 1, 2016 2:30:43 GMT
Here's what I came up with for a 1 MW disposable reactor. Probably better than whatever the OP was going to use. Code: ThermoelectricFissionReactorModule 1.02 MW Thermoelectric Fission Reactor ReactorCoreDimensions_m 0.1 0.1 NuclearReactor Coolant Ethane Moderator Boron Nitride ModeratorMass_kg 0 Fuel U-233 Dioxide FuelMass_kg 1 FuelEnrichment_Percent 0.016 ControlRodComposition Boron Nitride ControlRodMass_kg 1 NeutronReflector Diamond ReflectorThickness_m 0 AverageNeutronFlux__m2_s 1.3e+020 InnerTurbopump Composition Amorphous Carbon PumpRadius_m 0.12 RotationalSpeed_RPM 390 ThermocoupleInnerDimensions_m 0.12 0.41 Thermocouple PTypeComposition Tungsten NTypeComposition Tantalum Length_m 0.001 ThermocoupleExitTemperature_K 2500 OuterCoolant Sodium OuterTurbopump Composition Lithium PumpRadius_m 0.05 RotationalSpeed_RPM 290
Comparison to stock 1 MW reactor: 300 times lighter and 800 times cheaper. My god, stock designs are terrible. Attachment Deleted
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aiyel
Junior Member
Posts: 83
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Post by aiyel on Nov 1, 2016 3:54:15 GMT
Here's what I came up with for a 1 MW disposable reactor. Probably better than whatever the OP was going to use. Code: ThermoelectricFissionReactorModule 1.02 MW Thermoelectric Fission Reactor ReactorCoreDimensions_m 0.1 0.1 NuclearReactor Coolant Ethane Moderator Boron Nitride ModeratorMass_kg 0 Fuel U-233 Dioxide FuelMass_kg 1 FuelEnrichment_Percent 0.016 ControlRodComposition Boron Nitride ControlRodMass_kg 1 NeutronReflector Diamond ReflectorThickness_m 0 AverageNeutronFlux__m2_s 1.3e+020 InnerTurbopump Composition Amorphous Carbon PumpRadius_m 0.12 RotationalSpeed_RPM 390 ThermocoupleInnerDimensions_m 0.12 0.41 Thermocouple PTypeComposition Tungsten NTypeComposition Tantalum Length_m 0.001 ThermocoupleExitTemperature_K 2500 OuterCoolant Sodium OuterTurbopump Composition Lithium PumpRadius_m 0.05 RotationalSpeed_RPM 290
Comparison to stock 1 MW reactor: 300 times lighter and 800 times cheaper. My god, stock designs are terrible. I was actually using a trio of custom reactors. Yes, this one shaves about 30% off the weight of the combined smaller units. Very nice. About to put the upgraded model to the test. I should point out that these are hilariously op (if they hit)
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Post by dwwolf on Nov 1, 2016 9:29:13 GMT
Errrrrr Look at the kilowatt range radiation leakage...... How much shielding does your crew have ?
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Post by goduranus on Nov 1, 2016 10:07:21 GMT
It's for an unmanned vehicle
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Post by apophys on Nov 1, 2016 11:01:53 GMT
Also, boron in your armor and/or crew module will basically negate thermal neutrons, which are the type it's leaking most (ethane coolant takes care of the fast neutrons).
If you're still worried about it, you can max the enrichment % and lower neutron flux to match (tweak other settings). It'll lower the leakage by a factor of about 70, but will increase cost by 30% because U-233 is quite a bit more expensive than U-238. I don't consider this trade to be worth it for a disposable munition when boron shielding is so easy.
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Post by dwwolf on Nov 1, 2016 12:18:00 GMT
You mean the un manned vehicle that is launched by the manned vehicle ? I generally use Dyneema for the crew modules...with this thing i'd have to change over lol.
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aiyel
Junior Member
Posts: 83
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Post by aiyel on Nov 1, 2016 15:47:39 GMT
Here's what I came up with for a 1 MW disposable reactor. Probably better than whatever the OP was going to use. Code: ThermoelectricFissionReactorModule 1.02 MW Thermoelectric Fission Reactor ReactorCoreDimensions_m 0.1 0.1 NuclearReactor Coolant Ethane Moderator Boron Nitride ModeratorMass_kg 0 Fuel U-233 Dioxide FuelMass_kg 1 FuelEnrichment_Percent 0.016 ControlRodComposition Boron Nitride ControlRodMass_kg 1 NeutronReflector Diamond ReflectorThickness_m 0 AverageNeutronFlux__m2_s 1.3e+020 InnerTurbopump Composition Amorphous Carbon PumpRadius_m 0.12 RotationalSpeed_RPM 390 ThermocoupleInnerDimensions_m 0.12 0.41 Thermocouple PTypeComposition Tungsten NTypeComposition Tantalum Length_m 0.001 ThermocoupleExitTemperature_K 2500 OuterCoolant Sodium OuterTurbopump Composition Lithium PumpRadius_m 0.05 RotationalSpeed_RPM 290
Comparison to stock 1 MW reactor: 300 times lighter and 800 times cheaper. My god, stock designs are terrible. So my new design uses your reactor and resistojet designs... I actually had to do some... modifications... to account for the fact the reactor is so much lighter (and a single unit, as opposed to the trio I was using previously) to get respectable damage out of it. So, strictly speaking, it is no longer a KKV, though most of the damage does come from direct kinetic impacts rather than the payload. A payload of one nuclear hand grenade and 10 10x1cm osmium rods. At 100km relative stop, the thing's still burning when it hits the target, though almost empty. That's about the perfect engagement range. The first few usually hit hull, punching nice big ragged entry holes thanks to the size of the missile and its radiators. subsequent flights tend to go through the same hole doing nothing, or get some glitchy damage results. So, a 500ish ton explosive and some osmium fragments will detonate inside the hull and do Bad Things to the internals. Granted, micronukes like that sometimes get... odd... results. I took a carrier with four launchers for these things up against a pair of laser frigates, the first died after the #3 salvo... the other survived with a railgun intact until weapons range, and even my tactical missile ships are armored solely against lasers, trusting in their missiles for standoff damage capability and point defense.
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