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Post by Pttg on May 6, 2017 20:43:49 GMT
The Great Mistake is well underway. We have our facilities in the high outback of Austrailia, so we're insulated from a lot of problems, but we have to get off this rock as soon as possible. Your goal is to design a ship that can launch from Earth and make orbit. (The skyhooks are too crowded or something.) The good news is that we can use any kind of propulsion we like. Want to launch with a nearly-molten 97% enriched NTR? Go right ahead, we already have too much fallout as it is, a little more won't hurt. All that matters is cost-effectiveness -- the cost per seat. In actuality, there will probably be two or even three people for every one "seat," since the ship just needs to make it to orbit, but the nominal assigned seating is what we're using to keep things simple. Challenge:Build a ship that has: - Greater than 1g0 thrust/mass ratio fully fueled, and has at least 9.4 km/s delta-v.
- Aerodynamic armor that can reasonably survive takeoff (no 1 micron lithium foil).
- Main engine thrust pressure >100kpa. Only engines that will be used for flight in lower atmosphere need this.
The craft only needs to make one flight, however; it doesn't need to re-enter, nor does it need long linger-time on orbit or any combat-relevant armor or weapons. Your metric for this challenge is (total cost, credits)/(total habitat capacity). Stock Game:Randomletters:
Argopeilacos: GTFO Heavy -- 27,428 ¢/seat (995 passengers, 55 crew; 28.8 M¢)
Deskjetser: Tower of Babel -- 28,960 ¢/seat (62,330) passengers, 170 crew; 1.81 G¢) *Includes 4kt cargo!! Nerd1000: Exodus -- 29,125 ¢/seat (24000 seats; 699 M¢) *1.22 km tall! PTTG: Spartan Keel -- 29,334 ¢/seat (266 passengers, 34 crew; 8.8 M¢) Randomletters: HVL-N -- 30,250 ¢/seat (3,916 passengers, 84 crew; 121 M¢) Apophys: Terra Spore 1800 -- 32,500 ¢/seat (1722 passengers, 78 crew; 58.4 M¢) *Reusable. 14,158 ¢/passenger fuel costs. Substantial deep-space capability. Argopeilacos: GTFO Light -- 34,083 ¢/seat (202 passengers, 38 crew; 8.18 M¢) *Includes 200 tons of cargo. Argopeilacos: Earth Escape -- 37,960 ¢/seat (196 passengers, 54 crew; 9.49 M¢) *Includes 200 tons of cargo. Someusername6: Escape Ethane -- 45,875 ¢/seat (129 passengers, 31 crew; 7.34 M¢) Mmmfriedrice: Escape TSTO -- 46,858 ¢/seat (103 passengers, 37 crew; 6.56 M¢) *Includes 50 tons of cargo. Randomletters: HVL-C -- 55,000 ¢/seat (3,135, 65 crew; 176 M¢) *Pure chemical propulsion. Nerd1000: Escape 1 -- 73,847 ¢/seat (93 passengers, 37 crew; 9.6 M¢) Deskjetser: The Boron Cucumber -- 75,500 ¢/seat (20927 passengers, 73 crew; 1.58 G¢) *Includes 2kt of cargo! Zerraspace: Reusable Earth SSTO --178,626 ¢/seat (655 passengers, 45 crew; 117 M¢) *Reusable, realistic materials and application. 101,005 ¢/seat fuel costs. AdmiralObvious: Orbiter -- 397,000 ¢/seat (78 passengers, 22 crew; 39.7 M¢) *Pure chemical propulsion. Light Mods:(Mods that fit the design of the stock game by adding normal, well-understood materials, or by modifying the limits file without exploits) Heavy Mods:
(Mods that add supermaterials like monolithic graphene or graphene cermet fuel materials, or that modify the limits file to an extreme degree) The Astrogator: EVC 40 -- 91,500 ¢/seat The Astrogator: EVC 100 -- 68,900 ¢/seat The Astrogator: EVC 1200 -- 47,500 ¢/seat The Astrogator: EVC 1800 -- 44,278 ¢/seat The Astrogator: Evacuator 1200 -- 51,500 ¢/seat (1200 seats; 61.8 Mc) Note, I'm retiring from updating this OP for a while. I may check in at odd intervals.
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Post by The Astronomer on May 7, 2017 1:49:54 GMT
Reminder: Engine nozzle performs differently (worse) in atmosphere than in space.
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Post by nerd1000 on May 7, 2017 1:59:31 GMT
Reminder: Engine nozzle performs differently (worse) in atmosphere than in space. ensure that the pressure at the nozzle exit is more than 100 kPa. That way you'll have no problems. This will require a NTR. Chemical rockets cannot attain an acceptable payload fraction without staging.
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Post by Pttg on May 7, 2017 2:26:54 GMT
Drop tanks may help a small amount.
My experiments have been slowed a great deal by a power outage. I did discover that polyethylene makes for a fairly light and cheap crew module.
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Post by The Astronomer on May 7, 2017 2:28:09 GMT
'A little more fallout can't hurt' How about a giant nuke pulse drive
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Post by Enderminion on May 7, 2017 2:37:35 GMT
'A little more fallout can't hurt' How about a giant nuke pulse drive four thousand tons of battleship lifting into the sky on the shockwave of nuclear destruction
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Post by nerd1000 on May 7, 2017 2:43:58 GMT
Here's my first attempt. It carries 93 passengers and 37 crew to Low earth orbit for 9.6 Mc, with around 200 m/s of reserve Delta-V. The Hydrogen Deuteride NTRs have an expansion ratio of 5.2, allowing an exit pressure of 110 kPa (which means that these nozzles are actually slightly underexpanded at sea level). Vacuum exhaust velocity is around 8.49 km/s.
CrewModule 100 Crew Module
UsesCustomName false
CrewCapacity 100
Decks 15
StructureMaterial Boron
ShellThickness_m 0.01
NuclearThermalRocketModule 8.49 km/s Hydrogen Deuteride Gimballed Nuclear Thermal Rocket earth liftoff
UsesCustomName true
ReactorCoreHeight_m 0.34
NuclearReactor
Coolant Hydrogen Deuteride
Moderator Graphite
ModeratorMass_kg 0
Fuel U-233 Dioxide
FuelMass_kg 39
FuelEnrichment_Percent 0.5
ControlRodComposition Boron Nitride
ControlRodMass_kg 50
NeutronReflector Pyrolytic Carbon
ReflectorThickness_m 0.5
AverageNeutronFlux__m2_s 1.7e+020
ThermalRocket
ChamberComposition Boron
ThroatRadius_m 0.16
ChamberWallThickness_m 0.0017
ChamberContractionRatio 2.7
NozzleExpansionRatio 5.2
NozzleExpansionAngle_degrees 11.62
RegenerativeCooling_Percent 0.811
Injector
Composition Aluminum Copper Lithium
PumpRadius_m 0.27
RotationalSpeed_RPM 2000
Gimbal
InnerRadius_m 0.39
ArmorComposition Alpha-2 Titanium Aluminide
ArmorThickness_m 0.0029
MomentumWheels
Composition Polyethylene
RotationalSpeed_RPM 2300
GimbalAngle_degrees 19.26
PropellantTankModule 490 t Hydrogen Deuteride Tank
UsesCustomName false
Propellant Hydrogen Deuteride
StructureComposition Boron
ReactionMass_kg 4.9e+005
HeightToRadiusRatio 11
AdditionalArmorThickness_m 0
PropellantTankModule 490 t Hydrogen Deuteride Tank
UsesCustomName false
Propellant Hydrogen Deuteride
StructureComposition Boron
ReactionMass_kg 4.9e+005
HeightToRadiusRatio 11
AdditionalArmorThickness_m 0
CrewModule 30 Crew Module 2
UsesCustomName false
CrewCapacity 30
Decks 6
StructureMaterial Boron
ShellThickness_m 0.042
ThermoelectricFissionReactorModule 140 kW Thermoelectric Fission Reactor
UsesCustomName false
ReactorCoreDimensions_m 0.1 0.1
NuclearReactor
Coolant Sodium
Moderator Graphite
ModeratorMass_kg 4
Fuel U-233 Dioxide
FuelMass_kg 1
FuelEnrichment_Percent 0.16
ControlRodComposition Boron Nitride
ControlRodMass_kg 0.5
NeutronReflector Pyrolytic Carbon
ReflectorThickness_m 0
AverageNeutronFlux__m2_s 1.1e+018
InnerTurbopump
Composition Amorphous Carbon
PumpRadius_m 0.06
RotationalSpeed_RPM 110
ThermocoupleInnerDimensions_m 0.099 0.076
Thermocouple
PTypeComposition Osmium
NTypeComposition Tungsten
Length_m 0.0045
ThermocoupleExitTemperature_K 1500
OuterCoolant Sodium
OuterTurbopump
Composition Polyethylene
PumpRadius_m 0.071
RotationalSpeed_RPM 81
RadiatorModule 10x3 Polyethylene Radiator
UsesCustomName false
Composition Polyethylene
PanelWidth_m 0.75
Height_m 2.6
Thickness_m 0.001
ArmorThickness_m 0.001
Panels 13
FrontTaper_radians 0
BackTaper_radians 0
SurfaceFinish null
RadiatorModule 10x3 Polyethylene Radiator
UsesCustomName false
Composition Polyethylene
PanelWidth_m 0.75
Height_m 2.6
Thickness_m 0.001
ArmorThickness_m 0.001
Panels 13
FrontTaper_radians 0
BackTaper_radians 0
SurfaceFinish null
CraftBlueprint Escape 1
Modules
100 Crew Module 1 7.2998 null 0
8.49 km/s Hydrogen Deuteride Gimballed Nuclear Thermal Rocket earth liftoff 7 0 null 0
490 t Hydrogen Deuteride Tank 1 -0.5 null 0
490 t Hydrogen Deuteride Tank 1 0 null 0
5.00 m x 0 m Spacer 1 132.02 null 0
30 Crew Module 2 1 14.6 null 0
140 kW Thermoelectric Fission Reactor 1 -0.75 null 0
2x1 Silicon Carbide Radiator 2 8.8003 140 kW Thermoelectric Fission Reactor 0
10x3 Polyethylene Radiator 2 31.957 30 Crew Module 2 0
8.00 m Diameter 6.00 cm Radiation Shield 1 -0.625 null 0
8.00 m Diameter 6.00 cm Radiation Shield 1 -0.5625 null 0
8.00 m Diameter 6.00 cm Radiation Shield 1 -0.53125 null 0
8.00 m Diameter 6.00 cm Radiation Shield 1 -0.51563 null 0
10x3 Polyethylene Radiator 2 41.642 100 Crew Module 0
Armor
ArmorLayers
Boron 0.001 0.3 0.015 1 1
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Post by The Astronomer on May 7, 2017 5:41:27 GMT
Here's my first attempt. It carries 93 passengers and 37 crew to Low earth orbit for 9.6 Mc, with around 200 m/s of reserve Delta-V. The Hydrogen Deuteride NTRs have an expansion ratio of 5.2, allowing an exit pressure of 110 kPa (which means that these nozzles are actually slightly underexpanded at sea level). Vacuum exhaust velocity is around 8.49 km/s. CrewModule 100 Crew Module
UsesCustomName false
CrewCapacity 100
Decks 15
StructureMaterial Boron
ShellThickness_m 0.01
NuclearThermalRocketModule 8.49 km/s Hydrogen Deuteride Gimballed Nuclear Thermal Rocket earth liftoff
UsesCustomName true
ReactorCoreHeight_m 0.34
NuclearReactor
Coolant Hydrogen Deuteride
Moderator Graphite
ModeratorMass_kg 0
Fuel U-233 Dioxide
FuelMass_kg 39
FuelEnrichment_Percent 0.5
ControlRodComposition Boron Nitride
ControlRodMass_kg 50
NeutronReflector Pyrolytic Carbon
ReflectorThickness_m 0.5
AverageNeutronFlux__m2_s 1.7e+020
ThermalRocket
ChamberComposition Boron
ThroatRadius_m 0.16
ChamberWallThickness_m 0.0017
ChamberContractionRatio 2.7
NozzleExpansionRatio 5.2
NozzleExpansionAngle_degrees 11.62
RegenerativeCooling_Percent 0.811
Injector
Composition Aluminum Copper Lithium
PumpRadius_m 0.27
RotationalSpeed_RPM 2000
Gimbal
InnerRadius_m 0.39
ArmorComposition Alpha-2 Titanium Aluminide
ArmorThickness_m 0.0029
MomentumWheels
Composition Polyethylene
RotationalSpeed_RPM 2300
GimbalAngle_degrees 19.26
PropellantTankModule 490 t Hydrogen Deuteride Tank
UsesCustomName false
Propellant Hydrogen Deuteride
StructureComposition Boron
ReactionMass_kg 4.9e+005
HeightToRadiusRatio 11
AdditionalArmorThickness_m 0
PropellantTankModule 490 t Hydrogen Deuteride Tank
UsesCustomName false
Propellant Hydrogen Deuteride
StructureComposition Boron
ReactionMass_kg 4.9e+005
HeightToRadiusRatio 11
AdditionalArmorThickness_m 0
CrewModule 30 Crew Module 2
UsesCustomName false
CrewCapacity 30
Decks 6
StructureMaterial Boron
ShellThickness_m 0.042
ThermoelectricFissionReactorModule 140 kW Thermoelectric Fission Reactor
UsesCustomName false
ReactorCoreDimensions_m 0.1 0.1
NuclearReactor
Coolant Sodium
Moderator Graphite
ModeratorMass_kg 4
Fuel U-233 Dioxide
FuelMass_kg 1
FuelEnrichment_Percent 0.16
ControlRodComposition Boron Nitride
ControlRodMass_kg 0.5
NeutronReflector Pyrolytic Carbon
ReflectorThickness_m 0
AverageNeutronFlux__m2_s 1.1e+018
InnerTurbopump
Composition Amorphous Carbon
PumpRadius_m 0.06
RotationalSpeed_RPM 110
ThermocoupleInnerDimensions_m 0.099 0.076
Thermocouple
PTypeComposition Osmium
NTypeComposition Tungsten
Length_m 0.0045
ThermocoupleExitTemperature_K 1500
OuterCoolant Sodium
OuterTurbopump
Composition Polyethylene
PumpRadius_m 0.071
RotationalSpeed_RPM 81
RadiatorModule 10x3 Polyethylene Radiator
UsesCustomName false
Composition Polyethylene
PanelWidth_m 0.75
Height_m 2.6
Thickness_m 0.001
ArmorThickness_m 0.001
Panels 13
FrontTaper_radians 0
BackTaper_radians 0
SurfaceFinish null
RadiatorModule 10x3 Polyethylene Radiator
UsesCustomName false
Composition Polyethylene
PanelWidth_m 0.75
Height_m 2.6
Thickness_m 0.001
ArmorThickness_m 0.001
Panels 13
FrontTaper_radians 0
BackTaper_radians 0
SurfaceFinish null
CraftBlueprint Escape 1
Modules
100 Crew Module 1 7.2998 null 0
8.49 km/s Hydrogen Deuteride Gimballed Nuclear Thermal Rocket earth liftoff 7 0 null 0
490 t Hydrogen Deuteride Tank 1 -0.5 null 0
490 t Hydrogen Deuteride Tank 1 0 null 0
5.00 m x 0 m Spacer 1 132.02 null 0
30 Crew Module 2 1 14.6 null 0
140 kW Thermoelectric Fission Reactor 1 -0.75 null 0
2x1 Silicon Carbide Radiator 2 8.8003 140 kW Thermoelectric Fission Reactor 0
10x3 Polyethylene Radiator 2 31.957 30 Crew Module 2 0
8.00 m Diameter 6.00 cm Radiation Shield 1 -0.625 null 0
8.00 m Diameter 6.00 cm Radiation Shield 1 -0.5625 null 0
8.00 m Diameter 6.00 cm Radiation Shield 1 -0.53125 null 0
8.00 m Diameter 6.00 cm Radiation Shield 1 -0.51563 null 0
10x3 Polyethylene Radiator 2 41.642 100 Crew Module 0
Armor
ArmorLayers
Boron 0.001 0.3 0.015 1 1
Put it in the spoiler...
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Post by mmmfriedrice on May 7, 2017 23:12:33 GMT
So is there a minimum recommended armor thickness and a restriction against drop tanks? I managed to cook up a drop tank Methane NTR craft that carries 103 passengers/37 crew. It loses goes from 9.99 to 9.50 km/s vacuum Delta V with an added 50t cargo bay. userdesign text is here:
CrewModule 40 Crew Module 3 UsesCustomName false CrewCapacity 40 Decks 9 StructureMaterial Polyethylene ShellThickness_m 0.015
CrewModule 100 Crew Module UsesCustomName false CrewCapacity 100 Decks 15 StructureMaterial Polyethylene ShellThickness_m 0.02
ThermoelectricFissionReactorModule 44.4 kW Thermoelectric Fission Reactor UsesCustomName false ReactorCoreDimensions_m 0.08 0.11 NuclearReactor Coolant Sodium Moderator Graphite ModeratorMass_kg 0 Fuel TaHfC - U-233 FuelMass_kg 4.9 FuelEnrichment_Percent 0.48 ControlRodComposition Boron Nitride ControlRodMass_kg 4 NeutronReflector Pyrolytic Carbon ReflectorThickness_m 0.25 AverageNeutronFlux__m2_s 9.5e+016 InnerTurbopump Composition Amorphous Carbon PumpRadius_m 0.033 RotationalSpeed_RPM 150.01 ThermocoupleInnerDimensions_m 0.17 0.17 Thermocouple PTypeComposition Osmium NTypeComposition Tungsten Length_m 0.001 ThermocoupleExitTemperature_K 1500 OuterCoolant Sodium OuterTurbopump Composition Calcium PumpRadius_m 0.016 RotationalSpeed_RPM 96
PropellantTankModule 300 t Methane Drop Tank 2 UsesCustomName false Propellant Methane StructureComposition Boron ReactionMass_kg 3e+005 HeightToRadiusRatio 8.3 AdditionalArmorThickness_m 0 External ExplosiveBoltMass_kg 1 ExplosiveBoltComposition TNT
PropellantTankModule 1.000 kt Methane Tank 2 UsesCustomName false Propellant Methane StructureComposition Boron ReactionMass_kg 1e+006 HeightToRadiusRatio 7.72 AdditionalArmorThickness_m 0
NuclearThermalRocketModule 5.90 km/s Methane Gimballed Nuclear Thermal Rocket UsesCustomName false ReactorCoreHeight_m 0.34 NuclearReactor Coolant Methane Moderator Graphite ModeratorMass_kg 0 Fuel U-233 Dioxide FuelMass_kg 37 FuelEnrichment_Percent 0.5 ControlRodComposition Boron Nitride ControlRodMass_kg 30 NeutronReflector Pyrolytic Carbon ReflectorThickness_m 0.35 AverageNeutronFlux__m2_s 1e+020 ThermalRocket ChamberComposition Boron ThroatRadius_m 0.17 ChamberWallThickness_m 0.0017 ChamberContractionRatio 2.2 NozzleExpansionRatio 4.3 NozzleExpansionAngle_degrees 4.7 RegenerativeCooling_Percent 1 Injector Composition Aluminum Copper Lithium PumpRadius_m 0.25 RotationalSpeed_RPM 1700 Gimbal InnerRadius_m 0.37 ArmorComposition Alpha-2 Titanium Aluminide ArmorThickness_m 0.0029 MomentumWheels Composition Polyethylene RotationalSpeed_RPM 2300 GimbalAngle_degrees 19
CraftBlueprint Escape TSTO Modules 5.90 km/s Methane Gimballed Nuclear Thermal Rocket 6 0 null 0 1.000 kt Methane Tank 2 1 0 null 0 100 Crew Module 1 28.262 null 0 300 t Methane Drop Tank 2 4 18.098 null 0.79 8.00 m Diameter 6.00 cm Radiation Shield 1 -0.5 null 0 8.00 m Diameter 6.00 cm Radiation Shield 1 0.5 null 0 44.4 kW Thermoelectric Fission Reactor 1 -0.25 null 0 2x1 Silicon Carbide Radiator 2 2.3022 44.4 kW Thermoelectric Fission Reactor 0 6x3 Aluminum Radiator 4 35.133 100 Crew Module 0 10.0 m x 0 m Spacer 1 121.75 null 0 8.00 m Diameter 6.00 cm Radiation Shield 1 0.5 null 0 40 Crew Module 3 1 29.262 null 0 6x3 Aluminum Radiator 2 40.311 40 Crew Module 3 0 Armor ArmorLayers Boron 0.01 0.2 0 1 1
Attachments:
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Post by Pttg on May 7, 2017 23:28:25 GMT
Strictly speaking, the prompt didn't ask for armor, but it's probably a good idea to have something that'll deal with air resistance on the way up. I think I will add a note to the OP suggesting minimal armor. Drop tanks are totally allowed.
I really like that you included a cargo bay; it just makes rational sense. I can't think of a good way to score that, though. If you want to make a modified version with an extra 50 ton crew module instead, I'd be happy to include it. I figure that these ships are going to be launched standing-room only anyway (at least compared to the way crew modules are normally used).
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Post by mmmfriedrice on May 8, 2017 1:02:02 GMT
I can't think of a good way to score that, though. If you want to make a modified version with an extra 50 ton crew module instead, I'd be happy to include it. Score it without the cargo module. I assume thrust pressure >100kpa gives us a somewhat accurate atmospheric dV, but if it doesn't, the fact that this thing is on the higher end of the Earth-orbit dV budget is probably a good thing. Also, a 50t crew module would probably crater the outer fuselage mass budget. Leave the borderline-lethal min-maxing for the military!
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Post by AdmiralObvious on May 8, 2017 3:21:32 GMT
Here's my crack at it. 39.7 Mc, able to take 22 crew, and 78 passengers. Assuming the plastic shell doesn't fall apart or melt on exiting the atmosphere (it's coated in graphite to help) you should be able to get there with 110 m/s to spare. You don't need fancy pants nuclear rockets when the classic OH2 mix works completely fine. CombustionRocketModule 2.89 km/s LOX LH2 Gimballed Combustion Rocket
UsesCustomName false
Reaction LOX LH2
StoichiometricMixtureRatio 0.5
ThermalRocket
ChamberComposition Titanium
ThroatRadius_m 0.8
ChamberWallThickness_m 0.015
ChamberContractionRatio 2
NozzleExpansionRatio 30
NozzleExpansionAngle_degrees 25
RegenerativeCooling_Percent 0.01
Injector
Composition Aluminum
PumpRadius_m 1
RotationalSpeed_RPM 170
Gimbal
InnerRadius_m 1.6
ArmorComposition Amorphous Carbon
ArmorThickness_m 0.0099
MomentumWheels
Composition Calcium
RotationalSpeed_RPM 2900
GimbalAngle_degrees 5
PropellantTankModule 3.50 kt Hydrogen Tank
UsesCustomName false
Propellant Hydrogen
StructureComposition Boron
ReactionMass_kg 3.5e+006
HeightToRadiusRatio 10
AdditionalArmorThickness_m 0
PropellantTankModule 14.0 kt Oxygen Tank
UsesCustomName false
Propellant Oxygen
StructureComposition Boron
ReactionMass_kg 1.4e+007
HeightToRadiusRatio 6
AdditionalArmorThickness_m 0
CrewModule 100 Crew Module
UsesCustomName false
CrewCapacity 100
Decks 17
StructureMaterial Polyethylene
ShellThickness_m 0.018
RadioisotopeThermoelectricGeneratorModule 58.9 kW Radioisotope Thermoelectric Generator
UsesCustomName false
FuelPellet
Fuel Curium-242
Mass_kg 4
Height_m 0.04
Thermocouple
PTypeComposition Tantalum
NTypeComposition Tungsten
Length_m 0.003
ExitTemperature_K 1000
Coolant Sodium
Turbopump
Composition Copper
PumpRadius_m 0.02
RotationalSpeed_RPM 1
RadiatorModule 9x3 Calcium Radiator
UsesCustomName false
Composition Calcium
PanelWidth_m 1.5
Height_m 3
Thickness_m 0.1
ArmorThickness_m 0.001
Panels 6
FrontTaper_radians 0
BackTaper_radians 0
SurfaceFinish Boron
CraftBlueprint Orbiter
Modules
2.89 km/s LOX LH2 Gimballed Combustion Rocket 5 0 null 0
3.50 kt Hydrogen Tank 1 -0.5 null 0
14.0 kt Oxygen Tank 1 69.859 null 0
100 Crew Module 1 140.22 null 0
10.0 m x 0 m Spacer 1 171.89 null 0
58.9 kW Radioisotope Thermoelectric Generator 1 156.05 null 0
9x3 Calcium Radiator 2 140.22 100 Crew Module 0
2x1 Silicon Carbide Radiator 2 90.096 58.9 kW Radioisotope Thermoelectric Generator 0
Armor
ArmorLayers
Polyethylene 0.005 0 0 1 1
Graphite 0.001 0 0 1 1
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Post by The Astronomer on May 8, 2017 3:25:26 GMT
Here's my crack at it. 39.7 Mc, able to take 22 crew, and 78 passengers. Assuming the plastic shell doesn't fall apart or melt on exiting the atmosphere (it's coated in graphite to help) you should be able to get there with 110 m/s to spare. You don't need fancy pants nuclear rockets when the classic OH2 mix works completely fine. CombustionRocketModule 2.89 km/s LOX LH2 Gimballed Combustion Rocket
UsesCustomName false
Reaction LOX LH2
StoichiometricMixtureRatio 0.5
ThermalRocket
ChamberComposition Titanium
ThroatRadius_m 0.8
ChamberWallThickness_m 0.015
ChamberContractionRatio 2
NozzleExpansionRatio 30
NozzleExpansionAngle_degrees 25
RegenerativeCooling_Percent 0.01
Injector
Composition Aluminum
PumpRadius_m 1
RotationalSpeed_RPM 170
Gimbal
InnerRadius_m 1.6
ArmorComposition Amorphous Carbon
ArmorThickness_m 0.0099
MomentumWheels
Composition Calcium
RotationalSpeed_RPM 2900
GimbalAngle_degrees 5
PropellantTankModule 3.50 kt Hydrogen Tank
UsesCustomName false
Propellant Hydrogen
StructureComposition Boron
ReactionMass_kg 3.5e+006
HeightToRadiusRatio 10
AdditionalArmorThickness_m 0
PropellantTankModule 14.0 kt Oxygen Tank
UsesCustomName false
Propellant Oxygen
StructureComposition Boron
ReactionMass_kg 1.4e+007
HeightToRadiusRatio 6
AdditionalArmorThickness_m 0
CrewModule 100 Crew Module
UsesCustomName false
CrewCapacity 100
Decks 17
StructureMaterial Polyethylene
ShellThickness_m 0.018
RadioisotopeThermoelectricGeneratorModule 58.9 kW Radioisotope Thermoelectric Generator
UsesCustomName false
FuelPellet
Fuel Curium-242
Mass_kg 4
Height_m 0.04
Thermocouple
PTypeComposition Tantalum
NTypeComposition Tungsten
Length_m 0.003
ExitTemperature_K 1000
Coolant Sodium
Turbopump
Composition Copper
PumpRadius_m 0.02
RotationalSpeed_RPM 1
RadiatorModule 9x3 Calcium Radiator
UsesCustomName false
Composition Calcium
PanelWidth_m 1.5
Height_m 3
Thickness_m 0.1
ArmorThickness_m 0.001
Panels 6
FrontTaper_radians 0
BackTaper_radians 0
SurfaceFinish Boron
CraftBlueprint Orbiter
Modules
2.89 km/s LOX LH2 Gimballed Combustion Rocket 5 0 null 0
3.50 kt Hydrogen Tank 1 -0.5 null 0
14.0 kt Oxygen Tank 1 69.859 null 0
100 Crew Module 1 140.22 null 0
10.0 m x 0 m Spacer 1 171.89 null 0
58.9 kW Radioisotope Thermoelectric Generator 1 156.05 null 0
9x3 Calcium Radiator 2 140.22 100 Crew Module 0
2x1 Silicon Carbide Radiator 2 90.096 58.9 kW Radioisotope Thermoelectric Generator 0
Armor
ArmorLayers
Polyethylene 0.005 0 0 1 1
Graphite 0.001 0 0 1 1
Notice: That mass.
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Post by AdmiralObvious on May 8, 2017 3:26:53 GMT
Here's my crack at it. 39.7 Mc, able to take 22 crew, and 78 passengers. Assuming the plastic shell doesn't fall apart or melt on exiting the atmosphere (it's coated in graphite to help) you should be able to get there with 110 m/s to spare. You don't need fancy pants nuclear rockets when the classic OH2 mix works completely fine. CombustionRocketModule 2.89 km/s LOX LH2 Gimballed Combustion Rocket
UsesCustomName false
Reaction LOX LH2
StoichiometricMixtureRatio 0.5
ThermalRocket
ChamberComposition Titanium
ThroatRadius_m 0.8
ChamberWallThickness_m 0.015
ChamberContractionRatio 2
NozzleExpansionRatio 30
NozzleExpansionAngle_degrees 25
RegenerativeCooling_Percent 0.01
Injector
Composition Aluminum
PumpRadius_m 1
RotationalSpeed_RPM 170
Gimbal
InnerRadius_m 1.6
ArmorComposition Amorphous Carbon
ArmorThickness_m 0.0099
MomentumWheels
Composition Calcium
RotationalSpeed_RPM 2900
GimbalAngle_degrees 5
PropellantTankModule 3.50 kt Hydrogen Tank
UsesCustomName false
Propellant Hydrogen
StructureComposition Boron
ReactionMass_kg 3.5e+006
HeightToRadiusRatio 10
AdditionalArmorThickness_m 0
PropellantTankModule 14.0 kt Oxygen Tank
UsesCustomName false
Propellant Oxygen
StructureComposition Boron
ReactionMass_kg 1.4e+007
HeightToRadiusRatio 6
AdditionalArmorThickness_m 0
CrewModule 100 Crew Module
UsesCustomName false
CrewCapacity 100
Decks 17
StructureMaterial Polyethylene
ShellThickness_m 0.018
RadioisotopeThermoelectricGeneratorModule 58.9 kW Radioisotope Thermoelectric Generator
UsesCustomName false
FuelPellet
Fuel Curium-242
Mass_kg 4
Height_m 0.04
Thermocouple
PTypeComposition Tantalum
NTypeComposition Tungsten
Length_m 0.003
ExitTemperature_K 1000
Coolant Sodium
Turbopump
Composition Copper
PumpRadius_m 0.02
RotationalSpeed_RPM 1
RadiatorModule 9x3 Calcium Radiator
UsesCustomName false
Composition Calcium
PanelWidth_m 1.5
Height_m 3
Thickness_m 0.1
ArmorThickness_m 0.001
Panels 6
FrontTaper_radians 0
BackTaper_radians 0
SurfaceFinish Boron
CraftBlueprint Orbiter
Modules
2.89 km/s LOX LH2 Gimballed Combustion Rocket 5 0 null 0
3.50 kt Hydrogen Tank 1 -0.5 null 0
14.0 kt Oxygen Tank 1 69.859 null 0
100 Crew Module 1 140.22 null 0
10.0 m x 0 m Spacer 1 171.89 null 0
58.9 kW Radioisotope Thermoelectric Generator 1 156.05 null 0
9x3 Calcium Radiator 2 140.22 100 Crew Module 0
2x1 Silicon Carbide Radiator 2 90.096 58.9 kW Radioisotope Thermoelectric Generator 0
Armor
ArmorLayers
Polyethylene 0.005 0 0 1 1
Graphite 0.001 0 0 1 1
Notice: That mass. True. But it's eco friendly... mostly. More so than the blood based variant I made, since that resource should be readily available right?
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Post by The Astronomer on May 8, 2017 3:42:16 GMT
True. But it's eco friendly... mostly. More so than the blood based variant I made, since that resource should be readily available right? Why am I seeing it blood red???
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