Repro vs Daedalus

REPRO is a self-replicating starprobe design, based on the British Interplanetary Society’s “Daedalus” starprobe design, and developed by Robert Freitas c.1980. Massing over 10,700,000 tons because of the propellant needed to deccelerate from 12% lightspeed, the REPRO arrives in a system, scouts out a suitable moon/asteroid and proceeds to build a self-replicating FACTORY which builds up the infrarstructure over 1,000 years to make a new REPRO. No mean feat for a computer system estimated to store 1014 bits and massing 7 tons [!] These days Freitas is at the cutting edge of nanotechnology and nanomedicine. His latest probe designs might mass 1 kilogram.


Estimated Mass of
Starprobe Components
Starship Component  Daedalus REPRO
Component Mass (kg) Component Mass (kg)
PROPULSION SYSTEM
1.54x106
1.43x108
0th Stage
1.40x108
Reaction Chamber(s)
4.22x107
Excitation Field Coils
8.51x106
Titanium Coil Supports
1.56x107
Ignition Assembly
2.61x107
Charging Circuit Supports
1.70x106
Pellet Injector
Capacitors
2.04x107
Aluminium Superconducting Coils
2.69x104
Uncommitted Mass (V.O.)
2.56x107
1st Stage
1.23x106
2.46x106
Reaction Chamber(s)
2.19x105
4.37x105
Excitation Field Coils
1.25x105
2.49x105
Titanium Coil Supports
2.41x105
4.82x105
Ignition Assembly
3.07x105
6.14x105
Charging Circuit Supports
2.10x104
4.20x104
Pellet Injector
Capacitors
2.96x104
5.96x104
Aluminium Superconducting Coils
3.66x101
7.32x101
Uncommitted Mass (V.O.)
2.87x105
5.74x105
2nd Stage
3.15x105
6.30x105
Reaction Chamber(s) 
2.21x104
4.42x104
Excitation Field Coils 
4.36x104
8.72x104
Titanium Coil Supports
9.06x104
1.81x105
Ignition Assembly 
8.10x104
1.62x105
Charging Circuit Supports
5.90x103
1.18x104
Pellet Injector
Capacitors
7.90x102
1.58x103
Aluminium Superconducting Coils
9.05x10-1
1.81x100
Uncommitted Mass (V.O.)
7.08x104
1.42x105
THRUST STRUCTURE
7.50x104
2.81x106
0th Stage
2.66x106
1st Stage
5.00x104
1.00x105
2nd Stage
2.50x104
5.00x104
SERVICE BAY
8.91x105
1.10x108
0th Stage
1.08x108
Core
9.47x107
Thermal Shielding
Gold
1.19x105
Rhodium
5.89x105
Iconel Base
4.28x106
Power Supplies
Buffer Capacitors
5.85x106
Nuclear Reactors (V.O.)
2.74x106
1st Stage
7.59x105
1.52x106
Core
6.45x105
1.29x106
Thermal Shielding
Gold
5.78x102
1.16x103
Rhodium
2.89x103
5.78x103
Iconel Base
2.00x103
4.00x103
Power Supplies
Buffer Capacitors
3.00x104
6.00x104
Nuclear Reactors (V.O.)
6.00x104
1.20x105
2nd Stage
Core
1.32x105
2.64x105
Thermal Shielding
Gold
5.51x101
1.10x102
Rhodium
2.75x102
5.50x102
Iconel Base
2.00x103
4.00x103
Power Supplies
Buffer Capacitors
3.00x103
6.00x103
Nuclear Reactors (V.O.)
3.80x104
7.60x104
PROPELLANT SYSTEM
0th Stage
1.03x1010
Helium-3 Fuel
6.00x109
Deuterium Fuel
4.00x109
Insulation
Fuel Tanks
1.46x106
LH2 Tanks
1.54x104
Fuel Tanks
2.12x107
Uncommitted Mass (V.O.)
2.75x108
1st Stage
4.74x107
9.49x107
Helium-3 Fuel
2.76x107
5.52x107
Deuterium Fuel
1.84x107
3.68x107
Insulation
Fuel Tanks
3.15x104
6.30x104
LH2 Tanks
4.07x102
8.14x102
Fuel Tanks
9.85x104
1.97x105
Uncommitted Mass (V.O.)
1.30x106
2.60x106
2nd Stage
Helium-3 Fuel
2.45x106
4.90x106
Deuterium Fuel
1.63x106
3.26x106
Insulation
Fuel Tanks
1.95x104
3.91x104
Maneuver Tanks
4.60x102
9.20x102
LH2 Tanks
3.60x102
7.20x102
Fuel Tanks
8.87x103
1.77x104
Uncommitted Mass (V.O.)
1.19x105
2.38x105
PAYLOAD BAY
5.07x105
1.00x106
Committed Bay Structure
5.00x104
7.50x104
Sensing and Communications (V.O.)
1.10x105
1.0x105
Subprobes(V.O.)
2.45x105
1.00x105
Service Wardens (V.O.)
4.50x104
2.25x105
Shield Cloud (V.O.)
5.00x103
5.00x103
Dust Bugs (V.O.)
2.00x103
2.00x103
Beryllium Payload Shield
5.00x104
5.00x104
SEED (F.O.)
4.43x105
TOTAL MASS ESTIMATE
5.45x107
1.07x1010

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