Realistic fast Interstellar Propulsion Methods

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SUMMARY

The discussion centers on the challenges of achieving realistic interstellar propulsion methods for a Hard-Sci Fi novel, specifically targeting a journey to a nearby star system approximately 4 light-years away within a timeframe of 24 months. The author explores various propulsion concepts, including particle accelerator-based systems and fusion engines, but concludes that none can achieve the desired velocity of 0.5c without violating thermodynamic principles. Key issues identified include excessive heating, inefficiency, and the impracticality of current technologies, leading to travel times in the range of tens of thousands of years.

PREREQUISITES
  • Understanding of thermodynamics and its implications on propulsion systems
  • Familiarity with particle accelerator technology, specifically Wakefield accelerators
  • Knowledge of fusion propulsion concepts and their limitations
  • Basic grasp of the rocket equation and mass-energy conversion
NEXT STEPS
  • Research advanced propulsion concepts like the BIS 'Daedalus' approach using pulsed fusion
  • Investigate the feasibility of using antimatter propulsion systems
  • Explore the concept of fusion highways and their potential for interstellar travel
  • Study the efficiency metrics of current particle accelerators and their applications in propulsion
USEFUL FOR

Science fiction writers, aerospace engineers, and physicists interested in the theoretical and practical challenges of interstellar travel and propulsion technologies.

  • #61
Drakkith said:
... REALLY big fuel tank...

... your five-million metric ton spacecraft ...

This measure of "big" is disappointing IMO. If your puny economy ride was parked by Neptune L5 it would need to be 50 km just to be detectable. Need to up that by 5 to 7 orders of magnitude
 
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  • #62
I've probably mentioned this before but the most "realistic" option we have now seems to be Dr. Zubrin's Nuclear Salt Water Rocket.

To quote Atomic Rockets:

"[...]. Zubrin then goes on to speculate about a more advanced version of the NSWR, suitable for insterstellar travel. Say that the 2% uranium bromide solution used uranium enriched to 90% U235 instead of only 20%. Assume that the fission yield was 90% instead of 0.1%. And assume a nozzle efficency of 0.9 instead of 0.8.

That would result in an exhaust velocity of a whopping 4,725,000 m/s (about 1.575% c, a specific impulse of 482,140 seconds). In a ship with a mass ratio of 10, it would have a delta V of 3.63% c. Now you're talkin..."

Also Wiki on the NSWR.
 
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