Saturday, August 30, 2014


Interplanetary flights will become routine
(much like airline travel today)
because travel time will become reasonable.

Furthermore, spacecraft will maintain comfortable Earthlike conditions (gravity, atmosphere, comfortable billets, entertainment, etc) throughout the flight.
Consider Einstein's thought experiment about an accelerating elevator. If the elevator accelerates at same rate as free falling objects near Earth's surface, then occupants will feel same g-force as if they're static on Earth's surface. (Einstein called this "equivalence".)
Instead of Einstein's elevator, our thought experiment notionalizes a high performance spaceship to accelerate at rate, g, to produce gravity like force (g-force). A g-force trip to nearby planets will take days or weeks (orbiting vehicles now take years). We speculate that g-force propulsion can be accomplished with well known science and slight advances in current technology.


Introduction: Thinking About It.

1. ACCELERATE FOR A DAY: Consider Einstein's famous "Thought Experiment" which states the equivalence between being static on Earth's surface or traveling at 1 g acceleration; it feels the same. Acceleration due to Earth surface gravity, g, about 10 m/sec². This value can be expressed as an equivalent daily rate, g = .5 AU/day².
2. ACCELERATE TO THE PLANETS: G-force to the planets in days, because G-force acceleration greatly increases ship's velocity. However, the ship must reverse propulsion vector at midpoint to SLOWDOWN throughout the second half of trip at g-force deceleration.
3. MOMENTUM MAKES IT HAPPEN: High speed fuel particles propel a space vessel via a rocket like momentum exchange. If exhaust particle speed approaches light speed; then, relativistic masses gain increases momentum to further enhance propulsion.
4. MASS TO MOTION: On board particle accelerators can drive exhaust particles to enormous speeds with enormous momentum to drive spaceships. Resulting mass consumption can be expressed as percentage of take off gross weight (%TOGW) per day.
5. PUSH PARTICLES TO INTERPLANETARY. Particle exhaust speeds from .1c to .5c will adequately transport people, cargo and habitats to the planets inside the KB.
6. CURRENT TECHNOLOGY: ION THRUSTER.  Closest current tech to accelerator drive is "Ion Thruster".  Could be incorporated as an "injector".
7. PROFILE TO THE PLANETS: G-force can propel vessel in straight line to destination. However, flight profile must be carefully planned and executed. Plasma particles can be accelerated to very high, relativistic speeds; resultant momentum imparts g-force and very high speeds to the vessel.
8. G-FORCE TO MARS: Water can get us to our red neighbor quickly.
9. FINITE RANGE: Given a fuel consumption rate, logarithms can quickly approximate a g-force vessel's range.
10.  ACCELERATORS IN SPACE: Let particle accelerators propel g-force vessels.

11. G-FORCE ELEVATORS: BEAM ME UP quickly move pax/cargo from Earth's Equator to Geographic Equatorial Orbit (GEO) Node without the absurdly long tether.
12. TO URANUS.. Why go?? Helium-3, an isotope of Helium, can produce cheaper, cleaner fuel for onboard power needs for space faring enterprises. He-3 is plentiful on the Gas Giants; with the lowest escape velocity, mining HE-3 from Uranus might prove fruitful.
13. KEEPERS FROM KUIPER Space communities will eventually depend on raw materials from space. Kuiper Belt has plenty.
14. SUPER G-FORCE Can interplanetary cargo travel quicker than passengers at g-force? Yes, less time, more fuel, but it may be worth it.
15. EXTRAPLANETARY: Prep for the Stars. Transition to interstellar.
Eventually, interplanetary flights will become routine. When they do, the practicality of interstellar flights will become imminent. "Going Asteroidal" (leveraging asteroids for traveling and dwelling) will be an integral part of both interplanetary and interstellar travel.



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