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"What I have in my stories is ethics. Ethics and morality are very different cups of tea. I adhere to a very strict rigor of personal ethics and I demand it of those around me as well."
- Harlan Ellison

Lyle Drive  
  Propulsion system for use inside the solar system.  

The Federation Ship Champion, manned by an all-male crew of eighteen experienced spacemen and carrying more than that number of male pioneers, made the crossing under Lyle Drive in only nineteen days. The Champion landed just south of Lacus Soli, as Captain van Tromp intended to search for the Envoy.
Technovelgy from Stranger in a Strange Land, by Robert Heinlein.
Published by Putnam in 1961
Additional resources -

Heinlein does not provide a description of how this propulsion system works (at some point, the Champion is described as "floating silently and effortlessly upward" from the surface of Mars); however, he compares it to the method still in use today:

At that time, only eight Terran years after the founding of the first human colony on Luna, any interplanetary trip made by humans necessarily had to be made in weary free-fail orbits, doubly tangent semi-ellipses--from Terra to Mars, two hundred fifty-eight days, the same for the return journey, plus four hundred fifty-five days waiting at Mars while the two planets crawled slowly back into relative positions which would permit shaping the doubly-tangent orbit-a total of almost three Earth years.

An earlier description of this notion can be found in The First Martian (1932) by Eando Binder:

The inconceivable distance to be traversed, the enormous energy required to transport a heavy machine from planet to planet, and the all-powerful force of gravity, seemed insurmountable objects to even the most broadminded and optimistic thinkers. Feeble attempts were made even in 1931 to leave this speck of the universe and soar to other worlds, but constant failures dulled the ardor of those who wished to connect our world with the others which acknowledge the same central sun... Although the fatalities far exceeded these probable successes, the hope of interplanetary travel was still uppermost in our minds. We know now, that our failure can be attributed to the unfortunate lack of radioactive elements, and not to the lack of ingenuity or inventiveness. It was only too true. as Professor Billings stated in 1945, that the only type of engine which could possibly transport a heavy machine from our earth to some planet, would have to be the atomic-energy engine, which, with a minimum of fuel and the very necessary radioactive element, could develop an unlimited amount of energy.

He even drew plans of the basic principles of such an engine, estimated the amount of radioactive material needed, and worked out the propulsion of the ship.

Compare to these propulsion systems: Light Pressure Propulsion (1867), apergy (1880), Beam-Powered Propulsion (1931), Granton motor (1933), Vibration-Propelled Cruiser (1928), geodynes (1936), ion drive (1947), Planetary Propulsion-Blasts (1934), stardrive (1953), solar sail (light sail) (1962), Lyle drive (1961), laser cannon (1966), Bussard ramjet (1976), asymptotic drive (1976), Interstellar Laser Propulsion System (1985).

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Additional resources:
  More Ideas and Technology from Stranger in a Strange Land
  More Ideas and Technology by Robert Heinlein
  Tech news articles related to Stranger in a Strange Land
  Tech news articles related to works by Robert Heinlein

Lyle Drive-related news articles:
  - 30-Day Trip To Mars?
  - Nuclear Rockets To Fly In Space!

Articles related to Space Tech
FLOAT Levitating Train On The Moon ala Clarke
SpaceX Intros Extravehicular Activity Suit
SpaceX Wants A Moonbase Alpha
NASA Wants Self-Driving Or Remote-Controlled Vehicles For Lunar Astronauts

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