Powdered Regolith Propulsion

Wouldn't it be handy if you found a way to move your spacecraft using stuff that you found in space? Rather than needing to lift everything up from Earth's deep gravity well?

This tweet references an earlier article from The Space Review on using powdered dust found on objects throughout the solar system.

Electrostatic propulsion is the method used by many deep space probes currently in operation such as the Dawn spacecraft presently wending its way towards the asteroid Ceres. For that probe and several others, xenon gas is ionized and then electrical potential is used to accelerate the ions until they exit the engine at exhaust velocities of 15–50 kilometers per second, much higher than for chemical rocket engines, at which point the exhaust is electrically neutralized. This method produces very low thrust and is not suitable for takeoff from planets or moons.

However, in deep space and integrated over long periods of engine operation time, the gentle push of an ion engine can impart a very significant velocity change to a spacecraft, and do so extremely efficiently: for the Deep Space 1 spacecraft, the ion engine imparted 4.3 kilometers per second of velocity change (delta-v), using only 74 kilograms of propellant to do so. As of late September, Dawn’s ion thrusters have produced 10.2 kilometers per second of delta-v, using 367 kilograms of xenon...

Chemical rockets achieve their large thrust with high mass consumption rate (dm/dt) but low exhaust velocity; therefore, a large fraction of their total mass is fuel. Present day ion thrusters are characterized by high exhaust velocity, but low dm/dt; thus, they are inherently low thrust devices. However, their high exhaust velocity is poorly matched to typical mission requirements and therefore, wastes energy. A better match would be intermediate between the two forms of propulsion. This could be achieved by electrostatically accelerating solid powder grains.

Imagine a vehicle that is accelerated to escape velocity by a conventional rocket. It then uses some powder lifted from Earth for deep-space propulsion to make its way to a NEO, where it lands, collects a large amount of already-fractured regolith, and then takes off again. It is already known that larger NEOs such as Itokawa have extensive regolith blankets.

After leaving the NEO, onboard crushers and grinders convert small amounts of the regolith to very fine powder. (These processes would be perfected in low Earth orbit using regolith simulant long before the first asteroid mission.) Electrostatic grids accelerate and expel the powder at high exit velocities.

(Via Powering cislunar spaceflight with NEO powder)

Science fiction writers have long speculated on the use of what Jack Williamson called positive ray propulsion in his 1931 classic The Prince of Space:

These mammoth vacuum tubes, operated at enormous voltages from vitalium batteries, were little different in principle from the "canal ray" apparatus of some centuries before. Their "positive rays," or streams of atoms which had lost one or more electrons, served to drive the sunship by reaction—by the well-known principle of the rocket motor.

As Winchell Chung of Project Rho points out, Arthur C. Clarke described a finely divided dust propellant, that is, powdered lunar regolith:

The liners that plied from world to world obtained all their propellant mass here, filling their great tanks with the finely divided dust which the ionic rockets would spit out in electrified jets. By obtaining that dust from the Moon and not having to lift it through the enormous gravity field of Earth, it had been possible to reduce the cost of space-travel more than ten-fold.

Be sure to read his page on torchships, which provides a comparison between ion-drive spacecraft which have spit out economical streams of propellant mass, and "honest-to-Heinlein torchships" which don't spare the horsepower.

Scroll down for more stories in the same category. (Story submitted 7/1/2020)

Follow this kind of news @Technovelgy.

| Email | RSS | Blog It | Stumble | del.icio.us | Digg | Reddit |

Would you like to contribute a story tip? It's easy:
Get the URL of the story, and the related sf author, and add it here.

Comment/Join discussion ( 0 )

Related News Stories - (" Space Tech ")

Mercury Capsule Ablative Shielding
'...a synthetic which air-friction would erode away.' - Doc Smith, 1934.

Heinlein And Russian Quail In Orbit
'No earth-hatched bird can learn to fly in that fashion...' - Robert Heinlein, 1942.

Space Construction Tools For Large Structures By OAC
'Mass-produced in the orbiting factories...'

Comercial Airlock 'Bishop' Now On ISS
'They put the bones and the glass can that had contained the soup into the double-doored partition or vestibule...' - John Jacob Astor IV, 1894.

 

Google
  Web TechNovelgy.com   

Technovelgy (that's tech-novel-gee!) is devoted to the creative science inventions and ideas of sf authors. Look for the Invention Category that interests you, the Glossary, the Invention Timeline, or see what's New.

 

 

 

 

 

Current News

Nuclear Batteries May Pack Inner Punch
'... the most super-valuable substance in the solar system.'

Elon Musk STILL Wants To Make Heinlein's 1940's Speedster
'As she neared the barrier the car surged and lifted...'

Mercury Capsule Ablative Shielding
'...a synthetic which air-friction would erode away.'

Heinlein And Russian Quail In Orbit
'No earth-hatched bird can learn to fly in that fashion...'

Listen Up, Coppertop - Wearable Device Turns You Into A Battery
'It's our way or the highway.'

Solar Powered Robot Cleans Up Solar Panels For Free
'... with large padded feet, who were apparently polishing their way the whole length of Rama's six artificial suns.'

Spot Arm From Boston Dynamics Picks Up Like Heinlein's Hired Girl Robot
'Anything larger than a BB shot it picked up and placed in a tray on its upper surface...'

Electric Vehicle Prices Will Drop To $2,890
'the human seats took up two-thirds of the room in each'

TIGER Ultimate Mobility Vehicle From Hyundai
'He admired the fast-plodding, articulated legs...'

Drones Communicate With Each Other Using Quantum Encryption
'the curious absent look of a robot talking on the TBR circuits...'

Space Construction Tools For Large Structures By OAC
'Mass-produced in the orbiting factories...'

SpinCare Electrospins And Shoots Wound Dressing
'Over her lacerated right shoulder he sprayed art-derm...'

Tesla Model S And X Moves Toward KITT Knight Rider Styling
Now, that was a Pontiac Trans Am with some real style.

Sophia Robots By The Thousands
'There is a built-in microphone that hears everything you say, and an electric brain that selects a suitable answer.'

Scaly-Foot Snail Works With Iron
'Micro-Scale suit tiles fabricated by genetically engineered metal affinity bacteria...'

Updated Piaggio Gita Personal Robot Porter
'Carry his bag... and follow him faithfully...'

More SF in the News Stories

More Beyond Technovelgy science news stories

Home | Glossary | Invention Timeline | Category | New | Contact Us | FAQ | Advertise |
Technovelgy.com - where science meets fiction™

Copyright© Technovelgy LLC; all rights reserved.