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Sun, Dec 31, 2017

Aero-News: Quote of the Day (12.31.17)

Aero-News: Quote of the Day

ANN's Quote of the Day usually derives from current news, though we reserve the right to pick quotes out of history that have a bearing on the day's events and issues.

Sometimes, you'll find them timely and in keeping with the content of the day's news... and sometimes, they'll just be thought-provoking.

Reader suggestions and comments are welcome... and if particularly intriguing, timely, or poignant, may themselves become future Quotes of the Day.

Let us hear from you, folks!

Aero-News Quote of the Day

“We have two pressurized fuel tanks linked to two pairs of thrusters. Rather than burning propellant, these are simpler ‘cold-gas’ thrusters designed specifically for such a small mission. And simpler means cheaper and smaller. The fuel is stored under pressure, then released through a tiny rocket nozzle. Even though it’s cold gas, we achieve a substantial velocity change by using liquid butane that turns to gas as it exits. Storing it as a liquid, like in a cigarette lighter, allows us to pack as many butane molecules as possible inside the small available volume – its liquid form being some 1000 times denser than its gas.”

Source: Tor-Arne Grönland, head of NanoSpace, describing how ESA’s next miniature satellite will be its first with an ability to change orbit. Thanks to a compact thruster resembling a butane cigarette lighter, the cereal box-sized satellite will fly around its near-twin to test their radio communications. Ready to be launched with its counterpart from China on February 2, GomX-4B is built from six standard 10 cm CubeSat units.

FMI: www.esa.int

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