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Aerospace Testing InternationalAerospace Testing International
Space

Casting the net further than ever before

Anthony JamesBy Anthony James27th March 20152 Mins Read
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One of humanity’s oldest technologies, the humble fishing net, may yet find a new role in space: bringing down dead satellites.

The behavior of nets in orbit was recently tested on an aircraft flying parabolic arcs to create brief periods of weightlessness.

“We shot nets out of a compressed air ejector at a scale-model satellite,” explained ESA engineer Kjetil Wormnes. We fired 20 nets at various speeds during 21 parabolas over two days. Packed inside paper cartons, the nets were weighted at each corner, helping them to entangle the model satellite. The good news is they worked extremely well – so much so that the nets usually had to be cut away with a knife before we could shoot again.”

The Falcon 20 aircraft is flown so that for 20 seconds at a time it falls through the sky, effectively canceling out gravity inside the aircraft.

“Everything was recorded on four high-speed HD cameras,” Kjetil added. “The aim is to check the simulation tool we have developed, so that we can use it to design the full-size nets for a debris removal mission.”

The rainbow-hued nets were designed to be easily followed on camera. Of the two variants used, the thinner spun versions proved more effective than the thicker, woven design.

ESA’s e.Deorbit mission in 2021 will test the feasibility of removing a large item of debris – either a large derelict satellite or rocket upper stage – to help control the debris levels in busy orbits.

The best method of snagging an uncontrolled, tumbling satellite is still being decided. ESA’s Clean Space initiative to reduce the impact of the space industry on the terrestrial and orbital environments is overseeing studies that also include a robotic arm, a harpoon and an ion beam.

To see the film, click on video on the homepage 

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