Saturday 10 December 2016

Flying a kite to Venus 10 times faster than a rocket

Julian Ryall in Tokyo

Published 17/05/2010 | 05:00

Japan will launch the world's first spacecraft on Tuesday that draws its energy from a huge solar-powered sail.

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Ikaros -- which stands for Interplanetary Kite-Craft Accelerated by Radiation of the Sun -- works on the same principle as a yacht, according to the Japan Aerospace Exploration Agency.

It will be launched from the island of Tanegashima aboard an H-IIA rocket before unfurling its ultra-thin membrane "sail" -- half the thickness of a human hair -- once it is in space.

Solar particles emitted by the sun will hit the 66ft sail to propel it through space towards Venus.

Photons bounce off thousands of tiny mirrors to push it through the resistance-free environment.

Mission

And as the force acts continuously, a solar sail will eventually be able to reach speeds that are up to 10 times greater than any rocket powered by conventional chemicals.

The 307kg craft also has engines that draw their energy from solar cells and act as a hybrid engine, primarily for steering it on its mission.

Yuichi Tsuda, deputy manager for the project, said: "We believe Ikaros will take six months to reach Venus, which we will use to test the craft and its responses

"But after that we want it continue to fly for as long and as far as possible."

The team hopes to be able to operate the vehicle for at least one year, after which they expect to lose contact with it.

Plans are already under way for its successor which will be launched towards the end of the decade and be equipped with a solar power sail with a diameter of 160ft.

Design

The idea for this form of propulsion has been around since Lithuanian scientist Fredrich Tsander proposed it in the early 1920s, although the design required is far more recent, dating from the early 1990s.

The technology is widely considered to be a crucial factor for space travel in the future, with laser light replacing sunlight as the ultimate aim. (©The Daily Telegraph)

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