Record Solar Powered Flight

UK-built solar-powered plane has set an unofficial world endurance record for a flight by an unmanned aircraft.

The Zephyr-6, as it is known, stayed aloft for more than three days, running through the night on batteries it had recharged in sunlight.

The flight was a demonstration for the US military, which is looking for new types of technology to support its troops on the ground.

Craft like Zephyr might make ideal platforms for reconnaissance.

They could also be used to relay battlefield communications.

Chris Kelleher, from UK defence and research firm QinetiQ, said Unmanned Aerial Vehicles (UAVs) offer advantages over traditional aircraft and even satellites.

"The principal advantage is persistence - that you would be there all the time," he told BBC News. "A satellite goes over the same part of the Earth twice a day - and one of those is at night - so it's only really getting a snapshot of activity. Zephyr would be watching all day."

The latest flight was conducted at the US Army's Yuma Proving Ground in Arizona.

The Zephyr flew non-stop for 82 hours, 37 minutes.

That time beats the current official world record for unmanned flight set by the US robot plane Global Hawk - of 30 hours, 24 minutes - and even Zephyr's own previous best of 54 hours achieved last year.

However, the Yuma mark remains "unofficial" because QinetiQ did not involve the FAI (Federation Aeronautique Internationale), the world air sports federation, which sanctions all record attempts.

The US Department of Defense funded the demonstration flight under its Joint Capability Technology Demonstration (JCTD) programme.

The 30kg Zephyr was guided by remote control to an operating altitude in excess of 18km (60,000ft), and then flown on autopilot and via satellite communication.

It tested a communications payload weighing approximately 2kg.

At first sight, the propeller-driven Zephyr looks to be just another model aircraft, and it is even launched by hand. But this "pilotless" vehicle with its 18-metre wingspan incorporates world-leading technologies.

Its structure uses ultra-lightweight carbon-fibre material; and the plane flies on solar power generated by amorphous silicon solar arrays no thicker than sheets of paper. These are glued over the aircraft's wings.

To get through the night, the propellers are powered from lithium-sulphur batteries which are topped up during the day.

"A lot of effort has gone into power storage and light-weighting the systems," explained Mr Kelleher. "Lithium sulphur is more than double the energy density of the best alternative technology which is lithium polymer batteries.

The engineers from the Farnborough-based company are now collaborating with the American aerospace giant Boeing on a defence project codenamed Vulture.

This would see the biggest plane in history take to the sky, powered by the sun and capable of carrying a 450-kilo (1,000lb) payload.

US commanders say the design must be able to maintain its position over a particular spot on the Earth's surface uninterrupted for five years.

QinetiQ is the public company that used to be the British Government's military research department, before they privatised it.

BBC article

QinetiQ's page on Zephyr

Picture of Record Solar Powered Flight
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jay_9898 years ago
woooooo goooooo UK, i live near the place where they developed the Zephyr (QinetiQ)
=SMART=9 years ago
Yay UK !!
Things like this could actually be used for communications purposes very easily, like a cheaper and altogether simpler version of satellites, granted they'd have to be very carefully planned considering the worlds air traffic...
Kiteman (author)  killerjackalope9 years ago
It's actually designed well above most air traffic.

I think the "Vulture" project is supposed to fulfil the satellite slot you suggest.
Well it seems wasteful when you can have much more reliable coverage at a lesser cost, one satellite connection lost by a station and GPS for a third of the world could be down...
The GPS systems are redundant many times over. Many, many times. There is a lot riding on them.

I should point out that it is a constellation of satellites that rotate across the sky constantly. In other words, the GPS satellites are NOT geosynchronous. There are currently 31 sattelites whizzing around the world. You only need three or four satellites within "view" and decent reception to find where you are.

If you care to learn more (possibly bore yourself to death) check out Wikipedia's GPS article
It was more of an example I had chosen poorly, granted it only takes three satellites placed at the right points to cover the whole world effectively, I assume two isn't possible because there isn't an easy way to maintain orbit at that distance... I suppose the reason the GPS is designed that way is that there would be a tremendous load on them to transmit a signal that strong to be effective and it would put them in a position of no redundancy were something to happen.
Kiteman (author)  killerjackalope9 years ago
GPS has to be satellite based, their fixed relative positions is what make it work.

I predict smaller countries using this class of plane instead of satellites for monitoring their own countries - (Columbia, for instance has only a single dead CubeSat in space).

Imagine the benefit of monitoring logging on a minute-by minute basis, instead of once a year. Or getting proper phone signals to people in deep valleys or distant jungles.
Derin Kiteman9 years ago
Turkey only has one sat and its on rent from France!too bad its a tv satellite,google turksat
Kiteman (author)  Derin9 years ago
(Doesn't Turkey have lots of awkward mountains?) Sounds like this plane is just what Turkey needs, then!
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