Unmanned Solar-Powered Aircraft Sets World Record
|Zephyr soars to new world records on solar power.|
QinetiQ announced that Zephyr, the leading solar powered high-altitude long-endurance (HALE) Unmanned Air System (UAS) has flown for more than a week, smashing a number of long-standing world records.
Flying high above the US Army’s Yuma Proving Ground in Arizona, as of July 16, 2010, Zephyr had already passed the seven day / 168 hour mark and the clock was still running. This doubles the unofficial world record for longest duration unmanned flight of 82 hours, 37 minutes set in 2008 and already held by Zephyr, and is well in excess of the current official world record of 30 hours 24 minutes set by Northrop Grumman’s RQ-4A Global Hawk on 22 March 2001.
As a bold statement of intent QinetiQ invited the Federation Aeronautique Internationale (FAI), the world air sports federation, to oversee the flight and an FAI Official monitored progress at the Yuma Proving Ground. Zephyr’s world records will not become official until the aircraft is safely back on the ground.
The current goal is to fly for a further week and prove Zephyr is the world’s first truly eternal plane, capable of providing a low-cost, persistent surveillance capability over months rather than days. Potential applications include earth observation and communications relay in support of a range of defence, security, and commercial requirements.
The current Zephyr aircraft is a genuine breakthrough design, drawing on the latest technology and represents a massive leap forward in engineering excellence incorporating an entirely new wing design.
“The team has worked tirelessly over the past few years, making truly significant leaps forward in overall design and construction – and to see it successfully soar into the sky was fantastic,” explained Jon Saltmarsh, Zephyr Programme Director. “By being able to remain over a location for weeks or months at a time, it can usefully deliver a host of practical and more affordable solutions to both civil and military customers.”
Launched by hand, the aircraft flies by day on solar power delivered by amorphous silicon solar arrays no thicker than sheets of paper that cover the aircraft’s wings. These are also used to recharge the lithium-sulphur batteries, supplied by Sion Power Inc, which are used to power the aircraft by night. Together they provide an extremely high power to weight ratio on a continuous day/night cycle, thereby delivering persistent on-station capabilities.
Around 50% larger than the previous Zephyr, technical changes now mean it has a 22.5 meter wingspan to accommodate more batteries that are combined with a totally new integrated power management system. The entirely new aerodynamic shape and high “T” tail also contribute to reduce drag and improve performance. The payload capacity will meet a number of key surveillance and communication requirements already demonstrated by Zephyr over the past three years. Zephyr’s ultra-lightweight carbon-fibre design also means it weighs in at just over 50 kilograms.
Unlike conventional manned or unmanned aircraft now being operated, Zephyr does not need to return to base at regular intervals for re-fueling or servicing which also helps minimize the logistical supply chain and extend its operational capability.