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http://www.chemnet.com   Apr 30,2015 PRW
The Raven Aerostar division of US-based Ravenstar Industries has been partnering with Nasa on the design of stratospheric balloons for more than 20 years.

In their latest effort, Nasa launched a super pressure balloon late last month carrying a two-and-half ton payload from the mid-latitudes in Wanaka, New Zealand. It was still flying this week and the test flight continues.

“Raven Aerostar is doing what has never been done before,” said Lon Stroschein, the company's vice president and general manager, in a statement. “Putting a balloon in orbit with persistent altitude over a long duration changes everything previously understood about access to space – especially cost-per-flight-hour.”

According to Aerostar’s website, the super pressure balloons are pressurised day and night and can rise up to 130,000 feet, or 40,000 metres, above sea level. They are built with a special formulation of polyethylene film that can withstand temperatures as cold as -80° Celsius.

Aerostar personnel were onsite for the launch, providing support to Orbital ATK, the prime contractor of the Nasa balloon programme. It lifted to the stratosphere at a rate of 305 metres per minute.

In volume terms the balloon exceeds 510 million cubic metres in volume, which is similar in size to a sports stadium. It is designed to maintain a constant float altitude at 34,000 metres to conserve helium and increase flight endurance.

“This mission is already considered a huge success at Nasa,” said Deborah Fairbrother, the agency’s balloon programme office chief, in a statement.

Aerostar said the balloon project required the highest level of quality standards throughout its manufacturing because it cannot be fully tested prior to its maiden flight.
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