Rocket to Launch Inflatable Re-entry Capsule

August 14, 2009
NASA engineers check out the Inflatable Re-entry Vehicle Experiment (IRVE) in the lab. Credit: NASA/Sean Smith

(PhysOrg.com) -- Inflatable aircraft are not a new idea. Hot air balloons have been around for more than two centuries and blimps are a common sight over many sports stadiums. But it's hard to imagine an inflatable spacecraft.

Researchers from NASA's Langley Research Center in Hampton, Va., are working to develop a new kind of lightweight inflatable spacecraft outer shell to slow and protect reentry vehicles as they blaze through the atmosphere at hypersonic speeds.

They will test a technology demonstrator from a small sounding to be launched at NASA's Wallops Flight Facility at Wallops Island, Va. The launch is scheduled for Aug. 17.

The Inflatable Re-entry Vehicle Experiment, or IRVE, looks like a giant mushroom when it's inflated. For the test, the silicon-coated Kevlar aeroshell is vacuum-packed inside a 16-inch (40.6 cm) diameter cylinder, but once it unfurls and is pumped full of nitrogen it is almost 10 feet (3 m) wide.

Engineers say the concept could help land bigger objects on Mars. "We'd like to be able to land more mass on Mars," said Neil Cheatwood, IRVE's principal investigator and chief scientist of the Hypersonics Project within NASA's Fundamental Aeronautics Program. "To land more mass you have to have more drag. We need to maximize the drag area of the entry system. We want to make it as big as we can, but the limitation has been the diameter."

According to Cheatwood, the idea of inflatable decelerators has been around for 40 years, but there were technical issues, including concerns about whether materials could withstand the heat of re-entry. Since then materials have advanced and because of numerous Mars missions, including rovers, landers and orbiters, there's more understanding of the Martian atmosphere.

That means researchers can now test a subscale model of a compact inflatable heat shield with the help of a small two-stage rocket. The vehicle is a 50-foot Black Brant 9 that will lift IRVE outside the atmosphere to an altitude of about 130 miles (209 km). Engineers want to find out what the re-entry vehicle will do on the way down.

"The whole flight will be over in less than 20 minutes," said Mary Beth Wusk, IRVE project manager. "We separate from the rocket 90 seconds after launch and we begin inflation about three-and-a-half-minutes after that. Our critical data period after it inflates and re-enters through the atmosphere is only about 30 seconds long."

Cameras and sensors on board will document the inflation and high-speed free fall and send information to researchers on the ground.

After its brief flight IRVE will fall into the Atlantic Ocean about 90 miles down range from Wallops. No efforts will be made to retrieve the experiment or the sounding rocket.

The Inflatable Re-entry Vehicle Experiment is an example of how NASA is using its aeronautics expertise to support the development of future spacecraft. NASA's Aeronautics Research Mission Directorate in Washington funded the flight experiment as part of its hypersonics research effort.

On the day of the launch the Wallops Flight facility plans to use the Internet to update the countdown status at: twitter.com/NASA_Wallops

Provided by JPL/ (news : web)

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Ant
not rated yet Aug 14, 2009
Isnt the difference in atmospheric weight between earth and say mars going to provide an unknown in the inflatable expansion were this to be used in the future?
spacester
5 / 5 (2) Aug 15, 2009
Isnt the difference in atmospheric weight between earth and say mars going to provide an unknown in the inflatable expansion were this to be used in the future?


I'm not sure what you mean by 'atmospheric weight'.

The 'inflatable expansion' takes place in a vacuum. So the craft itself is the same at both planets.

The atmospheres of Mars and Earth are very different. Mars' is thin but extends a lot further from the surface. We now know a lot about the Martian atmosphere (FTA), so I don't see a major unknown here that would prevent them from using the results of this experiment to help design a Mars entry craft based on the technology.

One thing we know about the Martian atmosphere is that, being thin, it is highly variable. Future craft will likely be making last-minute adjustments based on the latest weather report.

One other thing should be noted: all vehicles to date that have plunged into the Martian atmosphere have done so without slowing down first to get into Martian orbit. Entry velocities, and thus heating rate, would go down substantially if you are de-orbiting.

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