Skydiver Felix Baumgartner set to break sound barrier

Felix Baumgartner Two high altitude jumps earlier this year were used to test all the equipment

Related Stories

The Austrian skydiver Felix Baumgartner will attempt to become the first human to break the sound barrier unaided by a vehicle.

He is going to jump out of a balloon at more than 120,000ft (36.5km) above Roswell, New Mexico.

In the near vacuum at that altitude, he should accelerate beyond about 690mph (1,110km/h) within 40 seconds.

If all goes well, he will open a parachute near the ground to land softly in the desert, 10 minutes later.

The 43-year-old adventurer - famous for jumping off skyscrapers - is under no illusions about the dangers he faces.

Start Quote

When you're standing there in a pressure suit, the only thing that you hear is yourself breathing”

End Quote Felix Baumgartner

Where he is going, the air pressure is less than 2% of what it is at sea level, and it is impossible to breathe without an oxygen supply.

Others who have tried to break the existing records for the highest, fastest and longest freefalls have lost their lives in the process.

"If something goes wrong, the only thing that might help you is God," says Baumgartner.

"Because if you run out of luck, if you run out of skills, there is nothing left and you have to really hope he is not going to let you down."

Difficult wind conditions at Roswell airport mean that lift-off for the balloon will occur no earlier than 1130 local time (1730 GMT; 1830BST).

The absolute mark for the highest skydive is held by retired US Air Force Col Joe Kittinger.

He leapt from a balloon at an altitude of 102,800ft (31.3km) in August 1960.

Now an octogenarian, Kittinger is part of Baumgartner's team and will be the only voice talking to him over the radio during the two-and-a-half hour ascent and the 10-minute descent.

Felix Baumgartner's suit and capsule 1 2 3 4 7 6 5 8 9 10 11 12

Heated sun visor

Oxygen supply hose

Main parachute handle

HD camera on each leg

Suit made of layered material

Mirror to check parachute

Altitude gauge

High altitude balloon: expands with altitude

Balloon made of plastic film 0.002cm thick

Frame attaches capsule to balloon

Sliding door to exit capsule

Foam insulated shell

Engineers have done everything possible to limit the risks. They have built the Austrian a special pressurised capsule to carry him under the helium balloon.

He will also be wearing a next-generation, full-pressure suit, an evolution of the orange protective clothing worn by shuttle astronauts on launch.

Although the jump has the appearance of another Baumgartner stunt, his team prefers to stress its high scientific relevance.

The researchers on the Red Bull Stratos project believe it will inform the development of new systems for emergency evacuation from high-performance, high-altitude vehicles. Nasa and its spacecraft manufacturers have asked to be kept informed.

There are a few examples of pilots being ejected in supersonic airflows when their planes broke apart in the sky, but there is no detailed data on what happens to the human body as it goes supersonic and then, as it slows, goes subsonic again.

Freefall jump

Baumgartner will be instrumented to acquire this new data.

The concern is that he might be destabilised by shockwaves passing over his body, and that these might throw him into an uncontrolled spin.

"It's very important he gets into a delta position," said Baumgartner's trainer, Luke Aikins. "This is hands at his side and his head low, ripping through the sky. This will be crucial to breaking the speed of sound and remaining stable."

Engineers have incorporated an automatic device in his gear that would deploy a drogue stabilisation chute if he gets into trouble.

But the team's medical director, former shuttle flight surgeon Dr Jon Clark, hopes the stiffness of the pressure suit itself will suffice.

"We know that pressure suits limit mobility which we often consider as a bad thing, but in this scenario of going through the sound barrier, it actually adds a protection because it acts like an exoskeleton," he explained.

"We don't know what the human will endure accelerating through the sound barrier in coming back down without the aid of aircraft. And that is really the essence of the scientific goal of this mission."

There is high confidence Baumgartner will succeed in his quest. He has already completed practice jumps from 71,600ft (21.8km) and 97,100ft (29.6km).

The second of these jumps he described as an extraordinary experience.

"It's almost overwhelming," he said. "When you're standing there in a pressure suit, the only thing that you hear is yourself breathing, and you can see the curvature of the Earth; you can see the sky's totally black. It's kind of an awkward view because you've never seen a black sky. And at that moment, you realise you've accomplished something really big."

What conditions will Austrian Felix Baumgartner face for his attempt to make the highest ever skydive from 120,000ft (36.5km)?

A suite of high-definition cameras will follow the action. Some of these will be attached to Baumgartner himself.

But wary of broadcasting a tragedy to worldwide TV audiences, the organisers will be putting a 20-second delay on the live video feed.

Parachute Baumgartner aims to open his parachute about 5,000ft (1.5km) above the ground

Four GPS systems in the suit will gather the dive data required to satisfy the Federation Aeronautique Internationale (FAI) that records have indeed been broken.

"The data is recorded on an SD microcard in his chest pack," Brian Utley, who will file the official report to the FAI after the jump, told BBC News.

"I insert that card into the equipment. From that moment on, I have control over the equipment. I'm with it until Felix goes into the capsule, and when he lands I am the first person to approach him so I can take possession of that card again."

A BBC/National Geographic documentary is being made about the project and will probably be aired in November. and follow me on Twitter: @BBCAmos

More on This Story

Related Stories

The BBC is not responsible for the content of external Internet sites

More Science & Environment stories



  • HandshakeKiss and make up

    A marriage counsellor on healing the referendum hurt

  • Pellet of plutoniumRed alert

    The scary element that helped save the crew of Apollo 13

  • Burnt section of the Umayyad Mosque in the old city of AleppoBefore and after

    Satellite images reveal Syria's heritage trashed by war

  • Steve Barker in his studio in BlackburnCult music

    How did a Lancashire radio show get a global following?

  • Woman on the phone in office10 Things

    The most efficient break is 17 minutes, and more nuggets

BBC © 2014 The BBC is not responsible for the content of external sites. Read more.

This page is best viewed in an up-to-date web browser with style sheets (CSS) enabled. While you will be able to view the content of this page in your current browser, you will not be able to get the full visual experience. Please consider upgrading your browser software or enabling style sheets (CSS) if you are able to do so.