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Why Is Paul Allen Building The World's Largest Airplane? Perhaps To Launch A Space Shuttle Called 'Black Ice.'

After winning the Ansari X Prize, the co-founder of Microsoft is coming back to the space game.

Paul Allen's Stratolaunch airplane emerges from its hangar in Mojave, California.

A massive airplane being built by Microsoft co-founder Paul Allen moved a step closer to flight last week, when it crept out of its hangar in Mojave, California and practiced rolling down the runway, hitting a top speed of 46 mph.

Known as Stratolaunch, the plane has a wingspan even greater than that of business mogul Howard Hughes' famed Spruce Goose, and is designed to carry as many as three rockets, tethered to its belly, to about 35,000 feet. Once aloft, the rockets would drop, then fire their engines and deliver satellites to orbit.

But Allen has even bigger ambitions for Stratolaunch, and is considering pairing it with a new space shuttle that's known inside the company as "Black Ice."

In exclusive interviews last summer, Allen and Jean Floyd, Stratolaunch System's chief executive, laid out the company's plans for the giant plane, providing an answer to why anyone would want to build an aircraft that has 28 wheels, six 747 jet engines and a wingspan longer than a football field.

"I would love to see us have a full reusable system and have weekly, if not more often, airport-style, repeatable operations going," Allen said in an interview, while sitting in his Seattle office.

The Black Ice spaceplane - should it be built - would be about as big as the former space shuttle developed by NASA and capable of staying up for at least three days. It could be launched from virtually anywhere in the world, as long as the runway could accommodate Stratolaunch's size. And it would be capable of flying to the International Space Station, taking satellites and experiments to orbit, and maybe one day, even people - though there are no plans for that in the near term.

And then it would land back on the runway, ready to fly again.
"You make your rocket a plane," Floyd said. "So, you have an airplane carrying a plane that's fully reusable. You don't throw anything away ever. Only fuel."

For now, the company is focused on the maiden flight of Stratolaunch, which could come later this year. Then it would decide whether to pursue Black Ice.

Returning to human spaceflight could be a possibility sometime in the future, said Allen, the billionaire entrepreneur, who founded Microsoft with Bill Gates and now owns the Portland Trail Blazers and Seattle Seahawks.

"If you caught the bug back in the Mercury era, of course it's in the back of your mind," he said. "But I think you're seeing right now, other than [space station] resupply missions, most spaceflights are about launching satellites. That's the reality. And they are extremely important for everything from television to data all over the world. You can get data in the Kalahari desert because there's a satellite up there."

Stratolaunch has generated all sorts of interest, a curiosity that for years was being built in secret inside a hangar so big that the contractor fashioning it, Scaled Composites, needed special permits just for the construction scaffolding.

Vice President Mike Pence has visited the plane in its hangar and walked across its wingspan. Air Force Secretary Heather Wilson has dropped by to see it as well, writing on Twitter that she had "the chance to see firsthand how @Stratolaunch is developing an air-launch platform to make space more accessible."

Allen made history in 2004, when he hired Scaled Composites to build another spacecraft called SpaceShipOne that won the Ansari X Prize when it became the first non-governmental vehicle to reach the edge of space. Allen ultimately licensed the technology behind the spacecraft to Richard Branson, whose Virgin Galactic is now pursuing its own plan to fly tourists to space aboard yet another new spaceplane, known as SpaceShipTwo.

"Flying test pilots, I understand," Allen said. "But paying-man-on-the-street-type passengers, I wanted to leave that to someone else."

After bowing out of the space business, Allen eventually returned to pursue one of his greatest passions, and in 2011 announced he was building Stratolaunch. "You have a certain number of dreams in your life you want to fulfill," he said at the time. "And this is a dream that I'm very excited about."

Allen, a connoisseur of antique planes, has amassed a collection of World War II relics that he had painstakingly refurbished. He recovered them from old battlefields - a Messerschmitt, a German fighter plane, was dug out of a sand dune on a French beach where it had been buried for decades; an Ilyushin IL-2M3 Shturmovik was pieced together from the wrecks of four planes recovered in northwest Russia.

To showcase his collection, Allen created a museum, the Flying Heritage & Combat Armor Museum in Everett, Washington, which features a Grumman F6F-5 Hellcat, and a B-25 Bomber, among others.

As a child, Allen knew all the names of the Mercury 7 astronauts, as if they were the players of his favorite baseball team, and he wanted to be an astronaut when he grew up. But

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