Watch the world's largest plane hit 46 mph in latest taxi tests
While Stratolaunch didn't meet its original 2016 launch goal, the company has been putting its massive plane through one test after another over the past year. During its most recent tests, the 500,000-pound aircraft with a 385-foot wingspan has successfully reached a top taxi speed of 46 mph. It still hasn't taken to skies, but that's a huge improvement over the 28 mph it hit during the first taxi tests the space transportation company conducted in December. According to Stratolaunch chief Paul Allen, his team has also verified that they can steer and stop the aircraft -- another success, since the tests' purpose is actually to certify that operators can control the largest plane in the world. The company hasn't revealed what other tests will need to be conducted before its new target launch date in 2020 and whether reaching 46 mph on the ground means we'll see it fly soon. But the hope is that once development is finished and it's been thoroughly te...