Stratolaunch, the massive airplane that is being built by Scaled Composites to deliver satellites to low Earth orbit, successfully ran all six of its Pratt & Whitney turbofan engines for the first time this week, the company has announced. The engines, which previously powered a Boeing 747, support a payload capacity of more than 150,000 pounds and an operational range of about 2,000 nautical miles. At 385 feet from wingtip to wingtip, Stratolaunch is the largest airplane, by wingspan, ever built.
Source: avwebFirst Engine Start For Stratolaunch