The Scaled Composites Model 351 Stratolaunch or Roc is an aircraft built by Scaled Composites for Stratolaunch Systems to carry air-launch-to-orbit (ALTO) rockets and subsequently repurposed to offer air launch hypersonic flight testing.
It was announced in December 2011, rolled out in May 2017, and flew for the first time on April 13, 2019.
The aircraft features a twin-fuselage design and the longest wingspan ever flown, at 385 feet (117 m), surpassing the Hughes H-4 Hercules "Spruce Goose" flying boat of 321 feet (98 m).
The Stratolaunch is intended to carry a 550,000-pound (250 t) payload and a maximum takeoff weight of 1,300,000-pound (590 t).
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