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 North American Aviation XB-70 Valkyrie rolling out after landing, employing drag chutes to slow down. In the photo, the outer wing panels are slightly raised. When the XB-70 was flying at high speed, the panels were lowered to improve stability.

 The XB-70A Valkyrie was the largest experimental aircraft, measuring 190 feet in length, with a wing span of 105 feet and standing 33 feet in height. The aircraft had a delta wing and hinged wing tip that could be folded down to a 65 degree angle to improve stability at the aircraft's supersonic speeds of up to Mach 3. At this speed the Valkyrie was designed to ride its own shock wave.