![](https://www.historynet.com/wp-content/uploads/2017/03/Crossfield-558-960_640.jpg)
The straight-wing D-558 Skystreak, designed by Ed Heinemann, underwent a radical redesign, resulting in the sweptwing D-558-2. (NASA photo)
The straight-wing D-558 Skystreak, designed by Ed Heinemann, underwent a radical redesign, resulting in the sweptwing D-558-2. (NASA photo)