X-1B
The second generation X-1s used the same wing, horizontal tail, and XLR-11 rocket engine as the first generation aircraft, with a new cylindrical fuselage just over 4 1/2 feet longer than the original design. This was the maximum length that could be carried by a B-29 or B-50 launch aircraft.
- X
https://www.nasa.gov/image-detail/x-1b/
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