![Twin jet exhausts are inclined toward the ground to simulate takeoff conditions for certain engine installations.](https://www.nasa.gov/wp-content/uploads/2023/03/430760main_naca_twinjet_full.jpg)
The NACA: A Look Back
Twin jet exhausts are inclined toward the ground to simulate takeoff conditions for certain engine installations and to identify options for decreasing takeoff distances.
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https://www.nasa.gov/image-detail/naca-look-back-3/
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