![Alternative Low Noise Fan System in 9x15 Foot Wind Tunnel](https://www.nasa.gov/wp-content/uploads/2023/03/alternative-low-noise-fan-834732.jpg)
Alternative Low Noise Fan System in 9×15 Foot Wind Tunnel
Progress toward quieter aircraft: Alternative Low Noise Fan System mounted in the 9'x15' Low Speed Wind Tunnel.
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https://www.nasa.gov/image-detail/alternative-low-noise-fan-system-9x15-foot-wind-tunnel/
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