![](https://www.nasa.gov/wp-content/uploads/2025/01/7605912294-f4e0b4eb2f-o.jpg)
Chief of aerodynamics Elton W. Miller ponders the future of the Sperry M-1 Messenger, the first full-scale airplane tested in the Propeller Research Tunnel. Miller was one of the designers of the Propeller Research Tunnel. via NASA https://ift.tt/xgPvTV7
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