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A man stands inside the entrance of a tunnel, looking up at a small propeller plane. The tunnel, viewed from the side, is like a cylinder with sides curving inward. The photo is in black and white.
NASA

Elton W. Miller, chief of aerodynamics at what is now NASA’s Langley Research Center in Hampton, Virginia, stands in the entrance cone of the Propeller Research Tunnel in this Sept. 9, 1926, photo. In front of the entrance is the Sperry M-1 Messenger, the first full-scale airplane tested in the tunnel.

The Propeller Research Tunnel, or PRT as it came to be known, was only the National Advisory Committee for Aeronautics’ third wind tunnel and the largest one built. The PRT was in fact the largest tunnel built at that time anywhere in the world. Designed to accommodate a full-scale propeller, the throat of the PRT was 20 feet in diameter.

Learn more about the PRT from the report originally published in December 1928.

Image credit: NASA

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    • By NASA
      NICER (left) is shown mounted to the International Space Station, and LEXI (right) is shown attached to the top of Firefly Aerospace’s Blue Ghost in an artist’s rendering.NASA/Firefly Aerospace The International Space Station supports a wide range of scientific activities from looking out at our universe to breakthroughs in medical research, and is an active proving ground for technology for future Moon exploration missions and beyond. Firefly Aerospace’s Blue Ghost Mission-1 landed on the Moon on March 2, 2025, kicking off science and technology operations on the surface, including three experiments either tested on or enabled by space station research. These projects are helping scientists study space weather, navigation, and computer performance in space— knowledge crucial for future Moon missions.
      One of the experiments, the Lunar Environment Heliospheric X-ray Imager (LEXI), is a small telescope designed to study the Earth’s magnetic environment and its interaction with the solar wind. Like the Neutron star Interior Composition Explorer (NICER) telescope mounted outside of the space station, LEXI observes X-ray sources. LEXI and NICER observed the same X-ray star to calibrate LEXI’s instrument and better analyze the X-rays emitted from Earth’s upper atmosphere, which is LEXI’s primary target. LEXI’s study of the interaction between the solar wind and Earth’s protective magnetosphere could help researchers develop methods to safeguard future space infrastructure and understand how this boundary responds to space weather.
      Other researchers sent the Radiation Tolerant Computer System (RadPC) to the Moon to test how computers can recover from radiation-related faults. Before RadPC flew on Blue Ghost, researchers tested a radiation tolerant computer on the space station and developed an algorithm to detect potential hardware faults and prevent critical failures. RadPC aims to demonstrate computer resilience in the Moon’s radiation environment. The computer can gauge its own health in real time, and RadPC can identify a faulty location and repair it in the background as needed. Insights from this investigation could improve computer hardware for future deep-space missions.
      In addition, the Lunar Global Navigation Satellite System (GNSS) Receiver Experiment (LuGRE) located on the lunar surface has officially received a GNSS signal at the farthest distance from Earth, the same signals that on Earth are used for navigation on everything from smartphones to airplanes. Aboard the International Space Station, Navigation and Communication Testbed (NAVCOM) has been testing a backup system to Earth’s GNSS using ground stations as an alternative method for lunar navigation where GNSS signals may have limitations. Bridging existing systems with emerging lunar-specific navigation solutions could help shape how spacecraft navigate the Moon on future missions.
      The International Space Station serves as an important testbed for research conducted on missions like Blue Ghost and continues to lay the foundation for technologies of the future.
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