PICRYL
PICRYL

The World's Largest Public Domain Source

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Propeller Research Tunnel
Propeller Research Tunnel
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description

Summary

This test fuselage (circa 1926) is fitted with Cowl No. 10, the prototype for the first commercial installations. Developed in the PRT to reduce air resistance around a radial engine, the NACA Cowl proved to both lower air resistance and improve engine cooling. It earned the NACA its first Collier Trophy in 1929 and rapidly became a standard appliance for radial engines.
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Date

1926
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Source

NASA
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