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And I can prove it! Because valveless pulsejets are engines with zero moving parts

The valveless pulsejet engine is one of the simplest known engines, consisting of just a hollow pipe with no moving parts.
Scientific American

The Knight Valveless Engine

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The New York Times

America Triumphs at England's Show; Knight's "Valveless" Engine and Cars Without Gear Boxes Attract Attention at Olympia Exhibit.

Special Correspondence THE NEW YORK TIMES. R.P. HEARNE. New York Times subscribers* enjoy full access to TimesMachine—view over 150 years of New York Times journalism, as it originally appeared. *Does ...
The New York Times

THE KNIGHT ENGINE TO COME BACK HERE; English Daimler Agency to be Established with Cars Only Equipped with the Knight. CAUSED SENSATION ABROAD Keen Interest in the Valveless ...

TimesMachine is an exclusive benefit for home delivery and digital subscribers. About the Archive This is a digitized version of an article from The Times’s print archive, before the start of online ...
Scientific American

Valveless Engines at the Centennial

If you enjoyed this article, I’d like to ask for your support. Scientific American has served as an advocate for science and industry for 180 years, and right now may be the most critical moment in ...