The BMW 801 was the first German high-performance, air-cooled radial engine of new design introduced after the start of World War II.
By: Tech Planet
Title: This ENGINE is Not What You Think...
Sourced From: www.youtube.com/watch?v=tAIOlA2-q-A
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https://virallyfe.com/future-tech-now/homemade-ball-ejection-accelerator