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Toroidal propeller - Wikipedia
Bent Propeller - Wikipedia
Looped propellers: A noise-killing game changer in air and water
GitHub - rosco-pc/propeller-wiki
Propeller strike - Wikipedia
Aircraft Propeller Theory
Propeller Mario - Super Mario Wiki, the Mario encyclopedia
North American T-28 Trojan - Wikipedia
Our boy, Propeller Guy, has his own page on the Titanic wiki! : r/titanic