Folding boat propellers.
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Contra-rotating variable pitch propellers - GIF
Casting a giant propellor GIF
Propeller feathering - GIF
Free eBook: 173 Best Homemade Tools
desbromilow (Jul 31, 2021),
KustomsbyKent (Jul 30, 2021),
nova_robotics (Jul 31, 2021)
For sailboats. Low drag when not in use...
nova_robotics (Jul 31, 2021),
toeless joe (Jul 28, 2021)
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