The inventor of the screw-propelled vehicle was a genius

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[MarkStockman-bj]

Travels more easily on quicksand than either water or solid ground.

[markrowland]

Picture of a Model T, fitted with similar.

[BStott]

spiral drums are called, "SCREWS."

[reinhartvonzschock]

Never assume others are as stupid as you are. We can see how it works

[andrewhilton]

Be thankful to Archimedes. Earlier folk named this configuration after him.

[mikewhite]

How long do drums last, look like they would wear out quickly or leak, taking on water in the drums???