Thrust Reversers

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I've read in several reports about ships with propellers in steerable pods that were designed to "crash stop" by turning the pods 90 degrees inward or outward. I don't understand why that works.

Probably because the steerable pods are far less streamlined when turned sideways, and add a huge amount of drag in the water.

http://www.boatnerd.com/pictures/spe...005_0402AO.jpg