Science: Sensational Subchaser

Nazi U-boat commanders have good cause this week to cry: Achtung! (Look out!) and crash-dive. Coming at them at hitherto unattainable speed is an improved type of U.S. subchaser powered by an extraordinary new engine and driven by an extraordinary new propeller.

The engine is a diesel only one-third as big and only a fraction of the weight of the best former diesels of the same horsepower. The propeller is the first marine screw whose blades can be adjusted to any angle or can be completely reversed while the boat is in motion. Results:

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