Figure 1: Detailed geometry for STAR-CCM+ simulation of ship self-propulsion ... Assist propeller shaft and stern tube design to avoid bearing damage ...

The problem began on Feb. 3, when the Royal Navy reported that “routine pre-sailing checks” uncovered “an issue with a coupling on (HMS Queen Elizabeth’s) starboard propeller shaft”.

The best propeller-hull combination was tested for its performance by model scale tests: a 7.5% power reduction at the design speed was identified and the shaft rate of revolutions did not change.

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So how did the Navy’s top-secret propeller design technology land on production-boat prop shafts? “The Navy moved to different technology,” Platzer says, but he won’t elaborate. Stay tuned. Boating ...

The Flying Pancake (at Floyd Bennett Field, New York, in the early 1940s). Rudy Arnold Photo Collection, NASM, SI 2009-1152 The two propeller shaft fairings emerging on either side of the round ...