PHXPhlyer wrote: ↑Thu Sep 01, 2022 8:51 pm
At 65,000 tons, I don't think it would be quite like hitting a pothole.
PP
Any distortion of the propeller would cause noticeable vibration. Certainly noticeable to an array of detectors that I hope would be fitted.
As Boac has mentioned it might be standard procedure to just use one propeller as two, even at slowest revolutions, might just move the ship so fast that it might be too difficult to stop it from running aground in the event of, say, a rudder problem. If they did strike the bottom or hit a submerged obstruction it should be discoverable from a survey of that part of the harbour they had moved over and the track followed on the way to sea. Only if any damage to the ship indicated that as a reason.
Despite its size the whole propulsion system is finely balanced system. In days of yore the shafts were very slowly turned over every few hours when alongside to make sure that no hogging or sagging had occurred in the propeller shafts between the plummer blocks.
Anyway maybe we'll find out for sure idc.