Mark F
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The 401 on the propeller is "explained" here. Try not to laugh.
View attachment 67187872
The Titanic was actually Olympic,sunk on purpose in an insurance fraud. [Archive] - The Apricity Forum: A European Cultural Community
Olympic IIRC borrowed a propeller shaft, not a propeller from the allotment meant for Titanic after the collision with the Royal Navy Edgar class Protected Cruiser (not Destroyer) HMS Hawke. One of Olympic's outboard shafts was bent in the collision. About 6 months later Olympic suffered a prop blade failure when on a return trip from New York. This prop was on the central shaft (driven by turbines not reciprocating engines and therefore of different configuration). Olympic at the time of Titanic's sinking had a 4-bladed propeller on her central shaft and this was still fitted at the time of her refit later that year. Titanic according to the builders notes and design drawings was specified with having a very different 3-bladed prop on the central shaft (as an experiment to compare performance to Olympic). Titanic's central shaft prop is not visible at the wreck site.
401 was the yard number. Olympic was a product of yard 400, Titanic of yard 401. Even if a replacement prop had to be made for Olympic because she borrowed one from Titanic the replacement would have been made for Yard 401 and to the design specified for Titanic, which had a different pitch compared to Olympic. But none of that really matters as the wing props were not switched.
At the time of Titanic's sinking Olympic was in the Atlantic on a return trip from New York and was one of the ships that attempted to join the rescue of survivors - but was too late and never made it to the scene.
So how could Olympic be in two places at once?
I could probably keep going but what for? Whoever wrote the crap in the attached image didn't do their homework.