Does my bottom look big?

[Greybeard]

This is a photo of the Olympic after having lost a propeller blade in February 1912. She had variable pitch props port and starboard but the main prop was fixed. Just look at the size of those rudder hinges.

[groily]

It looks very big, GB.
Surprised you can get it on your new saddle.
(When I'd realised it wasn't your own rear end, had to do a double-take just in case it was one of our new aircraft carriers.)

PS Interesting technically:
"Olympic was driven by three propellers. The two three-bladed side propellers were driven by two triple-expansion engines, while the four-bladed central propeller was driven by a turbine that used recovered steam escaping from the triple-expansion engines. The use of escaped steam was tested on the SS Laurentic two years earlier."