Propeller

[Danny_Labrador]

No reason for posting apart from the fact that it was a really nice image of a ....propeller

 

[mainsail1]

I wonder which ship it is? Four props must mean it's a liner?

 

[gasdave]

Can't be very heavy if that guy's holding it up all on his own

 

[Grumpybear]

Can't be very heavy if that guy's holding it up all on his own

But look at that moustache! (not yours, I hasten to add).

Interesting that the outboard props have four blades, the inboards three. I wonder if she was designed like that, or modified to address vibration problems. The 1940 vintage Illustrious class carriers had the centre prop replaced with a four bladder because of dreadful vibration at high speeds, exacerbated in two ships by hull distortion after serious bomb damage.

 

[emsworthy]

But look at that moustache! (not yours, I hasten to add).

Interesting that the outboard props have four blades, the inboards three. I wonder if she was designed like that, or modified to address vibration problems. The 1940 vintage Illustrious class carriers had the centre prop replaced with a four bladder because of dreadful vibration at high speeds, exacerbated in two ships by hull distortion after serious bomb damage.

I wondered the same (the props not the 'tache) but thought I was just being an anorak! I presumed that a pair were for slow running operation with the second optimised for cruising speed. Couldn't work out which was which though!!

 

[Woodlouse]

But look at that moustache! (not yours, I hasten to add).

Interesting that the outboard props have four blades, the inboards three. I wonder if she was designed like that, or modified to address vibration problems. The 1940 vintage Illustrious class carriers had the centre prop replaced with a four bladder because of dreadful vibration at high speeds, exacerbated in two ships by hull distortion after serious bomb damage.

It seems the ship is the Mauretania, and wiki suggests that you are right, with a change to four bladed props to cure a vibration problem.
Possible that the outboard props are connected to turbine engines and the inboards attached to pistons.

 

[nortonmotors]

Is it me, or does the stbd rear prop have a bowler-sized piece of blade missing? That'll teach the navigator to try ploughing.

 

[Marsupial]

The picture is 1909, the propellers were modified before the ship entered service because of vibration, in 1906 she had 4 x 3 blade props.

interesting stuff, dont those propellers look "primitive" by modern standards.

 

[charles_reed]

Excellent photo of the 1st RMS Mauretania which wrested the Blue Riband, for Cunard, off Germanischer Lloyd in April 1909 and held it until the Bremen won it back in July 1929.
The propulsion was by 4 steam turbines, the 4-bladed props being fitted opportunistically when one of the original 3 bladers hit an underwater obstruction outside New York.
She and her sister ship, the Lusitania, were built with a £2.6million soft loan from the UK government, Lusitania on Clydeside and Mauretania on Tyneside. Obviously there was considerable rivalry between the two yards and Mauretania had an extra row of turbine blades fitted and, with the 4-blade props was able to easily outpace the, earlier, Lusitania (which was a U-boat victim and probably one of the main reasons the US entered WWI).
She was broken for scrap in 1929, when Cunard and White Star amalgamated and replaced in 1938 with a second Mauretania.

Cunard Records