Let's talk about [old] submarine propeller designs (nothing confidential)

Castout · 01-13-17, 09:31 AM

Old Russian submarine propeller design

https://1drv.ms/i/s!Ag_CxMbMom_9h2733t0nKsoGzwB2

Old American submarine propeller design

https://1drv.ms/i/s!Ag_CxMbMom_9h29tNo2_jujBAP5G

The Russian design if I speculate correctly is meant to optimize speed for any given rotational speed of the propeller. This is achieved by pushing seawater outward on the propeller longitudinal tip which in turn will be pushed back by the propeller blades resulting in more water being pushed back generating more opposing force that propel the submarine forward.

The American design seems not as easy to guess because these kinds of stuff isn't my expertise. However, if I am to speculate, the ring is meant to prevent some seawater from being pushed outwardly by the tip of the propeller's blades. What this does is a bit unclear. One, it could be to maximize speed too by minimizing outwardly flow of propelled seawater. It could also to minimize cavitation by smoothing the flow direction of propelled water. It could also for both guesses. However, the ring seems very thin instead of elongated so it might very well be to minimize cavitation.

What do you think?

01-13-17, 09:31 AM	#1
Castout Silent Hunter Join Date: Nov 2006 Location: Jakarta Posts: 4,794 Downloads: 89 Uploads: 6	Let's talk about [old] submarine propeller designs (nothing confidential) Old Russian submarine propeller design https://1drv.ms/i/s!Ag_CxMbMom_9h2733t0nKsoGzwB2 Old American submarine propeller design https://1drv.ms/i/s!Ag_CxMbMom_9h29tNo2_jujBAP5G The Russian design if I speculate correctly is meant to optimize speed for any given rotational speed of the propeller. This is achieved by pushing seawater outward on the propeller longitudinal tip which in turn will be pushed back by the propeller blades resulting in more water being pushed back generating more opposing force that propel the submarine forward. The American design seems not as easy to guess because these kinds of stuff isn't my expertise. However, if I am to speculate, the ring is meant to prevent some seawater from being pushed outwardly by the tip of the propeller's blades. What this does is a bit unclear. One, it could be to maximize speed too by minimizing outwardly flow of propelled seawater. It could also to minimize cavitation by smoothing the flow direction of propelled water. It could also for both guesses. However, the ring seems very thin instead of elongated so it might very well be to minimize cavitation. What do you think? __________________ My blog: http://exposingsingapore.wordpress.com/