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Re: WW2 sub diesel engines turn so slow?

Posted by: Scott Sorenson ()

Date: October 15, 2018 06:47PM

Hi twsecrest,

What I have read, it seems to me that at around 500rpm's one would be running at the every limits of your engine.

Two large MAN diesel engines, each rated at 2170 HP and 470 RPM, are installed on the IXC submarine. The engines are built for rugged service. The peak and mean effective pressure per cylinder is high because of the installation of high speed superchargers. Water jackets require particular care as the engine is cooled by salt water. Furthermore, the engine must withstand high back pressures that are necessary when it is being used for producing exhaust gas for blowing ballast tanks.

The air induction and engine exhaust systems, as altered, were able to function for surface and submerged operations. The installation for surface operation is more or less standard in nature. For submerged operation a folding type snorkel was installed. Its installation was accomplished without an excessive amount of change in either the engine or in any associated systems.

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Subject	Written By	Posted
WW2 sub diesel engines turn so slow?	twsecrest	10/15/2018 04:12AM
Re: WW2 sub diesel engines turn so slow?	Scott Sorenson	10/15/2018 06:47PM

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Scott Sorenson Wrote:
-------------------------------------------------------
> Hi twsecrest,
> 
> What I have read, it seems to me that at around
> 500rpm's one would be running at the every limits
> of your engine.
> 
> Two large MAN diesel engines, each rated at 2170
> HP and 470 RPM, are installed on the IXC
> submarine.  The engines are built for rugged
> service.  The peak and mean effective pressure per
> cylinder is high because of the installation of
> high speed superchargers.  Water jackets require
> particular care as the engine is cooled by salt
> water.  Furthermore, the engine must withstand
> high back pressures that are necessary when it is
> being used for producing exhaust gas for blowing
> ballast tanks.
> 
> The air induction and engine exhaust systems, as
> altered, were able to function for surface and
> submerged operations.  The installation for
> surface operation is more or less standard in
> nature.  For submerged operation a folding type
> snorkel was installed.  Its installation was
> accomplished without an excessive amount of change
> in either the engine or in any associated systems.
> 
>