Winner Engine RPM

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[evebri1]

 

I don't understand the following on the Winner when you look the control panel in the outside vieuw , the maximum RPM is 155. When you look on the inside vieuw of the bridge you can see 1200 RPM.

The RPM of a motor for a ship like the Winner is normally between 110 and 120 RPM.

My last ship was the "Mineral Seraing" with the following specifications:
33023 blt 1965 Cockerill Yards SA, Hoboken (819) L 29.6.1965 del 10.9.1965
17778 n 57775 dwt
229,67 x 32,16 x 12,402 x 16,44 m
Oil 2 SA 8 cyl 900 x 1550 mm Sulzer 17600 BHP (12946 kW)  120 RPM. speed  15,5 kn

Somebody can explain me what did I miss?

[Traddles]

Hi Everard,
I find that the rev. indicator in the wheelhouse is the same for most of the ships. Maximum ahead revs. 1200 but astern only 450.   I think Vstep have just used a standard indicator for all the ships, mainly to show in which direction the engine is running, rather than to  give an accurate reading of RPM.   You will notice that the inner scale shows % of RPM from 0% to 100% both ahead and astern.
I get max RPM on the overlay controls of "Winner" to be 165 RPM and for "Pride of Rotterdam" to be 154 RPM. I just looked at "Agile Solution" and her wheelhouse RPM indicator only shows % of RPM. "PoR" has 2 of the indicators like "Winner" one for each engine and also two like "Agile Solution".

Regards,
Angus.

[evebri1]

Angus

Thank's for you response .

Regards

[LucAtC]

Hello Angus, Everard,

You are quite right about the meters, and CPP ships should have 2 meters with needle, for RPM and pitch.
  The indications of the bridge meters are coupled to the control set value, and not the current value, consequently almost meaningless.

Also, the medium speed engine has a maximum speed of 514 RPM, and the shaft speed is indeed reduced to 165 rev. through a 1:3.115 reduction gear. It is supposedly a 8L48/60B (http://www.mandieselturbo.com/projectguidesengine/data/48-60B%20IMO%20Tier%20II%20%E2%80%93%20Marine.pdf) engine or any similar one in the same MAN IMO Tier II range. The shaft speed is necessitated by the relatively limited CPP diameter and the small draught.

Regards,
Luc

[Traddles]

Hello Luc,
Thank you for clearing up this matter. I am so ancient that I have no experience of CPP drive, merely single screw FPP ships with Triple Expansion or Turbine steam engines and Doxford opposed piston 2 stoke diesel engines. I did however sail on a Japanese built bulk carrier with a Sultzer engine. As a one time deck officer I have very little knowledge of engineering matters though.

Regards,
Angus.

[evebri1]

Hello Angus, Luc

Thank you for your explanation.
But my knowledge was only on oil two SA like Burmeister & Wain, Sulzer and MAN engines between 1950 and 1980 with a maximum RPM between 110 and 130.

Of course, I'm also a good knowledge on triple expantion steam, like the Liberty ships and reaction turbines which were constructed on the Victory ships.

But now is a long time ago.....

Regards