Ship Simulator
English forum => Ship Simulator Extremes => Topic started by: evebri1 on September 04, 2012, 18:07:26
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:captain:
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?
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Hi Everard,
I find that the rev. indicator in the wheelhouse is the same for most of the ships. :doh: 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. :o 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.
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Angus
Thank's for you response .
Regards
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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
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Hello Luc,
Thank you for clearing up this matter.:thumbs: 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. :doh:
Regards,
Angus.
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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