I need an outline of the construction, operationg, advantages and
disadvantages of the following types of marine gearing:
-Single Reduction Gearing
-Double Reduction Gearing
-Epicyclic Gearing

What are the usual applications of each type of these transmission
units (i.e. diesel engine, steam or gas turbines?) and why?

Also explain the teeth design, and identify the faults that may
develop on gear teeth and gear trains..Can you include as much pics
and sketches of the three types as you can

regards,

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Clarification of Question by infoseekerr-ga on 30 Apr 2003 16:24 PDT

Can you please include in-line references within your answer 
i.e. the URLs of the web sites used. 
 
Thanks

You did not say if you are thinking a one ton ship or a million ton
ship. My guess is the double reduction gearing has advantages with
multiple engines and turbines especially if the ship uses both. Two
props that can run one forward and one reverse is likely better
adapted to to double reduction. For the diesel which typically runs at
lower RPM than either kind of turbine, single reduction may less
costly (initial and repair) more reliable, smaller, less weight, and
quieter, cooler and more efficient, but all of these advantages likely
dissapear if a 100:1 (or variable) speed reduction is needed.   Neil

Hi Niel,
Thanks for your comment, I didn't say what size of ships i am thinking
because i asked for that (applications of the different types of
gears) and where can they be used (steam, gas turbines or diesels) but
generally i am interested in large commercial ships and not small
boats.. It would be interesting to know about Epicyclic gearings as
they are making a compact case..do you want to have a go at my
question?

Regards,