RNLI lifeboat fuel consumption

Bajansailor

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Just saw this note (press release?) in the YBW newsletter emailed to me. Click on
http://ybw.com/auto/newsdesk/20080728104619mbmnews.html
for the story about how the lifeboats are being hit hard by the rising fuel costs.
What intrigues me though is the statement "A single Trent Class lifeboat uses 360 litres of fuel an hour at its top speed of 24 knots, but only 100 litres an hour at 20 knots".

As far as I know, the Trents were all fitted with 800 hp MAN engines. Is that 100% true re the huge difference in fuel consumption quoted above?
If yes, then it certainly would make sense to throttle back.
I have been on trials on these boats (almost 20 years ago), and it was standard practice then for the cox'ns to go at full chat most of the time.

The top speed is now quoted as being 24 knots - both the Trent and the Severn were initially designed to have a maximum speed of 25 knots - I wonder if the Severn is now also 24 knots? They were fitted with twin 1,200 hp Caterpillar engines.
 
think those figures a little optimistic / PR ? Man's would be burning around 35% -40% less given they would probably running about 500 rpm less I would a say at 20 knts more like 200 litres an hour. 100 litres an hour for twin 800 hp MAN's at 70% , yes please, holy grail etc /forums/images/graemlins/grin.gif
 
Looking at how many times the Weymouth lifeboat went out last week in the 4 days we were there they must have used a drop, never seen it go out so many times while we we there.
 
I do know that the coxswains choose at what speed they do depending on the shout. They determine if the extra speed of full-chat is going to make a difference to the outcome and if they believe it might then they do full-chat... otherwise they may go slower. For example... there is an urgency to a fire on board or a sinking boat that may result in the max speed being chosen where as an engine failure in open water may not.

Conditions also enter the equation and, I am sure, do other things too.
 
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