estimate the fuel use in early design stage

I believe the forum name is "boatdesign" not "shipdesign" or "professionalshipdesign" or even "professionalboatdesign".

Simply "boatdesign".

But if arguing and allienating original posters is what you delight in then carry on.

However, a simple yes or no would have answered the op's question...

-Tom

 

..the next one out for a little fight?

Yes or no to what ?
There was no question which could have been answered by yes or no.

Yes, this is the boatdesign net. Does that imply we have to talk like amateurs? Just because this is not the "professional bd.net" ??? I think not.

But if arguing and allienating posters is what you delight in then carry on.

To use your own words!

Regards
Richard

 

I hate to wade in, but….

Well said. We are all taught, those that either go to sea, or university to learn about all things nautical or both, that every part of a boat or ship has a unique name. Reason being to avoid confusion! Also there are many parts of a ship/boat that are also unique and thus require a noun to identify it…in the old days, metaphors helped to conjure up the name. The metaphor being the “action” of the person(s) doing the task or performing the task on the “equipment” of “part of boat/ship”. The name used, has stuck, no matter what an uneducated journalist wishes to use to describe “XXX”.

The correct name for a lavatory on the boat/ship is the “head”. But how many use the term toilet??...and how many know of the names origin, as one very simple example?

Well, perhaps you need not have replied then Tom. Since the question is about a “ship” not a “boat”.

Don't shoot the messenger...

 

Well... now I too hate to wade in...but....

One can hardly blame Jo Sixpack, or indeed journalists - or for that matter small-craft designers - for using incorrect terminology (litres or gallons per hour) when the engine manufacturers themselves do the same!

And of course, there would be little point in telling the same Jo that his Bayliner will use xx grams of fuel per 24 hour period when his engine is operating at yy % load.... he'd just shake his head and go find a journalist who would tell him something he could understand... like nmpg.....

 

In Australia there is probably the clearest distinction in the size of vessel and how they buy their fuel.

Most of the commercial boat operators ( not ships) don't want powering curves and honestly couldn't use them.They buy their fuel in Liters, their sight gauges are marked in liters and they want to be able to easily do some simple arithmetic to work out when to stop operations and get home.
They just want to know for example that they use around 70L an hour at 10 knots into the teeth of a force 7.

Many of these fishermen need forms to put the numbers in so they can remember the procedure what to multiply what to divide to work out their range ! These same people can spend a lifetime at sea as a small vessel Master but they are completely lost when they step out of a wheelhouse and onto a bridge. Most of them wouldn't even know the weight of the fuel on board their own boats.

When you get to a vessel that needs a ships engineer and a mate and a master like a trawler and above it's suddenly quite different. They use the weight of the fuel and they know and understand from first principles how to calculate everything.

 

First of all you have to define the manufacturer and the type of the engines that you plan to install for your project - I suppose....
The Engine's Manufacturer have published a leaflet includes the Performance Curves, where included the Fuel Consumption Curve (presented as gkWh vs rpm - means grams of fuel for instant use of every kW in one (1) hour operation compared to engine corresponding speed in revolutions per minute).