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 Boat Design Forums Calculate Catamaran Resistance in Maxsurf

#1
01-11-2017, 02:47 PM
 papiylon Join Date: Dec 2016 Rep: 10 Posts: 4 Location: Canada
Calculate Catamaran Resistance in Maxsurf

Hi all,
I am currently designing a small recreational catamaran for a school project using Maxsurf. I have both of my hulls in the Resistance module and I am looking to obtain the graph of the resistance vs. the speed.

However, there are many analysis there and I was wondering which method should I select ( Analysis --> Methods...) to obtain the most accurate results? I tried calculating it by hand, but I do not have the required information for the wave resistance.

Cheers,

Rosalie
#2
01-11-2017, 06:07 PM
 Ad Hoc Naval Architect Join Date: Oct 2008 Rep: 2488 Posts: 5,193 Location: Japan
Rosalie

What is the length-displacement ratio (LD) of your design?
#3
01-12-2017, 11:02 AM
 papiylon Join Date: Dec 2016 Rep: 10 Posts: 4 Location: Canada
Its made for a user of 115 kg and the two hulls has a lenght of 4.5m ... if I am not mistaken, the ratio is 37.5 !?
#4
01-12-2017, 05:25 PM
 Ad Hoc Naval Architect Join Date: Oct 2008 Rep: 2488 Posts: 5,193 Location: Japan
Rosalie

No, the displacement is to the power of 1/3.

So your L/D ratio is 9.3. This means it is very slender, so if you select a method that uses long slender body theory, like the series 64. I don't have maxsurf, so I'm not sure what methods of analysis are available.
#5
02-20-2017, 08:09 PM
 Rastapop Naval Architect Join Date: Mar 2014 Rep: 27 Posts: 273 Location: Australia
You will want to use the "Slender Body" method in Maxsurf.

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