catamaran hydrostatic calculation

[mizkuzi]

hello,

anybody has a manual hydrostatic calculation sample for a catamaran yacht in excel format? I need some good reference. I couldnt understand well how to do it since i've only knew some for monohulls... Please help thanks!..

[fer.cipriani]

By deduction I think so:

I: Moment inertia of single hull

Then:

I(cat)= 2 x (I x (beam/2)^2)= I x beam^2 / 2

Regards.

[jehardiman]

Everything is the same, you just have to calculate the waterplane inertia properly.

http://en.wikipedia.org/wiki/Parallel_axis_theorem

So to correct the equation above Ixx (cat) = 2*Ixx(ama)+2*Awp(ama)*(distance between ama CL's/2)^2

[mizkuzi]

Originally Posted by jehardiman

Everything is the same, you just have to calculate the waterplane inertia properly.

http://en.wikipedia.org/wiki/Parallel_axis_theorem

So to correct the equation above Ixx (cat) = 2*Ixx(ama)+2*Awp(ama)*(distance between ama CL's/2)^2

Hello,

Thanks for this reply. May you please be specific of the ff. legends u used in the formula stated?

Ixx = ?
ama = ?
CL = ?

Thanks a lot and advance happy new year!

Best Regards,
Joyce

[DCockey]

ama is one hull of a catamaran
ama CL is centerline of an ama
Ixx is moment of inertia about the x axis. Location of the x-axis is noted in paranthesis

[Alik]

i believe before asking such questions TS should adjust his signature

[ZaaraWilson]

I think the following link can help to get some idea :-
http://en.wikipedia.org/wiki/Displacement_%28ship%29