Metal Multihull Cruiser - Seeking Input

Hey, thank you so much. Takes a good person to offer advice to perfect strangers.

So, let's see if I'm getting a basic understanding of the situation (not the formula) the way my brain is interpreting this.

If I then want the waterline to sit on an imaginary line longitudinally along each pontoon at say 375mm allowance for freeboard it would be 4321Kg ?

What does mLD stand for and am I getting anywhere near on track or is that completely wrong ?

Thanks again....I have about 16 more questions so if you don't mind I'll be in contact again. I won't swamp you with questions until I understand more of the logic behind it.

A grateful Aussie....Brad.

 

Your calculation is correct, a freeboard of 375 mm would give you 4321 kg of displacement.
The "mLD" is the full load displacement, i.e. the weight of the structure + all the ship's equipment + all the liquids on board + all the payload.
Send me a PM, if you prefer, to exchange more information (you need to ask the moderator for permission to send/receive messages).