Monohull or mulithull design?

[FBB]

Hi Everyone,

I am a newbie to boatbuilding and was hoping for some input on the hull category of my design. The boat features two airtight pontoons (in purple and red), a rounded hull and a scow bow. I was looking into how to design the construction/scantling and realized that I didn't know what the categorization was? When I ran a hydrostatic stability test through orca 3d (with a max. weight of 1200 lbs), only the pontoons become wetted surfaces. Any advice or direction on what hull category (mono or multi hull) would be great.

For some context on the design, it's going to be built with 1/8" thick 5083 aluminum. I will be doing a complete weld at the pontoon to rounded hull connection point.

 

[TANSL]

Well come to the forum.
I would consider it a catamaran but would make significant changes to the wet deck and the bow structure.

 

[bajansailor]

I would agree with Tansl re the design of your wet (bridge) deck and that scow bow shape.
Why do you want the underside of the wet deck to be so deep and curved?
Ok, so the underside is still dry at a displacement of 1,200 lbs, but when you start moving and increasing speed, there could be interesting effects from wavemaking interference?
Your scow bow looks like a neat conic development of the ally plate - but the perspective view does not appear to tally with the bow view shown. Can you post some additional details of this area please?