Boat lines plan

Dear friends
Good day
There is a boat lines plan in the attachment.
L=12 B=4.2 H=2.4 with internal diesel engine 400hp.
Any advise about hull lines will be helpful for me.
Regards

 

What sort of advice are you looking for?
It would be useful if you could provide a side profile view, showing the buttock lines.
Do you intend to build this boat, or is it a college design project?
How did you come up with the lines plan so far?
Do you have a 'Statement of Requirements' for this design?

 

It is a very strange shape. Compare it to a conventional hull. This design has high deadrise forward, then in flat and deadrise again. Also, all the sections are pronuncedly hollow. Is there a very specialized application that requires it?

 

Dear gonzo
You are right. But the owner request to design the hull in this way.
He wants to use this boat as fishing boat and ground it on the land for hull cleanning.

 

The client is always (or almost always) right but he should not intervene in the definition of the shapes of the waterline downwards. You will be responsible for the boat not sailing as it should, not the client.

 

Conventional hull of a boat 12m , has lesser dead rise angle with outboard engine.but i had no choise about hull shape to suggest the client.

 

In your first post you mentioned a 400 hp inboard diesel engine - now you are talking about an outboard engine...... which one is it?

I presume that you must have a side profile drawing showing the buttock lines - can you post this please?

You should also have a general arrangement drawing or sketch showing the layout of the fishing boat - can you post this as well please?
Re how the owner wants to 'ground the boat on the land', does this mean beaching it and then hauling it up the beach, with a winch or a tractor?

The owner must have given you a more detailed list of requirements surely, apart from what you have mentioned above, and re how he wants the hull designed this way.
It is a rather complicated hull shape - a simpler hull shape, perhaps with chines, would be much easier to build.
What is your intended construction material for the hull / boat?

 

Material FRP
Grounding means in shallow water during low tide , the boat get on the soft sand ground.

 

Engibe inboard 400hp.

 

Nothing strange, very much like so called "speed sjarks" in Norway. Maybe a bit more V angle and a bit narrower compared to them.. Displacement when loaded?

 

Light weight 8ton. Full load 10 ton.

 

The boat appears to be somewhat narrower than one would expect. That, together with the high depth and, presumably, shallow draft, may represent some problem with its stability. The high depth can also make working from the deck difficult.
There are things in that design that don't look normal and that's not good. But, of course, without doing a few numbers, nothing should be stated, just express an opinion.
Very high light ship compared to full load

 

@naserrishehri what speed are you hoping to achieve with this hull form?
The aft section looks more like a displacement hull (?) - it does not seem to have much planing surface?
If this is the case, then 400 hp would be excessive for the requirements if you are planning on cruising at say 7 or 8 knots.
The engine is very 'low down' in the hull - and the hull has a lot of deadrise amidships, hence I am wondering if there is actually enough room for a 400 hp diesel to be fitted in the position shown?
Do you have a better side profile drawing (showing the actual sheerline) rather than that funky drawing shown in post #10?
And I will endorse Tansl's comments above....

 

The client hope to get 20knot speed.
1/10 scale model is attached.