another idiot with mad ideas, new boat build

[Tender_aft]

Luckily I'm not in the country. For now I will watch and learn (and drool)

you dont want me to tell you then, that there is a boat show next week end at crick marina in Northants, where you can go and speak to the marine architect and designer
h=

 

[Robg71]

or you can knock on his door in The Netherlands

 

[Erik C]

Is 4/5 mm plate thickness enough to get a CE A category? Seems a bit thin to me for the size of boat.

 

[Robg71]

no, its cat B

 

[grumpy_o_g]

Presumably the plate thickness required drops in proportion to the distance between ribs and stringers? From that pic it's pretty much a skin and to provide the torsional rigidity to the frame (if that's the right way to describe the skeleton frame twisting). The only thing about 20 knots is you know it'll be 18 knots on a good day once you've got all the rubbish on board and a bit of weed on the bottom. Does that mean you be having the throttles (or whatever on diesel) nearly wide open as soon as you want to go beyond hull speed?

If this post sounds like I know what I'm talking about it's not meant to - don't have a clue but fascinated all the same.

 

[Robg71]

If this post sounds like I know what I'm talking about it's not meant to - don't have a clue but fascinated all the same.

me too

 

[Robg71]

OK, I really didn't expect this, but new hull design has a concave aft section.
I remember a few years ago watching a program from a design team working with this idea for the royal navy, and they gave it a big thumbs up.
Apparently the RN did not... cant remember what bureaucratic decision was made about it.

More details to follow, I m am not going to post his designs, till I have spoken with him and asked.
The top sides have changed slightly as well, and I prefer the original. new one has a bow that is more vertical, than raked.

 

[rustybarge]

OK, I really didn't expect this, but new hull design has a concave aft section.
I remember a few years ago watching a program from a design team working with this idea for the royal navy, and they gave it a big thumbs up.
Apparently the RN did not... cant remember what bureaucratic decision was made about it.

More details to follow, I m am not going to post his designs, till I have spoken with him and asked.
The top sides have changed slightly as well, and I prefer the original. new one has a bow that is more vertical, than raked.

Iirc Nigel Irens designs hulls with flat or nearly concave aft sections.
But how do they perform in lumpy conditions?

 

[Robg71]

It's definitly spoon shaped underneath at the last third of the hull length...

 

[Tender_aft]

OK, I really didn't expect this, but new hull design has a concave aft section.

Are you sure it's not a ringer....and they have just welded a catamaran on the back

 

[Robg71]

No idea
Looks unusual to my untrained eye. But there again, it could've the latest and greatest in SD design

 

[rbcoomer]

Crikey Rob - this looks like a project and a half! How much is done when you get her then - is it really a bare hull and if so, how on earth will you project manage from the depths of the North Sea??? (or will this be a new full time occupation?) Inspirational idea however and I can see I'll have to set aside some reading time for following...

 

[JerseyDiver]

Crikey Rob - this looks like a project and a half! How much is done when you get her then - is it really a bare hull and if so, how on earth will you project manage from the depths of the North Sea??? (or will this be a new full time occupation?) Inspirational idea however and I can see I'll have to set aside some reading time for following...

No problem, its steel and needs welding.

Maybe the first boat ever built on the seabed of the North Sea ???

 

[rbcoomer]

(I hope Rob likes painting just as much though... )

 

[Robg71]

I am sure people will think I'm an idiot even contemplating doing this.
But I reckon it's do-able on a cheapskate budget like my miserable Yorkshire roots will be proud of.

You can order anything from blank sheets of steel, to a complete boat. And any stage in between.
What this really me is the budget to do what I can myself, and farm out the rest, whilst I go back and blow bubbles for a month... (Lucky monkey)
It's not going to be quick, but I once I get going I can't see it taking too long either.
Work have really shocked me as well at the moment, and given me a full time salaried contract for 130 days minimum, so I'm well happy with plenty of time off

 

[wonky]

Can't wait for a new "boat in build" thread. Do it

 

[Robg71]

Can't wait for a new "boat in build" thread. Do it

I'll start the whip round now

 

[wonky]

I've got a slightly used anode you can have

 

[Robg71]

deal

 

[paul.norton]

OK, I really didn't expect this, but new hull design has a concave aft section.
I remember a few years ago watching a program from a design team working with this idea for the royal navy, and they gave it a big thumbs up.
Apparently the RN did not... cant remember what bureaucratic decision was made about it.

More details to follow, I m am not going to post his designs, till I have spoken with him and asked.
The top sides have changed slightly as well, and I prefer the original. new one has a bow that is more vertical, than raked.

Hi Rob,
I too sort of remember that programme. Was one of the design team a Thornycroft? Their solution was for a much broader beam vessel than the current frigates etc. which they claimed would be a better weapons platform. There was, I believe, some doubt about pounding in heavy seas.

I'll look around and see if I can find more.

Paul