design motorboat

[nicola1985]

Hello everyone.. .
for pleasure in leisure time I would like to devote myself to the design of a motorboat having the length of about 6 meters and an outboard motor of about 50 hp.

I wanted to know if there's any resources available to start drawing a draft...
are completely fasting of the structural requirements that must have a motorboat!

Thank you!

 

[Exatem]

Hello everyone.. .
for pleasure in leisure time I would like to devote myself to the design of a motorboat having the length of about 6 meters and an outboard motor of about 50 hp.

I wanted to know if there's any resources available to start drawing a draft...
are completely fasting of the structural requirements that must have a motorboat!

Thank you!

Let's focus your question. What do you mean by design? starting from the white sheet? what peculiar characteristics should this motorboat have compared to what already offers the market? Do you have any ideas about the building plan? what material should be done? Do you want to size the structure or do you think you're inspired by an existing one?
to design something really feasible, if you are fast of matter, you need someone who follows you "step by step" starting from the study of the forms of carena, from the structural calculations to perform, etc. etc. keeping in mind that you can hardly do something credible by self-taught.
documentation for example (such as technical manuals), are few and rare.
drawings are intellectual property of companies that will hardly be willing to give you (if you make a case in the images you can find on the internet, rarely is visible in a useful way the living work of a boat).
You can read this 3ad:http://www.cad3d.it/forum1/showthread.php?t=27404 in which we try to define an an analytical method for the sizing of the components of a bridge. I will shortly post a method for the sizing of the bandage and the bones (I have to finish the draft) that might interest you.
be clear, I do not want to discourage anyone, but try first to define what are the fundamental parameters and then we will make some more technical reasoning.
Bye.

 

[Fulvio Romano]

Hello everyone.. .
for pleasure in leisure time I would like to devote myself to the design of a motorboat having the length of about 6 meters and an outboard motor of about 50 hp.

I wanted to know if there's any resources available to start drawing a draft...
are completely fasting of the structural requirements that must have a motorboat!

Thank you!

a set of clarifying questions:
Are you interested in design or construction?
50cv is a stupid power. With 40cv you don't need a driver's license, what for those ten extra horses?
- material? Vtr?
- Style? boston-whaler or aquariva?

Now let's stop here.

 

[nicola1985]

Let's focus your question. What do you mean by design? starting from the white sheet? what peculiar characteristics should this motorboat have compared to what already offers the market? Do you have any ideas about the building plan? what material should be done? Do you want to size the structure or do you think you're inspired by an existing one?

I mean starting from the white sheet...in the sense that I have something in mind but you have to draw. . .
the motorboat must be suitable for underscored boat trips.. Suitable for 6 people.
I would like to inspire something already existing on the market like:http://www.sessamarine.com/_vti_g1_photo_aspx_idm_120-rpstry_5_.sphtml both for the interior and for the exterior.. .

to design something really feasible, if you are fast of matter, you need someone who follows you "step by step" starting from the study of the forms of carena, from the structural calculations to perform, etc. etc. keeping in mind that you can hardly do something credible by self-taught.

are not fasting on mechanical design, they are fasting on nautical design.. .
My area is mainly automotive.

as material I would like to use a foam and vtr sandwich in epoxy matrix.
I'd be very grateful if you were driving me step by step...
for the motor is good to me maximum 40cv so you drive without license!

 

[nicola1985]

a set of clarifying questions:
Are you interested in design or construction?
50cv is a stupid power. With 40cv you don't need a driver's license, what for those ten extra horses?
- material? Vtr?
- Style? boston-whaler or aquariva?

Now let's stop here.

for the moment the only design. . .

up to 40cv to drive it without a driver's license I'm fine with.

material rigid foam sandwich and vtr in epoxy matrix.

the style I send you back to the above post.. .

 

[Fulvio Romano]

I would like to inspire something already existing on the market like:http://www.sessamarine.com/_vti_g1_photo_aspx_idm_120-rpstry_5_.sphtml both for the interior and for the exterior.. .

One thing about the genere? http://www.tecnonaval.it/750.html

 

[Fulvio Romano]

I wanted to know if there's any resources available to start drawing a draft...

What do you mean, bear?
human resource? software? Are they already done?

for the draft I don't think it's a big problem, in 2d you begin to study the general plans in terms of plant, profile and longitudinal section.
a stern section, so much to understand what starship you have in mind.

That's it?

I don't think you need to know about structures.

 

[nicola1985]

One thing about the genere? http://www.tecnonaval.it/750.html

It's exactly like this...

 

[nicola1985]

What do you mean, bear?
human resource? software? Are they already done?

for the draft I don't think it's a big problem, in 2d you begin to study the general plans in terms of plant, profile and longitudinal section.
a stern section, so much to understand what starship you have in mind.

That's it?

I don't think you need to know about structures.

I would be interested in a 3d cad from which to start by modifying it... if I find it well otherwise with so much patience I start from scratch!

to draw the hull profile from what part? I mean what is the profile that guarantees the best efficiency?

 

[nicola1985]

a small boat like this:

 

[Fulvio Romano]

I would be interested in a 3d cad from which to start by modifying it... if I find it well otherwise with so much patience I start from scratch!

a 3d from which to start I would say no...

to draw the hull profile from what part? I mean what is the profile that guarantees the best efficiency?

If there is, why should others exist?
What do you mean by efficiency?

Do you have an idea of cruising speed? maximum speed? from these calculations (or rather, you cover from an existing boat, because I think I understand that you are not able to make calculations) the parameters of famine:
- floating length
- floating width
- star angle (deadrise) (you'll want to make it flat)
- size and number of hydrodynamic surfaces (chain, skates, flap)

said this I would start drawing the blanket and the interior

done this, you should be able to make a draft load exponent and then find the displacement and the centerpiece.

comparing baricentre and famine center you should guess if everything is similar to the boat from which you took the cue. If so, and considering that it is only a theoretical exercise, you can leave the calculation of the metacentre, and the analysis of the straight carenes.

Good. now the structural part.
When you're talking about sandwiches and foams, you're gonna give me a break. What do you have in mind? Hand lamination? Then I would use expanded polyurethane for hull structures, and would limit the sandwich to the blanket.
the advantage of the outboard engine is that the structures do not have to take into account the motor base and the pass-boat. Well, then you just need to copy smartly from an existing boat, in terms of number of madmen and longitudinal, and their size.

then there are local structural reinforcements under bits, winchs, psalm, battalion, blah, blah, blah.

I'm done.

simple?

 

[Exatem]

a small boat like this:

not to burden the forum unnecessarily, please use the appropriate attachment management function to add images.
Thank you.

 

[nicola1985]

a 3d from which to start I would say no...


If there is, why should others exist?
What do you mean by efficiency?

Do you have an idea of cruising speed? maximum speed? from these calculations (or rather, you cover from an existing boat, because I think I understand that you are not able to make calculations) the parameters of famine:
- floating length
- floating width
- star angle (deadrise) (you'll want to make it flat)
- size and number of hydrodynamic surfaces (chain, skates, flap)

said this I would start drawing the blanket and the interior

done this, you should be able to make a draft load exponent and then find the displacement and the centerpiece.

comparing baricentre and famine center you should guess if everything is similar to the boat from which you took the cue. If so, and considering that it is only a theoretical exercise, you can leave the calculation of the metacentre, and the analysis of the straight carenes.

Good. now the structural part.
When you're talking about sandwiches and foams, you're gonna give me a break. What do you have in mind? Hand lamination? Then I would use expanded polyurethane for hull structures, and would limit the sandwich to the blanket.
the advantage of the outboard engine is that the structures do not have to take into account the motor base and the pass-boat. Well, then you just need to copy smartly from an existing boat, in terms of number of madmen and longitudinal, and their size.

then there are local structural reinforcements under bits, winchs, psalm, battalion, blah, blah, blah.

I'm done.

simple?

It's just not...

for lamination I would use vacuum bag technique.
I have a rohacell.

for the calculation I am not able, but I have the skills to understand. . .
for this I asked for resources from where to take stock (books, results).
on the delftship site there is a good database from which I can draw inspiration.

 

[PaoloColombani]

for lamination I would use vacuum bag technique. I have a rohacell.

therefore infusion. I have the impression that nicola intends to be serious.
but then once you create the 3d model you will have to create a mold, with which system do you intend to proceed?

 

[PaoloColombani]

One thing about the genere? http://www.tecnonaval.it/750.html

fulvio, I took a look at your projects, I especially liked the wake 60' and the 32m shuttle! Are you the designer?

 

[Fulvio Romano]

It's just not...

for lamination I would use vacuum bag technique.
I have a rohacell.

but how many boats do you want to build?
you do not write unique patterns, it is a waste of time and money. Not to mention that Albanian illiterate can do you a good job of manual lamination, especially if you put in his hand a spray cut. if you realize by infusion and wrong entrances, pressure profile and/or care, at the first wave of mascone you delamina the keel and you have fun!

Not to mention that an unmade art script is a grave occasion for the osmosis that feeds on air bags, glass stick and non-catalyzed resin.

therefore infusion. I have the impression that nicola intends to be serious.
but then once you create the 3d model you will have to create a mold, with which system do you intend to proceed?

and of course, because if you really want to build, according to the technique of making it must change also the modeling.

banal example, if you hand-wash, for the madmen you can use polyurethane omega. If you have to write, the structures must be deformable, it is therefore necessary to make apart a structural spider and paste it to the hull. at that point, in the structural spider you can integrate part of the furniture, which then changes angle of deform.

that change of technique realized in half project means to start over.

 

[Fulvio Romano]

fulvio, I took a look at your projects, I especially liked the wake 60' and the 32m shuttle! Are you the designer?

to begin slowly with the offenses. designer to whom???? :biggrin:

I'm not the designer. It's a long story, however the wake design is of a milan architect, that of the shuttle of a napoli studio. I collaborated with both, but almost exclusively for the fairing of surfaces.

 

[Exatem]

It's just not...

for lamination I would use vacuum bag technique.
I have a rohacell.

for the calculation I am not able, but I have the skills to understand. . .
for this I asked for resources from where to take stock (books, results).
on the delftship site there is a good database from which I can draw inspiration.

delftship is good software to begin with. Also in the free version, which you can download freely from the site on the contrary, I recommend if you have not already made it register to access the database, you can get the construction plan from the 3d model of the famine and the gometric and hydrodynamic data.
I don't know what to tell you. there was the good "water foundations" of u. costaguta but it has been exhausted for a long time, I fear it is introvabile today.
for the calculation of the bandage and the bones, as I have already told you, give me time to finish and then place a scheme with formulas.

In fact, I take advantage.
because I am not an engineer but a poor amateur (who is also a little broken to search, write, engage, then maybe to be criticized), if someone had the goodness to write every so often some explanation on "how to do", we would all be happy and grateful.

Meanwhile, look if you find a pattern of your pleasure then we'll talk about it.

 

[Fulvio Romano]

In fact, I take advantage.
because I am not an engineer but a poor amateur (who is also a little broken to search, write, engage, then maybe to be criticized), if someone had the goodness to write every so often some explanation on "how to do", we would all be happy and grateful.

Got it.
Sorry.

@nicola
a part of the "how to do" you can find here: http://www.cad3d.it/forum1/showthread.php?t=16852in particular here: http://www.cad3d.it/forum1/showpost.php?p=139667&postcount=8there is the model of a carena npl. fast, but displaced.
You stop until you like it, then you draw us over a planant hull with knee and what else.

for the rest, while being an engineer, I have neither the skills, nor the time, nor the desire to rewrite "over and under the waves". Maybe I could teach you something, because it's my job, but I would never allow myself to replace myself at exatem, let alone criticize him.

Good evening.

 

[Exatem]

Got it.
Sorry.

is not addressed to you but to the many, too many, that blah blah blah blah, but never post an explanation for the neophytes or a proven, reliable method, that I know.. to dimensional a cabbage of iron.
But since you have "colto", I speak to you to speak to everyone (as I speak to nuora because mother-in-law means).
since there are undisputed skills, it would be educational and perhaps rewarding, to post occasionally one own method to solve even simple problems (simple for those who have the solution). I don't ask to unveil industrial secrets, but how do you size a deck? if you cannot and want to reveal such secrets, at least indicate the method adopted.
I'm sorry if I yelled at you somehow.
Bye.