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Boat design for multiple water line  


td_ipak
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I had watched the hull design intersection technique and really enjoyed it. I am currently working on a speed boat with multiple water lines. Few water lines are connected to the front bow and some are not connected to the bow as shown in the attached figure.
please give me some insight, I want to control waterline by either joining it to the front bow or leave it as shown in figure without disturbing my loft and front hull shape.

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Benk
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Hey @td_ipak,

It shouldn't be that complicated. You need to create the base hull first and close it (create a body). Then you can create the waterline as new bodies that you will combine with the base hull.

Start with creating the base hull first and when you are done, attach the file and I'll show you how to do the rest.

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td_ipak
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@benk
Thank you for your reply.
Here is the link for the model, it's so basic that if you have a suggestion please let me know.
https://a360.co/3b96O8t
and I have attached a few photos of mold for your reference.

pS don't mind other things in the mold. 

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Benk
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@td_ipak,

Here you go, I have attached the video with the technique. I hope you will like, you could do all kinds of cool stuff with it.

I think I'll make another video for YouTube.

 

 

 Cheers.

 

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td_ipak
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@benk
I don't know how to that you but I am really really grateful for your help. I am actually new to fusion so I literally invested my entire week to design the hull but still, I was struggling. Though the time investment really boosted my CAD skills, and I will continue this hard work. It's really really nice to get the exact help what I needed.
I will soon post my progress here.
Thanks a lot. 
And waiting for your youtube video.
Thanks.

 

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td_ipak
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@benk
Hello benk, I tried your technique on a simple hull and it worked perfectly. For now, I am trying to do the same thing on my hull but sadly I can not thicken my hull skin to the required thickness, which is 1 inch in my case. I have attached .f3d file below. 
Please check the file and suggest me any techniques to convert it to solid model, or if there is any other way to construct a solid model for the same type of hull.
P.S I want to build a boat from the hull so it is really important for me.
Thank you.

 

https://a360.co/38DvXpO

 

 

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Benk
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@td_ipak

There is one thing that people forget to take into account when they try to use the Thicken tool and that is the Actual model size!

So, you need to make sure your model is big enough for 1 inch. If it's too small, you'll never succeed.

The next thing is sharp corners or extreme angles, which could also cause issues with the thicken tool.

Have you tried other thicknesses? like 0.1 or less?

 

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td_ipak
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@benk
Yes, you are absolutely right. My hull contains sharp angles. As I had already mentioned I want to work on the existing hull so it contains those sharp angles.
And regarding small thickness value, yes it works if I give thickness value like 2-4mm but I need at least 10 mm.
So, fillet would work?
Please check my file and suggest whatever flaw you see.

 

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Benk
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@td_ipak

The best solution is to resize the model (Scale it up). It will save you a lot of trouble and extra steps to create the right thickness. That is also what I usually do, I always make sure that my model is big enough or I use real-life measurements.

If you are going to build this boat, then scale it up so it fits the real measurements and you will see a big difference when you will use the Thicken tool. 

Please let me know if it works, if not then I'll find another solution.

 

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td_ipak
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@benk I hope the dimensions are similar to the existing hull mould. So scaling dimensions would only deviate me from making a 3D model which is similar to the existing model.
I want you to understand in this way: I am doing a reverse engineering design- dimensions that are taken in the sketch are somehow close to the existing product.
So please suggest me any other ideas

 

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Benk
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@td_ipak

I turned it into a closed body and as you can see in the picture, there are some places that are not flat and with a sharp angle.

You need to fix those areas first and then you will be able to do the thickening.

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td_ipak
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@benk I tried to fix that with guidelines at the end. It worked in case of upper lofts, but when I try to give guideline to the middle loft(guidelines at bow and stern) it gets bend.
I left the middle section as it is and tried thickening with 0.05 inch, it still does not work and gives an error like could not solve the geometry.
please review my files and make any changes to make is solid.
https://a360.co/38DvXpO

 

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Benk
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@td_ipak

Don't use the thicken. Close the top and the back, but before you close the back you need to make sure that it's straight, so might need to do some cuttings like I did.!

Then after you stitched everything together you will have a solid body and then use the shell command. I managed to create a shell of 0.5 and that was with the previous file.

Let me know if it doesn't work for you.

 

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td_ipak
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@benk Noted with thanks,
will try and reply.

 

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Benk
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@td_ipak

I have another idea... Do the top section later, this way you won't have to deal with all the angles challenge.

 

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td_ipak
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@benk I made the surface body solid, but I put the last(stern) side to angle (as it was). Now when I try to shell it with internal thickness 0.5 my fusion crashes.
Uff I am frustrated now >_<
https://a360.co/3bC1QBh

 

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Benk
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@td_ipak

Here is my feedback video:

 

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td_ipak
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@benk Thanks a lot. I will try this technique and reply you. For now i am taking a break, thanks ?

 

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td_ipak
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Hello @benk 
I idea seems to work.
I started with a well-defined sketch and followed steps as shown in your video (Intersection Techniques). I got a straight skin, I closed the profile, converted to solid and shell it and I even tried to attach waterline as you had taught me.
During this process I got 2 problems:

1. During the first loft- My loft did not connect to bow, the curved line- it remained straight at the front and when I tried to give the curve line as a guide rail, it got bent. So I left the straight edge at the front as it is and started working further.
(Please check my file see what's wrong or how can I make it better, curve in the front)
2. I created a solid waterline at the bottom at different plane angles, 0-15.7 and 164.3 but none of them combined with the hull body. It resulted in inconsistent edge or face.
So once again I request you to go through my file and check what is I am doing wrong
Also, be sure that your every reply has taught me new techniques every time and I am so grateful for your help.
https://a360.co/3byd8Gy 
If these two problems get solved I think I have a concrete concept with various techniques to create a good hull.

 

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Benk
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@td_ipak

I'm not sure regarding your first question. You will have to create a screencast and show it to me.

Regarding the second question, to solve the edge issue, use only one Rail and you will see that the profile looks exactly as it should.

Ps.

You could use this tool to record your screen: https://screencast-o-matic.com/screen-recorder

 

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td_ipak
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@benk

 Here is the video, I hope you understand my question

 

 

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Benk
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td_ipak
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@benk Ohh, now I understand another major issue I was facing. I thought I sketched on the origin in a symmetric way but I was working on the hull component origin, not on the root component origin.
Actually, I tried the patch tool, but the patched surface was created away from the body, now I understood the reason.
Now I will create a constrained sketch with little upgrade in the front curve and I will surely require your guidance to push the remaining sketch to front curve.
For now, I am going to take a break.

Thank you.

 

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td_ipak
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@benk Greetings from Nepal.
I have attached the file link and a screencast for my further queries.
Now I want your help regarding how to push the remaining destination sketch to the front bow.
I have a little concept from your waterline combining technique but I think its really good to hear your idea and step further.
Thank you

https://a360.co/38zzohA

 

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Benk
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td_ipak
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@benk I tried, I tried with a different profile, even tried once with inner and another time with the outer edge as a guide rail but every time it resulted in self-intersecting loft.
During that process, I even found out another issue that my lower loft was not short so I went back in sketch and identified some flaws there.
So with your help, I am now capable to analyze what's going wrong.
I also built a concept of self-intersecting like why it happens though I could not solve it.
I have attached a photo that would explain what type of profile I want in the front plane, I tried exact same with my model but I could not make it.
See If you can solve this.
I will send a more refined model with constrained sketch tomorrow morning.

 

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Benk
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@td_ipak

Please let me know if that's the end results you are looking for:

I have attached the file so you could reverse-engineer what I did. If it's not clear, then I'll make you a video. 

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td_ipak
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@benk Wow, it's really nice and the techniques you used really astonished me.
Now I have a query regarding how to maintain the overall length of the boat. I want it to be 408inch long. I draw that 408 inches initially so in order to push that side profile we had to draw another profile at the front side right? So, it just added to my entire length. So what would be your suggestion or approach to maintaining the length of the boat?

 

 

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Benk
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@td_ipak

If I were you I would do this:

  1. Finish the boat hull and make sure that everything is proportional.
  2. Then you need to decide if you are going to use this boat to create the mold or is it going to be the actual final boat design!
  3. Moving on, you can use the Scale tool to get to the desired length and size of the boat based on your desition above, mold or not mold?

So what I'm trying to say is, the final measurements are not important right now as long as the current measurements are proportional. Because in the end all you will have to do is scale it Up or Down accordingly. The Scale tool works with percentage (%) and not with inches or cm.

Option Nr.2 - when you are done with this file is to start a new file and rebuild everything from the ground up with the right measurements and use all the great techniques that you have learned so far. 
Everything we have done together until now, is to figure out how to create different features and now that you know, it all about rebuilding it with the final product.

Ps.
Are you going to build this boat for private use or business? I'm just curious ? 

 

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td_ipak
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@benk Firstly sorry for the late response. I was stuck with some of my personal work.
Thank you for the scale concept, I dived into that and buildup some thoughts about it.
And regarding the purpose of this thing,
I want to be honest with you and share some background.
I am from Nepal which is a landlocked country filled with mountains. And the major thing to share is we are rich in water resources/ rivers. 
Saying that we lack road connection in rural areas so I believe waterway would be the best method to connect those rural areas in an effective manner, in terms of time and cost.
But again saying that Nepal has only one boat building company, which is established a year ago.
And talking about myself, I am a fresh Mech Er and interning in this boat building company.
But the fact is this company has literally zero R&D and there is no one to mentor me. They have somehow managed to build a mold, I had shared photos with you and we are making the same sized speed boat again and again.
So, I am here with my interest to learn boat designing and develop my CAD skills.
That's it, For now, I want to design a complete boat (our existing speed boat). since we(you and me) have almost completed the hull, the upper deck looks very simple with minimal curves.
Yeah, that's the background.
Let me know if I can help you with anything from my side.
And as usual, I have attached a video with some issue, please help me.
https://a360.co/325tTVt

 

 

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Benk
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@td_ipak

Is that mean that until a year ago all the boats were imported?

Don't worry, I'll do everything I can to help you guys!

 

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td_ipak
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@benk There were no engine assisted boats one year ago.
it is totally new here.
Thanks, I will check the video and reply

 

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td_ipak
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@benk Hello,
Thank you for all your assistance,
I added waterlines, ribs and floor, combined it all.
It all worked very nice.
Now, for a few days, I am going to practice some other stuff using all the techniques you taught me and come back to finish this boat.
Thanks,
I am sure that I will require more assistance from you in the coming days. In that case, I will continue posting here.
Till then, Have a good time
And once again, thank you very much.
It would not have been possible without your help.

 

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Benk
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@td_ipak

Please don't forget to attach the file. I would like to see what you did and your progression.

 

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td_ipak
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@benk Hello and how you doing. Sorry for the very late response, I was travelling some rural areas of Nepal so I could not reply you.
I have attached my file here.
Please don't get angry because I have done whatever I liked, that's why my timeline also looks a mess.
Soon I will rework on it and send you a cleaner version of our boat.

https://a360.co/3aITI0w

 

 

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Benk
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@td_ipak

Don't worry, I'm not angry because I know you know what to do! ?

Great work on the new bodies. I look forward to the cleaner version and don't forget to get in touch if you have any questions.

 

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td_ipak
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@benk Thanks, I will reach you with a cleaner version soon.

 

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td_ipak
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@benk Hello benk, Looks like I am reaching nowhere without your help 😀
I wanted to make a cleaner version of the boat. Starting with the hull, I first made a simple piece and added side parts as per your suggestions earlier. But I am facing a little trouble during shell command. I have attached the file also and waiting for your reply.
Thank you. 

https://a360.co/2xA3V14

 

 

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Benk
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@td_ipak

Few seconds are cut in the end, but it's not important. I have also attached the file, but use your own for the final work!

 

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td_ipak
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@benk Thank you.
Fillet worked completely ok. Now I am gonna work on waterline line and further.
I will post as soon as I complete my work.
Thanks once again.

 

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td_ipak
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@benk Hello benk, I have attached, please review it. Also, I have attached a video to explain an issue on my 2D drawing. 

 

https://a360.co/3aXSqPe

 

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Benk
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@td_ipak

Like Joints, Drawings rely on Components! Which is why it is very important to structure your model correctly, where every separate part = a Component.

I'm not quite sure why you are getting this artifact, but you need to make sure that what you want in the drawing is divided into components.

 

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td_ipak
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Benk
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@td_ipak

I'm just checking if everything is ok?

 

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Benk
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Hello my friend,

It's good to hear from you and that you are well😁 What's going on with your boat development? Is it almost done?

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td_ipak
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Hello brother
How you doing?
I am sorry i had gone for a long.
I am doing fine with the designs now maybe because i am not doing it much now, haha
We are here in a complete lockdown so i was unable to attend my office
How things are there?

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