how to create hull

Post here for help on using FreeCAD's graphical user interface (GUI).
Forum rules
and Helpful information
IMPORTANT: Please click here and read this first, before asking for help

Also, be nice to others! Read the FreeCAD code of conduct!
natiqah278
Posts: 2
Joined: Tue Nov 20, 2018 2:05 pm

how to create hull

Postby natiqah278 » Tue Nov 20, 2018 2:56 pm

Hai,

I am final year student of Bachelor of Naval Architecture at University Technology Malaysia, my final year project need me to modelling a hull using a freeCAD. My type of vessel is patrol craft. I only have a lines plan from autoCAD for this project. I'm trying a method that sketch a line for hull using a part and part design workbench. but this method take me a lot of time. because need to do one by one body. that in case in here someone can tell and help me if there another method more fast to drawing a hull from 2D to 3D. sorry my broken english, not really good but hope can someone understand what i'm trying to say.

This example from autoCAD, but I'm using FreeCAD for this method.
https://www.youtube.com/watch?v=9t2lfWJdz_g&t=139s

Thank you, :)
joaopcrodrigues
Posts: 20
Joined: Tue Oct 02, 2018 11:13 am

Re: how to create hull

Postby joaopcrodrigues » Tue Nov 20, 2018 10:30 pm

Hello.

If you're new at Freecad... good luck. I've been forcing myself in Freecad 4hours a day for the last 2 months and it has been hell.

First off, You cannot have that approach of comparing Autocad to Freecad and expect to work the same way or the the same things. Forget about it.

My advice if you've never worked on Cad, is take the time to watch on youtube the first 10 beginners tutorials and try to replicate them. Then you'll feel a grasp of how it works and you can decide if you want or have the time to continue.

Since 'm also interesting in nautical stuff, I've taken a look at hulls
Take a look at:
https://www.freecadweb.org/wiki/Macro_Half-Hull_Model
https://www.freecadweb.org/wiki/Ship_Workbench
https://www.freecadweb.org/wiki/FreeCAD ... 0_tutorial

Best regards
triplus
Posts: 8761
Joined: Mon Dec 12, 2011 4:45 pm

Re: how to create hull

Postby triplus » Tue Nov 20, 2018 10:55 pm

Hi @natiqah278 and welcome.

In addition to what was said. If you want to replicate the workflow as seen on the video. You would use the Draft workbench.

P.S. If you would like to achieve more parametric design. You would use Sketcher workbench.
thschrader
Posts: 1422
Joined: Sat May 20, 2017 12:06 pm
Location: Germany

Re: how to create hull

Postby thschrader » Tue Nov 20, 2018 11:57 pm

@natiqah278:
constructing a ship hull with FC is very time consuming.
You can reconstruct the hull from the imported hull drawings
by using 3d splines, surfaces and sketches and some more.
Using the part and partdesign workbench alone is not enough.
And you should use the latest FC.018 snapshot for the work.
There was a long discussion in the german forum about constructing hulls.
https://forum.freecadweb.org/viewtopic.php?f=13&t=22148

The ship-workbench is not an option, because it dont work at the moment.
Do you know freeShip? It is for constructing hulls and doing the hydrostatics.
https://sourceforge.net/projects/freeship/
https://www.youtube.com/results?search_query=freeship
hull.JPG
hull.JPG (122.9 KiB) Viewed 818 times
User avatar
hammax
Posts: 878
Joined: Thu Jan 19, 2017 5:03 pm
Location: Ammersee

Re: how to create hull

Postby hammax » Wed Nov 21, 2018 8:40 am

… here is my interpretation of your Fuselage.
I used Sketcher BSplines, because they do, what hydro- and aerodynamics like most.
And I am playing with CurvesWB, especially with Gordon surface.

Designing the body inherits another philosophy than making a plan/drawing of it.

Fuselage.PNG
Fuselage.PNG (44.91 KiB) Viewed 783 times
Attachments
fuselage_3.FCStd
FC.18.15208
(176.31 KiB) Downloaded 21 times
natiqah278
Posts: 2
Joined: Tue Nov 20, 2018 2:05 pm

Re: how to create hull

Postby natiqah278 » Wed Jan 16, 2019 5:00 am

thank for all your help.. i will try and looking forward for each method and suggestion.. thank you for helping me with a great idea :)
User avatar
hammax
Posts: 878
Joined: Thu Jan 19, 2017 5:03 pm
Location: Ammersee

Re: how to create hull

Postby hammax » Sat Jan 19, 2019 10:29 am

… concerning your PM:
A solution with CurvesWB and Gordon surface of the GorchFock hull quickly reworked.
That's a way you can do hull construction.
There are some other/new benefits in CurvesWB to use.
https://forum.freecadweb.org/viewtopic. ... 61#p280989
The attached file still isn't on the latest "state of the art"!!!

GorchFock_H4.PNG
GorchFock_H4.PNG (35.16 KiB) Viewed 558 times
Attachments
GorchFockH_4.FCStd
FC.18.15656
(85.83 KiB) Downloaded 17 times
triplus
Posts: 8761
Joined: Mon Dec 12, 2011 4:45 pm

Re: how to create hull

Postby triplus » Wed Jan 23, 2019 6:25 pm

Thanks for sharing the solution outside "PM".
User avatar
hammax
Posts: 878
Joined: Thu Jan 19, 2017 5:03 pm
Location: Ammersee

Re: how to create hull

Postby hammax » Mon Sep 09, 2019 7:29 am

… latest ocean racers for vendee globe in 2020.
https://www.sail-world.com/news/221708/ ... -six-weeks
Trying to redesign them from pictures: http://no-frills-sailing.com/next-gen-i ... ht-charal/
Just for fun and our French FC-friends (scale 1:10)

Charal-60-imoca_3.png
Charal-60-imoca_3.png (40.79 KiB) Viewed 183 times
Attachments
IMOCA60_2.FCStd
(385.21 KiB) Downloaded 6 times