Full Version: Lofting a boat hull.

Show messages:  1-14  15-34  35-54  55-56

Thanks Tim. I am indeed very familiar with lines drawings. I'm a professional modelmaker and specialised in yacht models for various well known designers. I may be having to do a model of a tug and a barge for the owner who is having them restored to a luxury level. I was hoping to transfer those skills to MOI and set up the lines in exactly the same way as I would make a plank on frame model and then get it made on a CNC router. All is good until I discover you can't sand bits to shape very easily!

---

HI, I'm developing often hulls and boats, and the lines plan are god for building and not for modelling, for a better result I use a few sections and a network surface, or a 2 rail sweep.

And other thing consider only an half boat when you make the model, is bit complex making the keel and hull both in one surfaces.






Here a simple Dinghy made with loft.. but in IGES, the Moi version has no more sections.

---

Hey Anthony,
Still here!!! I got cancer which set me back a bit. but still around.

"Got his head bit off"

Well, mostly my own doing. You are touching on some of the points here. "Accuracy", "the real world"...

I found though that it starts to encroach on someone's process, and can feel offensive. So have been working at avoiding "philosophies".

Your prop was a fun project. You were open to changing your process to get a result. In the REAL WORLD, big Ship prop makers for instance, have a highly paid, experienced guy, with a GRINDER in his hand, working and balancing the part. after it is manufactured.... lol

Cant really do "Accuracy" from a 2d drawing, most likely downloaded from the internet. A REAL ship drawing would be far more intense. Filled with math.

So, here when we talk about accuracy, I believe we are talking about "How much time are we willing to put in"... REAL models can be YEARS in the making. Down to the PATCH, bolstered by mountains of math and supporting files for each patch...

Michael already posted a link to a thread where I discussed with a guy his ship model (Mark Brown). He ended up making some beautiful stuff. I think he worked on it for "MONTHS".... The idea that a few curves and a loft to generate an entire hull, is reaching.

My suggestion in his approach would be the same here. Model your curves as "Waterline" instead of station. In a real world ship build, the stations are just a means to create the waterlines, which ARE the design of the ship....

But I would have to tell the OP to scrap all his work, start over and work for months to generate the design... So just gracefully getting across Michael and Barry's points and methods, are good. Being stuck on "The accuracy and this drawing", is a no win.... Allowing in "Loose loft" methods, and adjusting for that, really goes a long way.....

---

Hi Burrman,

Damn, really sorry to hear about getting cancer. That's terrible. I hope you are able to beat it.

Yeah, the mountains of math is the hard part. I'm still finding bugs with PROP_DESIGN. I started with a code called PROPSY, thinking I could scan it it and it would just work. Damn, was I wrong. 10+ years latter and still pounding on it. You helped a lot with figuring out the leading edge was an ellipse. That was not clear at all from the NACA definition.

At various times, I asked if a script could be made to automate the geometry creation process. Some progress was made but don't think a finished product was posted. However, that helped me find some important bugs as well. So it was helpful.

Yeah, I hear you about forum posts regarding accuracy. A lot of the work flows that seem to be popular aren't something I could use. Even a loose loft is not an option. So I just kind of shut up as well. Just easier that way I guess. Plus I saw what happened to you. I couldn't stand that guy either. Naming lofting after himself. The arrogance was unbelievable. Yet he was a popular user. So that left me pretty dumbfounded.

I started with a 2 rail sweep using 1 profile. I ended up finding out Rhino was screwing up the geometry. Even small deviations had big impacts on stress and vibration. You would be surprised what a small deviation can do. Eventually I figured out lofting with multiple profiles was the best way to go in my case. That ensures the aero and structural performance.

Anthony

---

Hi Burr, that really sucks about the cancer. I sure hope that you'll get rid of it.

- Michael

---

Hi Michael and Anthony,
Yeah, an out of the blue punch in the gut....

But, it seems to be gone for now!

The treatment was brutal though.
Lucky i didnt post while on morphine!!!! Lol

Making my comeback now. See you in the funny papers

---

Hi Burr, sounds like a rough time but I'm glad you're on the upswing now.

- Michael

---

Thanks again Michael!!

Really appreciate your forum and community...

---

that's great news, except for the horrible treatment. you reminded me of the beginning of the movie shallow hal. the kid goes to talk to his father who's high on morphine. tells him a bunch of crazy but true sh** that changes his life.

---

Hi Burr!

Some minutes ago I read your posts:

"Still here!!! I got cancer which set me back a bit. but still around."

"The treatment was brutal though.
Lucky i didnt post while on morphine!!!! Lol"


It's really sad to hear these really bad news!
So sad...

But I understand from your words that you're a "fighter" :)
This is a very good thing for you!

I hope all the best for you and your life.

Have a blessed day!

---

Hi Marco,
Thanks for the nice words! On the upside now, so back to it....

---

Gord had a nice thread going here...

Didnt really mean to derail it...

Onward!

---

Hi Burr.

I'm sorry...but English is not my native language :)

I tried to translate your last post, but I couldn't do it:

"Gord had a nice thread going here...
Didnt really mean to derail it..."

Is it figure of speech in English/US?
What does it mean?

Thanks :)

---

Hi Marco,
I dont want to change Gord's post "lofting a boat hull" into "Burr got sick" post....

And also, "Thanks for the kind words"....

---

Ah...ok!
I should have known by myself...

Thank you very much for the clarification.

And...Have a blessed day Burr!

Ciao :)

---

Burrman the return of the new year ... always pertinent! ;)

---

Happy New Year, Frenchy!

---

Is Freeship available for a Mac please?

Gord

---

I am affraid that you must run it on MAC with "emulator"(?) ...like the free PlayonMac (someone use Freeship with success )
https://www.playonmac.com/en/
Good luck!

Ps That must maybe run also fine for any other program like the free PolyCad ;)
http://www.polycad.co.uk

---

https://download.delftship.net/DSFree.php

and with a very big detailed PDF! ;)

Else seems this ones are for MAC! ;)

http://www.touchcad.com not sure that is something free here :)
maybe the demo! http://www.touchcad.com/tc3download.html

http://www.jsdn.es/jSDN/en/mainframe.html

maybe this one (not tested) https://moiscript.weebly.com/uploads/3/9/3/8/3938813/jar.zip

---

Show messages:  1-14  15-34  35-54  55-56