Rhino... but WHICH Rhino?

[Joe Petrich]

Sue,

Yes it's too bad Rhino is not parametric, but then it doesn't cost an arm and a leg either. What it excels at is surface creation and versatility.

If you were to enroll in Proboat E-Training you may be able to get the upgrade from Rhino 3 to 4 for the student price, and Rhino allows you to use it afterwards for work as well. You can also get their rendering and animation plug-ins at a student discount. This may apply to Orca3D as well but I am not sure.

Good luck with the job.

Joe

[pavel915]

Sue,
Best of luck for the job, I pray for you so that you can get the job and you can come to our marine field.
And of-course feel free to ask any kind of questions here,(may be very very basic questions,,,,),,, we will be beside you,,,

[Tad]

Sue,

On your problem #1 Rhino is absolutely the answer, it is (in my experience) the fastest, most intuitive, and generally useful program out there. Rhino 4 is far better than 3 for modeling, especially trimming surfaces which you do a lot.

Problem #2 is a bit tougher....You can use Rhino Marine (Orca) to get initial flotation. Then build a simple spreadsheet in Excell to move your weights with, then enter the new centers in Orca and Rhino will rotate the model to illustrate flotation. Actually there's a weight editor in Rhino Marine/Orca but I don't use it because Excell is easy and useful in other ways...like graphing, etc.

For problem #3 Rhino is not the answer. I assume you are interested in hydrodynamic info and perhaps resistance? For this FreeShip+ is a place to start...see the thread on this forum.

[pavel915]

Sue has told that she should not buy orca3d now because if she dont get the job it will be a bad investment. so we should suggest her some alternative way. I may suggest her something:

regarding problem 2: As you can now use archemedes, you can get the position of Center of Buoyancy and center of floatation, so you can calculate the effect of changing the position of center of gravity on trim by manual calculations, so my sugession is to read some basic books of naval architecture. I recommend "basic ship theory" by Rowson and Tupper.

Regarding problem 3:
If you want to compare performance of different length and breadth and if the performance is in terms of resistance(or power), then ofcource just rhino can help you. Rhino can give you the underwater surface area, in low speed most of the resistance is frictional so wetted surface area is a great indication of total resistance, and you can easily calculate the frictional resistance by simple ITTC method. Here the other components of resistance will be a small percentage of frictional. Once you have got the surface area, you can go for diffrent methods for calculating resistanc for any speed. For this you just have to Read some good books. I recommend "resistance and propulsionof ships" by SV. AA. Harvald,

I think Books are less expensive than softwares in this case,,,,

[pavel915]

yes, as Tad said, freeship plus can help you in evaluating resistance(but please remember that one single program can not be a solution for evaluating resistance for all kind of vesesls and for all speeds, you first have to know which method can evaluate the resistance of the boat, then you have to find a program which calculates according to that method) ,,, you can export your rhino model( via VRML file) to freeship plus,

As you have worked in the field of aerospace , you might have basic principle of resistance(drag), but i hope reading some nice books like "resistance and propulsionof ships" by SV. AA. Harvald, your concept will be very clear on resistance,

[pavel915]

If you need any assistance regarding how to make a ghs file and how to use Archimedes then you can mail me at pavel@paveldesign.tk for asking me questions about that, i can help you,

You can feel free to ask questions in the forum also,

[Grant Nelson]

Sue, you might still want to try ORCA3D out. Wait for the update which will be out soon, and then you have 15 days. You can generate basic hulls in no time, since you only need test models, and then try out the Hydrostatics, performance and weight tools. While the demo is only good for 15 days, that is a fair amount to time if you focus. At least then you are working with a real tool built for the job by specialists working in the marine design trade. Also, as the other have said, are are here to help you, which should speed you along your way.

[welder/fitter]

Sue,
First, welcome to the forums!
Second, I am doing the YDS CAD course. They supplied me with Rhino 4.0, Flamingo 2.0, Penguin 2.0, and Bongo 1.0, as well as the course disk. I hope this helps with your question.
Mike

[Grant Nelson]

I guess we scared Sue away... wonder what she ended up doing..

[Sue2]

No, just biding my time, tuning my model, and realizing that the other candidate with SolidWorks Pro 2010, Rhinomarine, and a $3000 graphics computer is more desirable. I've been doing more work with layout and ergonomics (the "pretty pictures" part) since I can't compete with SolidWorks/Rhinomarine for analysis.

However, I still want to learn the Hydrodynamics side of this, just for myself if not for a paying job. I'm hoping to get my model into a reasonable GHS format and play with Archimedes, and possibly the Orca trial.

[Grant Nelson]

Cool Sue, thanks for updating us, and good luck! We are hear to help.
Cheers,
Grant

[pavel915]

welcome back sue,
And of-course best of luck for getting the job,

[gouden]

Hi Sue -

One other combo you might want to try out is either the free or charge version of delftship in combination with your rhino 3 and possibly a free drawing program - that will let you draw the lines and provide performance info and possibly at a lesser cost than the orca addons to Rhino. I'd be thinking that if you were comfortable with this you'd be able to slip into ORCA at some point in the future pretty quickly with your engineer training.

Please send me email - so we can talk further.