Modelling a flat bottom chine tug hull (WWII TID)

[Paul]

Hi all

I want to make a steel model of a wartime TID tug. I would like to draw up the hull and export the frames and developed skins. Skins have no compound curves.

I tried loading lines drawing but I couldn’t find anything in the manual to fully explain how to pick up the shape. Also the manual mentions using three drawings but no instructions on how to do that.

Alternatively I see I can load a .txt file to import the keel profile and chines – but no mention of the format, unless I missed something…

Any ideas welcome. I can draw a set of hull lines by hand and I can do CAD (mainly 2D steel work)  but this has me somewhat frustrated – and it’s too hot for that right now!

Regards

Paul

[Hrvoje]

Hi, Paul!

On page 29 of the DELFTship manual, you have the format of the text input file. It is very well explained what means each row and column of the file.

Have a nice day!

Kind regards, Hrvoje

[Paul]

Hi Hrvoje

I have finally managed to get back to this project…

I don’t have a full set of offsets. I just have offsets for the chines and sheer. The bottom of the hull is a flat plate so there is no ‘keel’ as such. All the plates are flat – no compound curves or conic sections as far as I can see.

Is there a way to model this?

Regards

Paul

• This reply was modified 6 months, 4 weeks ago by Paul.

[Terrance Egolf]

Hi Paul,

Do you have a set of 2D scaled plans or a diagram of the hull you are trying to model that you could attach to a post here? It might be easier to suggest an approach to getting your hull into DELFTship if we can see what you are working with.

If you would prefer to send a private message, you can contact me at txtbkauthor [at] gmail [dot] com.

Terry

[Terrance Egolf]

Hello, Paul.

It sounds like you are asking for some assistance in setting up background images for your model. Are you working from pre-existing plans or are you wanting to create your own plans from WW II images?

I will provide you five files constituting a tutorial for setting up background images in DELFTship Free. I originally created these for my fellow members of the Model Ship World forums. Hopefully, you will find them useful.

The only detail I know I have omitted from the tutorial is that, for intersections to be visible in a model file, you must check “Intersections” for the layer(s) in which a particular intersection can be visible. This selection is made in the Edit window of the Layers Menu Group. Generally, if you make intersections visible for the entire hull itself, then they should be visible for the purpose of aligning any of the background images for the model.

The first four Tutorial files are attached here. The fifth file is in the next post (forum limitation).

Terry

• This reply was modified 10 months, 2 weeks ago by Terrance Egolf. Reason: Added content

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[Terrance Egolf]

Here is the fifth file. Please read the first PDF. It includes all the appropriate attributions and disclaimers for this tutorial. I take responsibility for any errors or inaccuracies, since these files were written more than a year ago.

Terry

 

• This reply was modified 10 months, 2 weeks ago by Terrance Egolf.

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[Paul]

Thank you gentlemen, you are very kind.

I will have to dedicate some time to learning this package properly. I was expecting it to be easier…

Have a great day

Kind regards

Paul

[Paul]

Hi Hrvoje & Terry

I have another question if I may?

Given that I would like to export developed hull surfaces and perhaps frames/sections, should I model the vessel at full size and ‘scale down’ to 1/16 or should I model it at ‘model’ scale? The full size is 65′ between perpendiculars so say around 70′  (about 21m) or a bit more overall. The model therefore should be around 1.3m.

I was wondering if the calculations will still work on such a tiny hull? I would be interested in displacement so I don’t build too heavy and also stability and everything else out of interest.

I love this stuff – frustrated naval architect here… I could draw a set of yacht lines when I was in my early teens (back in the 1970’s), nowadays I run a Bavaria 38 sailing yacht as a business based in Southampton, UK. Hoping to expand to the Spanish coast next year, maybe Barcelona if all goes well.

 

Kind regards

Paul

[Terrance Egolf]

Paul,

For modeling from existing drawings or dimensions, I’d go with using full-sized dimensions, since things like the waterline and draft are already known. Also, you can use positions and dimensions in full-size units right off the reference drawings instead of having to calculate the scaled quantities.

If you are designing your own hull and those characteristics are not known, then you would probably  still  want to go full-size so you can use the program to determine them. Trying to do hydrostatic calculations for a 1/16 scale model would introduce all kinds of errors due to the mismatch of scale between desired model dimensions and the actual properties of water used to perform the hydrostatic calculations. I’m not a naval architect, but that would seem to be a problem.

Terry

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