Eric Bailey

[Eric Bailey]

Yes, changing it back to midship = halfway APP and FPP fixed it.

What is the purpose of being able to change the setting if it causes these problems? Note that I always worked – manually – with the midship as base … so when I saw it could be changed to that …

thanks,

Eric

[Eric Bailey]

one shows the body plan with “both sides’ turned on and the control net – the other shot shows the same same with “both sides” turned off …

[Eric Bailey]

Hello anyone from DELFTship… how about a different take… my original questions.

Any suggestion for using DelftSHIP? Is this even possible in this software?

I have attached a sample of my design… refer to post above.

thanks,

Eric

[Eric Bailey]

I don’ know if my experience covers this situation but – wouldn’t using imaginary waterlines where the hull is not – give you imaginary coefficients?

I take it upright the hull DWL ends just before the hull does? Is there a reason not to extend the hull? You would get a little better flow I would think…

Also, I wonder if the heeled coefficient thing is a new fangled idea coming from designing in a computer? I never bothered with it back when I designed a couple power boats manually… of course they were power boats…

I am really curious to see what others think of this – good luck.

Eric

[Eric Bailey]

True, it was very common when, for example, they used to design a hard chine boat for traditional plank construction to use straight or concave lines in section eg. Seabird.

Of course the point of this is to design the sailboat I want for construction in plywood. This would mean using conic projection or a variation on it – which as I understand it would always result in hull sections with some degree of convex curve between the chines.

In other words a developable hull.

I have attached an early version of my design – as you can see the sections are concave between chines. I have spent a fair bit of time trying to find a work-around… nothing I have tried will allow easy addition of these curves where I want them in section. Mainly in the bow of course – although a small convex curve is usual throughout the remaining sections.

DELFTship

thanks,

Eric

Attachments:

• DRAFT-CHINES-006c.fbm

[Eric Bailey]

Hello… anyone with DELFTship have any comments?

thanks,

Eric

[Eric Bailey]

Hello,

I am not sure what you mean – however letting ease of construction or some other arbitrary factor dictate hull shape is not the way to go…

In other words if the planks are straight you have a Kleenex box shaped boat!

[Eric Bailey]

You have three options: create an image, print it and the best bet if you have a drafting program that can read a DXF file – export as a DXF (data exchange file). I don’t use the create image or print option so can not advise on how to use them.

You access these options through the “Tools” tab and the button “Show default linesplan”. Turn off the fill colour and lights so you just have the lines…

[Eric Bailey]

Professional has automatic fairing – which is good – but it also takes practice to get the shape of hull you want and have it faired automatically.

[Eric Bailey]

OK, I see what you mean. When I export a DXF file from DelftSHIP it is only one file. When I open the DXF file in AutoCAD everything is in the one file – no problem.

I don’t know what could be causing it. Are you using an older version of DelftSHIP?

I would hope in your drafting software you could combine and scale the separate DXF files but you shouldn’t have to.

Anyone else have any ideas?

[Eric Bailey]

I am not sure what you mean – what measurements don’t match what other measurements?

What does “measure length based on buttocks” mean?

Did you mistype a number in your description above?

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