Starting delftship: taking design changing …

[Gerd F. Berges]

Sure the free version is for trial and training, so printing and plotting are not included.

But first I need to understand how it works and I have some little little experience in vector drawing in graphics with bezier curves, but only in 2D.

I want to design a not planing hull of about 15 x 5 meters and and research prototype of 10 meters length and 2,50 width to have an acceptable hull speed and no transportation problems in Germany.
And I want to try some new plate/sandwich materials and DIY to reduce costs. So any smaller hull would be not suitable.
And because of different elements there would not be a library of such things in delftship.

But because I have looked around and not founded any suiting expert or company I have decided to develop by my own – knowing nearly nothing or a little bit more. In addition here every is english and this is making my understanding more difficult.
Questions like perfect aquadynamics, hull stability are additional problems, but to be solved later.
It is research vessel. And the measurements are simple constructed vessels in the market, what are constructed nearly out of tubes …

So I have taken one existing file made from plates from the library and changed it a little by transforming (scale) simply.
With first some effects like paintings of Dali I have got the attached result.
Now not being sure if all modifikations will be good for aquadynamics, but done for simplification and reducing draft …
And it is not so suitable that working with window in full screen there is no scrolling availiable to work more precise in details.

Concerning this result I like the simplicity of only 3 stakes per side or 6 at all. Such is interesting because of usual quantity of welding.

Basic condition ist to have the professional version of delftship.

First problem would be to find a paper plotter wider than 90 cm or a company to be able to plot directly the surface material HDPE.

Second problem would be to have the needed ‘spant’ (netherlands/german) design to have a defined diameter/form at every (half) meter length.
How it is possible to plot the’portside-starboard-cuttings’? Could there be numeric control of bending machine to make some tube ‘spant’?

Third problem is coming up when the basic hull has to be reinforced by ‘spant’, floors/ceilings und walls: Are there any hull water pressure, crash or torsion simulation tools? What is happening by contact of front ‘steven’, keel, hull sides with ground, ‘sluis’/ecluse/watergate? etc.? What is with waves?
Could the program suggest where are the highest structural dangers and how the reinforcement grid should be designed?
So the grid of reinforcements should be totally done in mind and by experience, trial and error?

[file name=PE_KlassikRumpf10mtrail1.fbm size=3968]http://www.delftship.net/delftship/media/kunena/attachments/legacy/files/PE_KlassikRumpf10mtrail1.fbm[/file]

Attachments:

• Gr____en__nderung_PE_KlassikRumpf10mtrail1_Linesplan.jpg
• PE_KlassikRumpf10mtrail1.fbm

[Gerd F. Berges]

… such would be more difficult in questions of torsion and draft, but easier to be handled in relation to inner hull stability.

Are there any information concerning aquadynamics?

Sure there are rules concerning the free space between the two hulls of catamataran, but in general concerning sailing catamarans, because the water could not ‘squirt’ away …

Could a ‘semi-catamaran’ with double sequent propellers in the middle not be defined as jet drive?

[Gerd F. Berges]

attachment didn’t work before because I have forgotten to transform to jpg.

Attachments:

• Gr____en__nderung_PE_SemiKatRumpf15mbeta2d_Linesplan.jpg

[Gerd F. Berges]

If somebody has suggestion, design … feel free!

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