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TOPIC: Thickness and weight in "Design hydrostatics report"

Thickness and weight in "Design hydrostatics report" 3 weeks 4 days ago #5779

  • iosif
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Hi
Can't figure out how to get thickness and weight in the "Design hydrostatics report"

I defined mean thickness at Home/Project settings/Hydrostatics/Mean shell thickness as 6 mm but in the report under
"The following layer properties are calculated for both side of the ship"
I am getting: Area; LCG; VCG
Not getting: Thickness; Weight; TCG.

Where I suppose to assign thickness and weight of the material used as it will be much different using plywood, steel GRP epoxy-glass or some sandwich.

I can calculate the weight manually as I know the weight of the plywood with epoxy glass I am using but it will be nice to get thickness and weight in the report :)

Best wishes
Iosif
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Thickness and weight in "Design hydrostatics report" 5 days 12 hours ago #5800

  • iosif
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I read over the manual but I didn't find answer to my question.
Maybe Maarten or Marven can tell me what to do?

Best wishes
Iosif
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Thickness and weight in "Design hydrostatics report" 4 days 11 hours ago #5802

  • Icare
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I assume it's because Delftship was conceived first to design ships, before building them. Knowing the weight and center of gravity is useful to balance the ship, and this must be done before cutting the planks.
That's why the report is called "Hydrostatics".

I assume there are two solutions to your problem for the next versions:
- either to include the possibility for the user to check boxes to set the report content;
- either to include a definitely new kind of report called "planks list" or something like this.

As far as I remember, you have the data you want in the LAYERS dialogue box. Maybe you can make a screenshot of it...
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Thickness and weight in "Design hydrostatics report" 3 days 23 hours ago #5803

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Hi Icare

Thank you very much for the answer. I was thinking that I am missing something substantial in using Delft Ship :)

I am using Delft Ship to design small boats and building them from plywood covered with fiberglass.
The easiest way to build them (for me :) , I am using stitch and glue technique now) is by making an external jig so for example if I am using 6 mm plywood the boat shell is bigger by 6 mm.

Telling the truth, I don't know how to use the LAYERS dialogue box (shame on me :( )

What I have done is made a new .fbm bigger by 6 mm. It come out that the displacement on a 3 meter boat is bigger by 3 kg.
Regarding weight and CG, I succeed to make the designs in a way that the weight for and aft from the LCB is almost equal.
The bigger boats are scale-up of the smaller ones so it keeps the proportions.

I will continue with this approach if Delft Ship will not take in consideration weight and shell thickness.
Maybe someone else will find also useful my primitive approach

Thank you again
Best wishes
Iosif
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