Marven

[Marven]

3 things come to mind:

1. Are there leaks points submerged for the selected draft? This can be verified by calculating hydrostatic for the same draft.
2. Did you set the correct draft?
3. Is the speed range withing valid boundaries?

Can you perhaps include a screenshot of the resistance window with your settings?

[Marven]

Terrance is correct. By default values on port side (PS) of the vessel are positive while on starboard side (SB) the values are negative. The setting can be used to switch this.

[Marven]

Theoretically the lateral area is the projected under water area as seen from one of the sides

[Marven]

These are not in the report presently.

[Marven]

That feature has indeed been removed. You could probably still use an older version of DELFTship (version 12 or learlier) to import these files

[Marven]

The free version only calculates resistance (not speed) for sailing yachts or canoes.

[Marven]

This feature has been moved to the “Home” tab.

[Marven]

Hi Juan,

 

The bottom of your hull is 0.77 above the base line, while the design draft is 0.6 above base. This means for the design draft the waterline does not intersect the hull.
If you did not intentionally model the bottom 0.77 above the base line you can use the “Move to base” button from the “Modeling tools” menu group on the “Tools tab” to automatically move your model to the correct height.
Do not forget to check your draft in the project settings afterwards.

 

[Marven]

Hi Axel,

 

Would you be willing to share the original image so we can check on our systems if it works ok?

[Marven]

Hi Paul,

First question is easy: Reference images can be hidden by clicking the “Background” button which can be found in the “Hull display” menu on the “Home” tab. This shows/hides all enabled reference images. In addition you can hide or show individual images by clicking on the lightbulb which is displayed on top of the image in the menu.

Secondly, if you have removed the old stations and added new ones in the “Intersection” window then the new positions should be used in the linesplan (and 3D views).

[Marven]

Hi Axel,

13.000 pixels is rather large indeed, and I think your OpenGL card cannot handle it. I don’t think it’s a DELFTship issue, unless the image is also not shown correctly in the reference image editing window?
Perhaps you can try the following and let me know if it solves your issue:
1. Open the background image but do NOT let DELFTship resize it.
2. Select the “Edit” tab in the reference editing window and press the “Resize” button.
3. Reduce the width to 11.000 pixels and check if the image behaves correctly. If it doesn’t try to make it even smaller until it does. 8.096 might be a particular interesting value to look at.

[Marven]

The idea is to create a set of edges running aft to front of the boat. By selecting these edges and converting them to “crease” edges you effectively create a hard corner from aft to front. By using 2 sets of edges on the same vertical height you can create a spray rail.

See also the image below from the manual/help.

Attachments:

You must be logged in to access attached files.

[Marven]

Hi Axel,

I can use background images on our system without any problems that are 8000 x 8000 pixels in size. What size is your background image?
Could it be that the size of your image exceeds the memory size of your graphics card (or the maximum format supported by your graphics card)? Please bear in mind that the size in memory in bytes is:

image width x image height x 4

Usually this is considerably larger than the file on disk.

[Marven]

Hi Axel,

 

The warning you are referring to is shown when the image is larger than 2.5 times the screen width (or height). The message is nothing more than a reminder that the image is large. If you press “Yes” then it is downscaled, otherwise the original image size is kept.

[Marven]

The the only reason I can think of is that you do not have any surfaces created.

Can you post a screenshot of your model including a view of the project main dimensions?

[Author]

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