Gene-Hull Sailboat new version 3.5 and its post applications Gene-Stab and Gene-VPP

I am pleased to propose you this new (and probably last) version 3.5 of « Gene-Hull Sailboat » and its post applications Gene-Stab and Gene-VPP , free applications dedicated to the early stage project of sailboat (keel boat, daysailer, cruiser, racer).

This new version 3.5 includes some improvements, like :

** for the sections generation : an upgraded formulation (still using the same input data) with more output data proposed for a better mastery of the angles and curvatures,

** for the heeled hull : more output data to check its relevance, e.g. the line connecting the centers of the immersed sections areas which is a bit like the spine of the heeled hull,

** for the post application VPP : speed table and polar are possible output

** + other minor improvements or bugs correction detected by practice or by users,

** and last but not least, User Guides partially rewritten for more clarity

For the beginner of Gene-Hull : it is recommended to first test the influence of each adimensional parameters, with using the boat V1 example in place without changing at first the geometrical data : it is easy to do (just to change the value of one parameter in its cell), to see the influence of this change on the hull drawings and on the hydrostatics output, in conjunction with the explanations given in the User Guide, and doing so to learn with a soft slope.

For the more advanced user : you can take advantage of one of the 24 examples showed in the « Examples » document, of which input data are stored in the « Hulls storage » sheet , to start a new project.

I remind you that they are free spreadsheet applications developed with OpenOffice Calc, and dedicated to the early stage project of sailboat (keel boat, daysailer, cruiser, racer).
It is a free and open source speadsheet application, developed on a support itself free and widespread (Open Office Calc 4.0.1) : to open and use an ods file, you need either Open Office or Libre office on your PC, if necessary to download according to :

• 
  ODS File Extension - What is an ods file and how do I open an ods file? | OpenTheFile ODS File Extension - What is an ods file and how do I open an ods file? | OpenTheFile http://www.openthefile.net/extension/ods
  

By hoping this upgraded version can be helpful for your early stage projects. Just try and enjoy !

 

Hello,
Do you have version 3.5 of the "Gene-Hull Sailboat 3.2_Formulations_2021 09" document?
I'm currently working on a macro in FreeCAD to generate parametric shells.

 

Great your modelling with Free Cad , and happy that Gene-Hull could contribute to your works.
I have not done yet an update 3.5 of the formulations doc but ok, if these info are helpful for you, I will do

 

Core formulations within Gene-Hull 3.5 :
** I started with the sections formulation, here attached with also a file for you to do tests with a simple spreadsheet.
** Next documents will adressed the Keel line formulation and the Sheer line formulation.
** The combination of these 3 formulations giving a full geometrical definition of the hull body.

 

Here attached is the document about the Keel line formulation with also an .ods file for you to do tests.
Formulations look complicated but actually they are just polynomes a bit cooked to offer a wide variety of shape for the keel line.
And these formulations are easy to program on a spreadsheet (like the file proposed) or with any other software tool.

Next document will be about the Sheer line formulation. As regard the keel line of a sailing dinghy, I did also another more specific formulation that will be the subject of a 4th document.

 

Here attached is the document about the Sheer line formulation with the corresponding .ods file for you to do tests.
In the introduction, I detailed my approach from the beginning of Gene-Hull to better highlight the reason of each step of complication.

So with the combination of the Keel line, the Sheer line and the Sections formulations, you can generate the full geometrical definition and drawing of the hull body, with the Gene-Hull application and/or you can build a macro with another software tool.

My next document will be for the keel line formulation of a sailing dinghy, to better comply with both the archimedian and the planing modes.

 

Here attached is the document about the formulation proposed for the keel line of a sailing dinghy, as implemented within Gene-Hull Dinghy 3.1. And also attached is the corresponding .ods file for you to do tests.

In the introduction, I detailed the rationale : in short, the guiding idea is to gradually reduce the keel line curvature from front to aft, up to aiming a curvature equal zero at the transom. So, the more the planing mode develops and the trim increases, the lower the curvature of the hull bottom still in contact with the water.