Recent content by Remmlinger

I have written a new update for my VPP UliSail_3.8. It calculates the equilibrium for all 6 degrees of freedom (DOF). The negative impact on speed of a badly balanced boat is clearly visible. You can also investigate now the impact of mast rake and of different rudder arrangements, like single...

We discussed almost the same topic in this old thread. New Lines Prediction Program https://www.boatdesign.net/threads/new-lines-prediction-program.45601/

If you want to design a hull, based on mathematical modelling, you could use UliLines: Hull form generation with UliLines https://www.remmlinger.com/UliLines.html

Since I keep getting requests from RC-model builders, I developed the update UliSpeed_2.10 that can also predict the speed of model sailboats. An example of an IOM-class boat is contained in the downloads.

I have published new updates for my program UliSail: 3D Sail aerodynamics with UliSail https://www.remmlinger.com/3D%20Sail%20aerodynamics.html and also for my VPP UliSpeed: Velocity Prediction Program (VPP) UliSpeed https://www.remmlinger.com/UliSpeed.html Both programs provide script-files to...

New update! The update UliSpeed_2.7 is available on my website: Velocity Prediction Program UliSpeed https://www.remmlinger.com/UliSpeed.html After you have finished the optimization, the program will write now scripting files that can be read by the CAD-programs RHINO or DELFTship. The...

A first source is always Hoerner's Fluid Dynamic Drag: https://ia600707.us.archive.org/13/items/FluidDynamicDragHoerner1965/Fluid-dynamic_drag__Hoerner__1965_text.pdf Chapter V

Following your description, it seems that there is no DIY-solution. The tolerance should be 2 mm max. There are engineering companies, especially in the architectural business, which offer a scan and the conversion into a CAD-file (IGES) that has the required accuracy. Their service might be...

I am interested in your 3D-scan. Which hull did you scan? Any hull, where the lines plan is published by the class-society (e.g. H-boat) can be used for your validation. Are you able to import your scan into Rhino and create smooth surfaces? Regards, Uli

Concerning Catamarans Leo Lazauskas used thin ship theory to calculate the interference between the two hulls of a catamaran: Michlet 9.33 Released https://www.boatdesign.net/threads/michlet-9-33-released.52865/ Unfortunately he lost interest in ship design and his website is down. The...

There is a new update, which can be downloaded at Velocity Prediction Program UliSpeed https://www.remmlinger.com/UliSpeed.html The update contains several bug-fixes and new features. The program can handle now ballast bulbs, twin rudders, and arbitrary longitudinal trim by shifting weights.

Sorry, no, it can not simulate catamarans. Maybe I can find the time in the future to adapt the program for catamarans. Thanks for your interest Uli

Thank you, Jean-Francois, for your interest in my work! The influence of the sea state, like you describe it, is indeed extremely difficult to assess. I used the simplified version of the latest Delft-coefficients, that you discussed some time ago in a thread. It is better than nothing :-).

I have followed Mikko's request and updated the program. The additional integrated coefficients can be found in the OUT-file. You can download version 1.4 from my website: Velocity Prediction Program UliSpeed https://www.remmlinger.com/UliSpeed.html