Copyright © 2001 - 2015 by B. Kohler All rights reserved
QUICK PERFORMANCE CHECK
Shows the maximum speed of the boat at different wind speeds in graphical form till 90 degree to the wind.
With this program you can check the basic (medium) speed, 24 hour distance sailed, wind pressure when a hull wants to lift. You can compare 5 boats in one go. The results are shown in a table.
DYNAMIC STABILITY PROGRAM
This program shows the righting moment as graphic. Change the wind speed and see how the stability curve changes.
These programs are written in power-basic and run under DOS. Hereby I give them free for downloading. Now you can check for your self what you can expect from your multihull. These are all .EXE files. Load them down on a diskette and you can run them direct under DOS. You need the KDD text to understand the use of the programs. This is a zip file.
Anti vortex panels
(sort of winglets) are an other effective way to reduce leeway on a catamaran.
There advantage are, no moving parts, no increase of the draft of the craft. We use them on our catamaran "Pelican". The article explains the theory how they work.
To download article click on the picture
For a better understanding of the anti vortex article, load down the article how boards & rudders work, where I explain how lift is generated
To down load article click on the picture
* The programs run under DOS. Load the DOS BOX and the programs run under any
operation system. Link: http://www.dosbox.com/information.php?page=0
Many cruising multihull owner are disappointed in performance of there boats because of excessive claims by clever sales people. Years ago, I wrote these programs for my own design work, to predict the speed and calculate the stability of multihulls ( special catamaran's ). They are probably unique in their field and now available as free downloads. These programs are written in Power-Basic and run under DOS. Now you can check for your self what you can expect from your multihull. These are all .EXE files. Load them down and you can run them direct under DOS. You need the KDD text to make full use of the programs.
To be able to use the programs you need a DOS emulator. Click on the box to go to download. By the way if you like old games this is the way to go.