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Concentric Port Calculator

Input the size of the small tube and the wall thicknesses and it does the rest.
Play around with different wall sizes to arrive at the sizes you want.
If you are unable to source a pipe of a particular size, you can make it out of 2 layers of PVC pipe.
The software has an extra utility which will help you to work out how much to cut out.

Screenshot of Concentric port calculator

Features of current version - V1.6

 

Click the image to download Sonosub
Concentric.exe is written in Visual Basic 6 and runs under Windows. Filesize 65,536 bytes
If you don't have them installed, you may need to grab the VB6 Runtimes - Windows XP already has them.

 

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You can help to improve this site - use the feature request page to suggest changes to content or navigation.      Last update to this page 18th April 2009