Listed below are the links to the pages on the subject of boats.
Choose the subject you are interested in and click on the appropriate link.
These are foam collars that can be attached t aluminum dinghies to provide stabilisation and make them practically unsinkable. The links to the pages/books, “Gluing the Kapten Collars”, with instructions are as follows:
The free version:
or purchase the full version with details of materials required and more in depth instructions for $4.82USD.