Rain-gutter Regatta Sail

Here's the sail my son and I made for this year's Cub Scout's rain gutter regatta. Together with an extremely light boat build, he won every race by a fairly large margin.

This key design goal of this project was to use the vase print function in Cura to build an extremely light sail that required no extra supports. Our pack rules allow for only one attachment point to the deck and a minimum of 1/4 inch clearance from the sail to any other surface. By utilizing a ridged sail, we shortened the mast to ~3/8 of an inch and kept the center of mass very low in the boat. This resulted in a very light boat the resisted tipping.

PETG was chosen since we knew it was going to be beat around and needed to be somewhat flexible. It's easily trim-able with a sharp pair of scissors. Attachment was made with hot glue.

The last two years, we've used a vacuum molding machine we made to create sails for the boats using old milk jugs. Those sails were much lighter, but more flexible. I