Rinse an empty plastic bottle and let dry. Tighten the lid well to prevent any water from getting inside the boat!
Hull: Draw guide lines to cut along and make an opening in the top of the bottle. Leave a piece in place across the middle of the cockpit, where you will attach the mast. (Alternatively, you can glue a piece to the bottom of the boat.)
Mast: Cut a dowel to an appropriate height relative to the size of the boat. Remember: if your mast is too tall or if your sail is too big, your boat might capsize. Cut an X into the piece crossing the cockpit, poke in the mast and glue it to the bottom of the boat.
Sail: Decorate a piece of hobby card with colourful tape, stickers or waterproof paint. Hobby card can handle a few splashes of water and the occasional capsizing, and it is easy to replace as needed. Cut out a curved sail, like a spinnaker, and then cut a small, horizontal notch into the top.
Thread the sail onto the mast and glue it in place, about 3 cm down the mast. Bend in the lower part of the sail and press it towards the gunwale of the boat. Make a flag for the mast out of a piece of tape and attach it around the dowel. Cut a notch into the end of the flag to give it two points.
Christen your boat and set sail on the North Sea.
Ships ahoy! It's time to get crafty and creative with rubbish! Turn an old plastic bottle into a sailboat, ready to set sail for adventures on a lake, river or bathtub. If you want to take your boat-building to the next level, you can also cut out a piece of plastic to make a keel and glue it to the underside of the boat. Tip! Place a few stones in the bottom of the boat to prevent it from capsizing.