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Indoor activity

Clothespin Sailboat

Clip clothespins together to make a hull, add a popsicle-stick mast and paper sail, then race your boat across a tub of water!

Ages 3-10 0-1 hours Education 6/10

Materials

  • Clothespins
  • Large Bowl
  • Markers
  • Paper
  • Popsicle Sticks
  • PVA Glue

Illustrated Steps

1

Build the Hull

Clip three clothespins side by side onto a popsicle stick to form a stable raft hull.

2

Make the Mast

Push a popsicle stick vertically into the middle clothespin to create a tall mast.

3

Create the Sail

Cut a paper sail, poke holes, thread it onto the mast, and decorate with markers!

4

Launch and Race

Float your sailboat on water and blow the sail to race it across!

What You’ll Create

A boat that really floats! ⛵ Your little shipbuilders will clip clothespins together to form a sturdy hull, insert a popsicle stick mast, and attach a colourful paper sail. Then launch it in a bowl, sink, or paddling pool and blow it across the water. Will it sail straight or spin in circles? Only one way to find out!

Have fun!

  • 🏴‍☠️ Make a pirate flag sail with a skull and crossbones drawn in marker!
  • 🌬️ Experiment — does a bigger sail make the boat go faster or tip over?
  • 🎨 Paint the clothespins in bright colours before building for a rainbow fleet!
  • 📐 Try different hull designs — four clothespins, two clothespins — which is most stable?

Why It’s Amazing

  • Buoyancy Basics: Testing whether the boat floats, tips, or sinks introduces Archimedes’ principle in the most hands-on way possible. ⚓

  • Engineering Design: Balancing the mast height, sail size, and hull width teaches structural trade-offs — real naval architecture in miniature! 🔬

  • Wind Power: Blowing the sail and watching the boat move demonstrates how wind energy converts to kinetic energy. 💨

  • Fine Motor Skills: Clipping clothespins, threading sails, and balancing components all build hand strength and dexterity. ✋

Pro Tips

For ages 3–5: Pre-assemble the hull and mast. Let them decorate the sail with markers and help launch the boat. Blowing the boat across water is the best part!

For ages 5–8: Let them build the full boat themselves. Challenge them to make the boat sail in a straight line — adjusting the sail angle teaches basic aerodynamics.

For ages 8–12: Run a proper regatta! Build boats with different sail shapes (square, triangular, tall, short) and test which design is fastest. Record results and discuss why some designs work better. Add a rudder from a small piece of cardboard taped to the back.

Secret Pro Move: Add a small blob of modelling clay or a coin to the bottom of the hull as ballast — this lowers the centre of gravity and stops the boat from tipping over in the wind! 🎯