What a balloon helicopter is
A balloon helicopter is a toy or simple science project made from a balloon, a straw, and a small propeller. When you release the air from the balloon, it pushes on the air and makes the propeller spin and the helicopter rise a little.
What parts you usually use
- Balloon — filled with air.
- Straw — acts as a tube for the air to push the propeller.
- Propeller — a small plastic blade that spins around when air blows on it.
- Thread or string (optional) — helps hang or guide the helicopter.
How it works, step by step
- Put the straw through the neck of the balloon so the balloon can blow air out of the straw.
- Attach the propeller to the end of the straw. The propeller should be able to spin freely.
- Hold the straw so that the air from the balloon will blow straight onto the propeller.
- When you release or let the air out, the fast-moving air hits the propeller blades. The blades spin because air pushes them around.
- The spinning propeller creates a small amount of lift and makes the toy hover or move slowly downward while spinning.
Why it lifts and spins
Air rushing out of the balloon pushes on the propeller blades. As the blades push against the air, they want to move, so the propeller spins. The spinning motion and the push from the air give a tiny lift, which makes the helicopter rise a bit or hover for a moment.
Things to try safely
- Change the size of the balloon and see if the propeller spins faster.
- Try different propeller blade shapes or numbers to see how it changes speed.
- Keep hands away from the spinning blade.
Big-picture takeaway
A balloon helicopter works because air movement from a balloon can spin a propeller. The spinning propeller and the push of air create motion and a small lift, letting the toy rise a little and rotate as it descends.