Make a whistle from bottle-tops.

Step 2: Drilling and ripping

Drill a hole in one of the caps, somewhat off-centre.

Inside the cap, rip out the lining of the cap from around the hole - this makes the edge of the hole thinner, and better at splitting the air.

Comments

[poza]

mine isn't working - what size hole did you drill here? i noticed the side hole is 3mm, but you don't mention the size of the top hole.

also, i wonder if the size of the straw matters - both width AND length.

once i get this to work, i was thinking of trying two peanut butter lids and a barrel from an ink pen.

[NinjaBoy12]

i had to make a really big hole for it to work
just try making a hole then blowing over it if it doesnt sund make it bigger

[Kiteman]

The whistle is very sensitive to the precise angle the air hits the edge of the hole, and I found that it worked better when I slightly flattened the straw.

[dragonmamath]

Awesome!

[Kiteman]

Thank you!