Here is how to make a LOUD whistle from a soda can
Step 1: Supplies
All you need is a pair of scissors and a soda can
Step 2: Cutting the Can
Cut the top and bottom off of the can. Then cut a line right down it You should have a sheet of aluminum. Cut a 3/4 of an inch by 2 inch and a another 1/2 of an inch by 1 1/2 inch out of the sheet. After that you should have a lot left over.
Step 3: Folding
Put the small piece of aluminum on top of the big piece it should look like a cross shape. Bend the smaller piece around the bigger piece. Then bend the bigger piece 1/4 of an inch over the smaller piece. bend the end of the big piece to a right angle. Bend the excess piece into a p shape that lines up where the air escapes after blowing through the mouth piece.
Step 4: Using
Be for you using it for the first time stick sum kind of a wedge in it to make the mouth hole bigger. Hold the loop with thumb and index finger and then blow like a normal whistle.
If it will not work make sure that the mouth peace is lined up with the loop.