Step 5:How to make a simple water rocket

After creating the top, create 6 incisions using the Exacto knife, spread equally apart, around the top part of the cone. Then cut each elastic band so they are straight lines. Slide the rubber bands through the incisions. The first one through the first incision, and through the incision across from it; the second one through the second incision, and through the incision across from that; the third through the third incision, and through the incision across from that.

Pull both sides of the elastics up over the top of the bottle and screw on the top to hold in place.

An asterisk should appear in the inside of the top of your cone.