The bottle must be made entirely of plastic ... If no, make sure the valve can open to let air through from the pump. It may be damaged or screwed shut. If the rocket does fly but not very ...

The staggered tongues that are left after cutting along this line make ... bottle that makes up the body of the rocket. The rubber band wraps around the outside of the chassis, holding those ...

Here's how to fire a plastic pot metres into ... is similar to what propels Water Bottle Rockets upwards. Yan has made an activity guide to show you how to make those as well.

Then, hot gases, flames and smoke explode from the rocket ... hold the bottle up. Its opening should not touch the ground when it is upside down. Pour the vinegar into the plastic bottle until ...