Once the bottle is empty of water, its flight starts to slow. If the rocket doesn't fly at all, check two things: Is water escaping from the bottle? Look around the cork to check if it's sealing ...

Once the bottle is empty of water, its flight starts to slow. If the rocket doesn't fly at all, check two things: Is water escaping from the bottle? Look around the cork to check if it's sealing ...

[Mr. Hart] wanted a quick and easy way to safely launch air-water rockets and came up with a pretty clever system. The core task is to pump air into the partially filled water bottle and then ...