This water rocket launcher ... That bottle could use some fins and a nose cone but there’s no denying the delight the kids are enjoying when they chase after the downed craft.

This piece of engineering is so simple and elegant, you’ll want to build a pretty serious water rocket ... the bottle. The staggered tongues that are left after cutting along this line make ...

Download the Water ... bottle? Look for air bubbles in the water when you pump. If no, make sure the valve can open to let air through from the pump. It may be damaged or screwed shut. If the ...

Download the Water ... bottle? Look for air bubbles in the water when you pump. If no, make sure the valve can open to let air through from the pump. It may be damaged or screwed shut. If the ...