A nice and small project for this summer: constructing and launching world's largest water rocket.
The plan is to give the rocket a volume of over 400 litres (about 105 gallons), and will consist of 21 massive water cooler bottles.
The rocket will have a length of about 4 metres and will propel it's 140 litres of water in around a second.

Currently we're busy with the Water Rocket Car project, where we'll got some more experienced with the water cooler bottles.
We'll start on this project around spring of 2010.