I'm still an amateur on water rockets. I got here caus I was searching a place to share the launching system I got from my uncle.
It started a few years ago (I think it was 2006) when were having a birthday party with the family. It was a sunny day and the little causins and nieces were propably having fun till one or more got hurt and started crying. Enyhow, I got the idea of trying water rockets. Our first launcher was nothing more but a water bottle an air pump trough a cork and a carton pipe to guide the rocket.
As I explained before, my uncle then built this launcher for us and now, as new year present, I also got one.
I think I'll find out how to modify the plastic or PET bottles to make them more aerodynamic and stable. Caus plain bottles don't fly that well. Our garden might not be the optimal location for shooting these rockets though, they often land at the neighbours garden

Cheers