More ideas from Raul
Air Command Water Rockets - Building a water rocket launcher

Australian water rockets built out of common items found around the house. Includes construction details and practical advice.

a three-pendulum rotary harmonograph

Not really sure why youo'de want to build one of these except for artsy fartsy drawings, but here are some DIY plans - a three-pendulum rotary harmonograph

How to Make a Three Pendulum Rotary Harmonograph via www.wikiHow.com

Not really sure why youo'de want to build one of these except for artsy fartsy drawings, but here are some DIY plans - a three-pendulum rotary harmonograph

Fran McConville's Harmonograph Page

Harmonograph interesting looking project looks simple enough to replicate, good luck to all who want to give it a try