LEGO Rocket Launcher - Part 1

I started this project many years ago. I was inspired by usb gadgets firing foam rockets.
I though to build my rocket launcher using Lego and control it using pc’s usb port (or modded Dockstar’s usb port).

I developed the project using Lego Digital Designer software, free downloadable from Lego web site.The LDD library has a large set of bricks and you can choose all needed components.When a first version is ready you must review your schema to minimize the number and the type of bricks. Below, the latest optimized schema.

I bought a couple of complete set from Lego as base kit (Lego 9391 and Lego 8293) and missing bricks and parts from ebay. When building the real lego model I did some changes to the schema. 

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