This mechanism was developed to provide automatic staging of multi-stage water rockets. This mechanism will release a sustainer with a standard 9mm Gardena nozzle when the booster stops producing thrust.
The following tutorial describes how to build the staging mechanism. It should be used more as a guide rather than an exact step-by-step procedure as it is likely you will not have access to the identical parts used here. Feel free to substitute components as you see fit.
NOTE: Read the tutorial carefully including the notes at the end as there are important bits of information that you will need.
- 5mm Clear vinyl tubing (or similar) :
- 1 x Gardena quick connector
- 3 x springs from 3 other Gardena quick connectors
- 2 x plastic pen tips
- 2 x pins
- 1 x bottle cap
- length of wire
- length of T8 FTC tubing (70mm & 35mm) (or similar size tube)
Example: (https://www.1000bulbs.com/product/242/PLAS-100269.html )
- Electrical tape
- Epoxy glue
- Drill and 5mm drill bit (drill bit needs to match tubing OD)
- Craft knife
Make sure that the Gardena quick connector you are using will not slide into the FTC. There is a flange on the quick connector just behind the thread. The flange diameter should be bigger than the FTC diameter. Some cheaper brand quick connectors are slightly narrower and could potentially slip inside the FTC.