There are different ways to eject parachutes from water rockets. The technique we like to use is called Side Deployment (aka Horizontal Deployment) where the parachute is deployed in a perpendicular direction to the rocket body axis. The other common technique is to separate the nosecone and have the parachute come out in-line with the rocket axis. This is how most amateur pyro rockets do it.
We use the side deployment technique because we often have a camera and altimeter mounted in the nosecone. Having them rigidly attached to the rocket body gives them a more stable platform on the way down.
There are a lot of different ways to achieve side deployment as well. We like to construct ours so that the outer aero-shell is separate from the actual mechanism itself. This makes construction and adjustment much easier. It also allows the mechanism to be easily reused if the aero-shell becomes damaged.
The procedure below outlines the general steps of how we construct ours. No specific dimensions are given here as these will depend on the bottles you use and how much space you want to allocate for the parachute. Materials
- Corriflute (Coroplast, Twinplast, Correx ) corrugated plastic sheet
- 2 PET bottles
- 2 rubber bands
- Paper clip
- Skewer stick
- Ping pong ball
- Timer (Tomy timer, flight computer etc.)Tools
- Contact glue
- Craft knife
- Long nose pliers
More water rocket instructions such as these can be found at our main website:www.AirCommandRockets.com